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  1. Nicaragua: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    imported 63.95 million kWh from its neighbours Panama and Honduras.Nicaragua has no oil production; in 2001, its consumption was of 24,500 bblday. There is one oil refinery...

  2. Nicaragua-San Jacinto-Tizate Geothermal Power Project | Open...

    Open Energy Info (EERE)

    Website http:www.iadb.orgprojectsP Program Start 2010 Country Nicaragua UN Region Latin America and the Caribbean References Nicaragua-Geothermal1 Background "The Project...

  3. A New Geothermal Anomaly In Nicaragua | Open Energy Information

    Open Energy Info (EERE)

    Geothermal Anomaly In Nicaragua Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: A New Geothermal Anomaly In Nicaragua Abstract The information...

  4. Nicaragua-IAEA Cooperation | Open Energy Information

    Open Energy Info (EERE)

    IAEA Cooperation Jump to: navigation, search Name Nicaragua-IAEA Cooperation AgencyCompany Organization International Atomic Energy Agency Sector Energy Topics Background...

  5. The Panama Canal: It's all about connectivity

    U.S. Energy Information Administration (EIA) Indexed Site

    Panama Canal: It's all about connectivity Panama at a glance GDP growth rate - last 10 years 7.5% GDP estimated- 2013 (dollars) 38,6b GDP per capita - 2013 estimated (in dollars) 13,032 Population (million) 3.5 Unemployment rate (in %) 4.0 Inflation rate - 2013 (in %) 4.08 It's all about Connectivity * 144 trade routes * 1,700 ports * 160 countries The Panama Canal's value added service The Panama Canal Service Package Reliability Sustainability Connectivity Economies of Scale * Opens 24 hours a

  6. Panama: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    Country Profile Name Panama Population 3,608,431 GDP 49,142,000,000 Energy Consumption 0.24 Quadrillion Btu 2-letter ISO code PA 3-letter ISO code PAN Numeric ISO...

  7. Integrated: Geospatial Toolkit GIS data for Nicaragua from NREL...

    Open Energy Info (EERE)

    Nicaragua from NREL (Abstract): Geographic Information Systems (GIS) data intended for use in the Geospatial toolkit or with any GIS software. (Purpose): The Solar and Wind Energy...

  8. Panama Begins Radiation Detection Efforts at Two Ports | National...

    National Nuclear Security Administration (NNSA)

    "We are working closely with the Panamanian National Customs Authority and with the private terminal operators in Panama to prevent nuclear terrorism and the proliferation of ...

  9. Gateway:América Latina | Open Energy Information

    Open Energy Info (EERE)

    Haiti Haiti Honduras Honduras Mexico Mexico Nicaragua Nicaragua Panama Panama Paraguay Paraguay Peru Peru Republica Dominicana Dominican Republic Uruguay Uruguay Venezuela...

  10. EPA-GHG Inventory Targeted Data Collection Strategies and Software...

    Open Energy Info (EERE)

    inventorycapacitybuildingswtoo Country: Nicaragua, Panama, Guatemala, Costa Rica, El Salvador, Honduras, Belize Cost: Free Central America, Central America, Central America,...

  11. Second Line of Defense Megaports Initiative Operational Testing and Evaluation Plan Colon Container Terminal (CCT) Panama

    SciTech Connect (OSTI)

    Newhouse, Robert N.

    2010-01-01

    Report on the Operational Testing and Evaluation to validate and baseline an operable system that meets the Second Line of Defense (SLD) mission requirements. An SLD system is defined as the detection technology and associated equipment, the system operators from the host country, the standard operating procedures (SOPs), and other elements such as training and maintenance which support long-term system sustainment. To this end, the activities conducted during the OT&E phase must demonstrate that the Megaports System can be operated effectively in real-time by Panama Direccion General de Aduanas (DGA Panama Customs) personnel to the standards of the U.S. Department of Energy/National Nuclear Security Administration (DOE/NNSA).

  12. The Momotombo Geothermal Field, Nicaragua: Exploration and development case history study

    SciTech Connect (OSTI)

    1982-07-01

    This case history discusses the exploration methods used at the Momotombo Geothermal Field in western Nicaragua, and evaluates their contributions to the development of the geothermal field models. Subsequent reservoir engineering has not been synthesized or evaluated. A geothermal exploration program was started in Nicaragua in 1966 to discover and delineate potential geothermal reservoirs in western Nicaragua. Exploration began at the Momotombo field in 1970 using geological, geochemical, and geophysical methods. A regional study of thermal manifestations was undertaken and the area on the southern flank of Volcan Momotombo was chosen for more detailed investigation. Subsequent exploration by various consultants produced a number of geotechnical reports on the geology, geophysics, and geochemistry of the field as well as describing production well drilling. Geological investigations at Momotombo included photogeology, field mapping, binocular microscope examination of cuttings, and drillhole correlations. Among the geophysical techniques used to investigate the field sub-structure were: Schlumberger and electromagnetic soundings, dipole mapping and audio-magnetotelluric surveys, gravity and magnetic measurements, frequency domain soundings, self-potential surveys, and subsurface temperature determinations. The geochemical program analyzed the thermal fluids of the surface and in the wells. This report presents the description and results of exploration methods used during the investigative stages of the Momotombo Geothermal Field. A conceptual model of the geothermal field was drawn from the information available at each exploration phase. The exploration methods have been evaluated with respect to their contributions to the understanding of the field and their utilization in planning further development. Our principal finding is that data developed at each stage were not sufficiently integrated to guide further work at the field, causing inefficient use of

  13. A reservoir engineering assessment of the San Jacinto-Tizate geothermal field, Nicaragua

    SciTech Connect (OSTI)

    Ostapenko, S.; Spektor, S.; Davila, H.; Porras, E.; Perez, M.

    1996-12-31

    More than twenty years have passed since geothermal research and drilling took place at the geothermal fields in Nicaragua. The well known Momotombo Geothermal Field (70 MWe) has been generating electricity since 1983, and now a new geothermal field is under exploration, the San Jacinto-Tizate. Two reservoirs hydraulic connected were found. The shallow reservoir (270{degrees}C) at the depth of 550 - 1200 meters, and the deep one at > 1600 meters. Both of them are water dominated reservoirs although a two phase condition exist in the upper part of the shallow one. Different transient tests and a multi-well interference test have been carried out, very high transmissivity value were estimated around the well SJ-4 and average values for the others. A preliminary conceptual model of the geothermal system is given in this paper, as the result of the geology, geophysics, hydrology studies, drilling and reservoir evaluation.

  14. A reservoir engineering assessment of the San Jacinto-Tizate Geothermal Field, Nicaragua

    SciTech Connect (OSTI)

    Ostapenko, S.; Spektor, S.; Davila, H.; Porras, E.; Perez, M.

    1996-01-24

    More than twenty yews have passed since geothermal research and drilling took place at the geothermal fields in Nicaragua- Tbe well horn Momotombo Geothermal Field (70 We) has been generating electricity since 1983, and now a new geothermal field is under exploration. the San Jacinto-Tizate. Two reservoirs hydraulic connected were found. The shallow reservoir (270°C) at the depth of 550 - 1200 meters, and the deep one at > 1600 meters. Both of theme are water dominated reservoirs, although a two phase condition exist in the upper part of the shallow one. Different transient tests and a multi-well interference test have been carried out, very high transmissivity value were estimated around the well SJ-4 and average values for the others. A preliminar conceptual model of the geothermal system is given in this paper, as the result of the geology, geophysics, hydrology studies, drilling and reservoir evaluation.

  15. Landfill Energy Systems LES | Open Energy Information

    Open Energy Info (EERE)

    Energy Systems LES Jump to: navigation, search Name: Landfill Energy Systems (LES) Place: Michigan Zip: 48393 Product: Landfill gas to energy systems project developer, gas...

  16. --No Title--

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Nicaragua Niger Nigeria Niue Norway Oman Pakistan Palestine Panama Papua New Guinea Paraguay Peru Philippines Poland Portugal Puerto Rico Qatar Reunion Romania Russia Rwanda...

  17. Forest Carbon Partnership Facility | Open Energy Information

    Open Energy Info (EERE)

    Madagascar, Mexico, Moldova, Mozambique, Nepal, Nicaragua, Panama, Papua New Guinea, Paraguay, Peru, Republic of the Congo, Suriname, Tanzania, Thailand, Uganda, Vanuatu, Vietnam...

  18. --No Title--

    Gasoline and Diesel Fuel Update (EIA)

    New Zealand Nicaragua Niger Nigeria Niue Norway Oman Pakistan Palestine Panama Papua New Guinea Paraguay Peru Philippines Poland Portugal Puerto Rico Qatar Reunion Romania ...

  19. UNITED STATES OF AMERICA DEPARTMENT OF ENERGY OFFICE OF FOSSIL...

    Energy Savers [EERE]

    ... Jordan, Mexico, Morocco, Nicaragua, Oman, Panama, Peru, Republic of Korea, and Singapore. ... at issue here; and (ii) the Alaska North Slope, with natural gas derived from the ...

  20. Christopher Smith Principal Deputy Assistant Secretary Office...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    El Salvador, Guatemala, Honduras, Jordan, Mexico, Morocco, Nicaragua, Oman, Panama, Peru, Republic of Korea, and Singapore. There also are two countries - Israel and Costa Rica...

  1. DOE/EA-1976 FINDING OF NO SIGNIFICANT IMPACT FOR PROPOSED CNG...

    Broader source: Energy.gov (indexed) [DOE]

    Bahrain, Canada, Chile, Colombia, Dominican Republic, El Salvador, Guatemala, Honduras, Jordan, Mexico, Morocco, Nicaragua, Oman, Panama, Peru, Republic of Korea, and Singapore. ...

  2. DOE/EA-1976 FINDING OF NO SIGNIFICANT IMPACT FOR PROPOSED CNG...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ... Morocco, Nicaragua, Oman, Panama, Peru, Republic of Korea, and Singapore. FTAs with Israel and Costa Rica do not require national treatment for trade in natural gas. 2 Section ...

  3. USAID Central America and Mexico Regional Climate Program (E...

    Open Energy Info (EERE)

    analysis Website http:www.usaid.govourwork Country Mexico, Guatemala, El Salvador, Nicaragua, Belize, Costa Rica, Panama, Honduras Central America, Central America,...

  4. How to Obtain Authorization to Import and/or Export Natural Gas...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    natural gas with Australia, Bahrain, Canada, Chile, Colombia, Dominican Republic, El Salvador, Guatemala, Honduras, Jordan, Mexico, Morocco, Nicaragua, Oman, Panama, Peru,...

  5. The scaling relationship between self-potential and fluid flow on Masaya volcano, Nicaragua

    SciTech Connect (OSTI)

    Lewicki, J.L.; Hilley, G.E.; Conner, C.

    2003-11-11

    The concurrent measurement of self-potential (SP) and soil CO{sub 2} flux (F{sub s}{sup CO2}) in volcanic systems may be an important tool to monitor intrusive activity and understand interaction between magmatic and groundwater systems. However, quantitative relationships between these parameters must be established to apply them toward understanding processes operating at depth. Power-law scaling exponents calculated for SP and F{sub s}{sup CO2} measured along a fault on the flanks of Masaya volcano, Nicaragua indicate a nonlinear relationship between these parameters. Scaling exponents suggest that there is a declining increase in SP with a given increase in F{sub s}{sup CO2}, until a threshold (log F{sub s}{sup CO2} {approx} 2.5 g m{sup -2}d{sup -1}) above which SP remains constant with increasing F{sub s}{sup CO2}. Implications for subsurface processes that may influence SP at Masaya are discussed.

  6. Self-potential, soil co2 flux, and temperature on masaya volcano, nicaragua

    SciTech Connect (OSTI)

    Lewicki, J.L.; Connor, C.; St-Amand, K.; Stix, J.; Spinner, W.

    2003-07-01

    We investigate the spatial relationship between self-potential (SP), soil CO{sub 2} flux, and temperature and the mechanisms that produce SP anomalies on the flanks of Masaya volcano, Nicaragua. We measured SP, soil CO{sub 2} fluxes (<1 to 5.0 x 10{sup 4} g m{sup -2} d{sup -1}), and temperatures (26 to 80 C) within an area surrounding a normal fault, adjacent to Comalito cinder cone (2002-2003). These variables are well spatially correlated. Wavelengths of SP anomalies are {le}100 m, and high horizontal SP gradients flank the region of elevated flux and temperature. Carbon isotopic compositions of soil CO{sub 2} ({delta}{sup 13}C = -3.3 to -1.1{per_thousand}) indicate a deep gas origin. Given the presence of a deep water table (100 to 150 m), high gas flow rates, and subsurface temperatures above liquid boiling points, we suggest that rapid fluid disruption is primarily responsible for positive SP anomalies here. Concurrent measurement of SP, soil CO{sub 2} flux, and temperature may be a useful tool to monitor intrusive activity.

  7. Large Eddy Simulation (LES) of Engines

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Engine Combustion/Modeling/Large Eddy Simulation (LES) of Engines Large Eddy Simulation (LES) of Engines admin 2015-10-28T02:19:26+00:00 LES-SN-LES-Eng-Combustion-Modeling-2 The combination of High Performance Computing (HPC) and the Large Eddy Simulation (LES) technique has significant potential to provide new insights into the dynamics of IC-engine flow processes. At the CRF, we integrate the combined merits of HPC and LES in a manner that provides some of the highest-fidelity, most detailed

  8. Comparative soil CO2 flux measurements and geostatisticalestimation methods on masaya volcano, nicaragua

    SciTech Connect (OSTI)

    Lewicki, J.L.; Bergfeld, D.; Cardellini, C.; Chiodini, G.; Granieri, D.; Varley, N.; Werner, C.

    2004-04-27

    We present a comparative study of soil CO{sub 2} flux (F{sub CO2}) measured by five groups (Groups 1-5) at the IAVCEI-CCVG Eighth Workshop on Volcanic Gases on Masaya volcano, Nicaragua. Groups 1-5 measured F{sub CO2} using the accumulation chamber method at 5-m spacing within a 900 m{sup 2} grid during a morning (AM) period. These measurements were repeated by Groups 1-3 during an afternoon (PM) period. All measured F{sub CO2} ranged from 218 to 14,719 g m{sup -2}d{sup -1}. Arithmetic means and associated CO{sub 2} emission rate estimates for the AM data sets varied between groups by {+-}22%. The variability of the five measurements made at each grid point ranged from {+-}5 to 167% and increased with the arithmetic mean. Based on a comparison of measurements made by Groups 1-3 during AM and PM times, this variability is likely due in large part to natural temporal variability of gas flow, rather than to measurement error. We compared six geostatistical methods (arithmetic and minimum variance unbiased estimator means of uninterpolated data, and arithmetic means of data interpolated by the multiquadric radial basis function, ordinary kriging, multi-Gaussian kriging, and sequential Gaussian simulation methods) to estimate the mean and associated CO{sub 2} emission rate of one data set and to map the spatial F{sub CO2} distribution. While the CO{sub 2} emission rates estimated using the different techniques only varied by {+-}1.1%, the F{sub CO2} maps showed important differences. We suggest that the sequential Gaussian simulation method yields the most realistic representation of the spatial distribution of F{sub CO2} and is most appropriate for volcano monitoring applications.

  9. Large Eddy Simulation (LES) of Engines

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Reacting Flow/Modeling/Large Eddy Simulation (LES) of Engines Large Eddy Simulation (LES) of Engines admin 2015-10-30T01:57:44+00:00 The combination of high-performance computing (HPC) and the large eddy simulation (LES) technique has significant potential to provide new insights into the dynamics of many types of turbulent combustion processes. The objective of LES development at the CRF is to fully integrate the combined merits of HPC and LES in a manner that provides some of the

  10. Large Eddy Simulation (LES) of Engines

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Reacting FlowModelingLarge Eddy Simulation (LES) of ... The integrated set of tasks provides an optimal combination ... models for a variety of propulsion and power devices

  11. Large Eddy Simulation (LES) Applied to Advanced Engine Combustion...

    Broader source: Energy.gov (indexed) [DOE]

    Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel Engine Combustion Research Vehicle ...

  12. Sandia Energy - Large Eddy Simulation (LES) of Engines

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Large Eddy Simulation (LES) of Engines Home Transportation Energy Predictive Simulation of Engines Engine Combustion Modeling Large Eddy Simulation (LES) of Engines Large Eddy...

  13. Long-term assessment of the oil spill at Bahia Las Minas, Panama. Interim report. Volume 1: Executive summary

    SciTech Connect (OSTI)

    Keller, B.D.; Jackson, J.B.C.

    1991-10-01

    On April 27, 1986, at least 8 million liters of medium-weight crude oil spilled from a ruptured storage tank into the Bahia Las Minas on the Caribbean Coast of Panama. Coral reefs, seagrass communities, and mangroves were affected. The area of the spill was also the location of the Smithsonian Tropical Research Institute's Galeta Laboratory where resident and visiting scientists have been studying the ecology of the Bahia Las Minas and the adjacent areas for over 15 years. Because this was a unique opportunity to assess the immediate biological effects following a major spill in the Caribbean region and to monitor the subsequent recovery, the U.S. Department of the Interior Minerals Management Service supported a 5-year environmental study. The objectives of the study are to identify any long-term changes in the marine environment that may have resulted from the spill and to understand the ecological processes causing such changes. This is the first report from the study and addresses the effects observed during the first two years of the effort.

  14. Long-term assessment of the oil spill at Bahia Las Minas, Panama. Interim report. Volume 2: Technical report

    SciTech Connect (OSTI)

    Keller, B.D.; Jackson, J.B.C.

    1991-10-01

    On April 27, 1986, at least 8 million liters of medium-weight crude oil spilled from a ruptured storage tank into the Bahia Las Minas on the Caribbean Coast of Panama. Coral reefs, seagrass communities, and mangroves were affected. The area of the spill was also the location of the Smithsonian Tropical Research Institute's Galeta Laboratory where resident and visiting scientists have been studying the ecology of the Bahia Las Minas and the adjacent areas for over 15 years. Because this was a unique opportunity to assess the immediate biological effects following a major spill in the Caribbean region and to monitor the subsequent recovery, the U.S. Department of the Interior Minerals Management Service supported a 5-year environmental study. The objectives of the study are to identify any long-term changes in the marine environment that may have resulted from the spill and to understand the ecological processes causing such changes. This is the first report from the study and addresses the effects observed during the first two years of the effort.

  15. LES' URENCO-USA Facility | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    LES' URENCO-USA Facility LES' URENCO-USA Facility PowerPoint slides on LES's URENCO-USA Facility LES' URENCO-USA Facility (581.43 KB) More Documents & Publications 2014 Review of the Potential Impact of DOE Excess Uranium Inventory On the Commercial Markets Memorandum Memorializing Ex Parte Communication Report on the Effect the Low Enriched Uranium Delivered Under the Highly Enriched Uranium Agreement Between the USA and the Russian Federation has on the Domestic Uranium Mining, Conversion,

  16. Category:Latin America Region | Open Energy Information

    Open Energy Info (EERE)

    Guatemala Guyana H Haiti Honduras J Jamaica M Martinique Mexico N Nicaragua P Panama Paraguay Peru S Saint Barthlemy Saint Kitts and Nevis Saint Lucia Saint Vincent and the...

  17. LES Modeling for IC Engines | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    LES Modeling for IC Engines LES Modeling for IC Engines Large eddy simulation offers better accuracy and sensitivity to study cyclic variability, mode transition and mixing effects in engine design and operation deer12_rutland.pdf (1.36 MB) More Documents & Publications Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research Vehicle Technologies Office Merit Review 2016: Advancements in Fuel Spray and Combustion Modeling with High Performance Computing Resources

  18. Nicaragua Canal Template

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    - CHAPTER 1 This page intentionally left blank First Responder Network Authority Nationwide Public Safety Broadband Network Draft Programmatic Environmental Impact Statement for the Eastern United States VOLUME 1 - CHAPTER 1 Amanda Goebel Pereira, AICP NEPA Coordinator First Responder Network Authority U.S. Department of Commerce 12201 Sunrise Valley Dr. M/S 243 Reston, VA 20192 Cooperating Agencies Federal Communications Commission General Services Administration U.S. Department of

  19. Nicaragua Canal Template

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    - CHAPTER 2 This page intentionally left blank First Responder Network Authority Nationwide Public Safety Broadband Network Draft Programmatic Environmental Impact Statement for the Eastern United States VOLUME 1 - CHAPTER 2 Amanda Goebel Pereira, AICP NEPA Coordinator First Responder Network Authority U.S. Department of Commerce 12201 Sunrise Valley Dr. M/S 243 Reston, VA 20192 Cooperating Agencies Federal Communications Commission General Services Administration U.S. Department of

  20. Nicaragua Canal Template

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    1 This page intentionally left blank Nationwide Public Safety Broadband Network Draft Programmatic Environmental Impact Statement for the Eastern United States VOLUME 15 - CHAPTER 21 April 2016 First Responder Network Authority Amanda Goebel Pereira, AICP NEPA Coordinator First Responder Network Authority U.S. Department of Commerce 12201 Sunrise Valley Dr. M/S 243 Reston, VA 20192 Cooperating Agencies Federal Communications Commission General Services Administration U.S. Department of

  1. Nicaragua Canal Template

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    ... Canada, Mexico, Japan, and Russia. The MBTA prohibits the take, possession, import, export, transport, selling, ... floodplains and to avoid direct and indirect support of ...

  2. Nicaragua Canal Template

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    School Amanda Pereira M.S., Urban and Regional Planning, University of ... University Genevieve Walker B.A., Geology, Florida International University BOOZ ...

  3. Nicaragua Canal Template

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    ... 30 1500-100,000 -- -- 1.0 30 Source: (FCC 1996) ffrequency in MHz *Plane-wave equivalent power density 2.4.3. Overview of Research for Potential Non-Thermal Effects to Humans ...

  4. Massively Parallel LES of Azimuthal Thermo-Acoustic Instabilities...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Massively Parallel LES of Azimuthal Thermo-Acoustic Instabilities in Annular Gas Turbines Authors: Wolf, P., Staffelbach, G., Roux, A., Gicquel, L., Poinsot, T., Moureau, V. ...

  5. Using LES to Study Reacting Flows and Instabilities in Annular...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers Authors: Staffelbach, G., Wolf, P., Roux, A., Poinsot, T., Balakrishnan, R. Great prominence is ...

  6. High-quality permanent draft genome sequence of Bradyrhizobium sp. Tv2a.2, a microsymbiont of Tachigali versicolor discovered in Barro Colorado Island of Panama

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Tian, Rui; Parker, Matthew; Seshadri, Rekha; Reddy, TBK; Markowitz, Victor; Ivanova, Natalia; Pati, Amrita; Woyke, Tanja; Baeshen, Mohammed N.; Baeshen, Nabih A.; et al

    2015-05-17

    Bradyrhizobiumsp. Tv2a.2 is an aerobic, motile, Gram-negative, non-spore-forming rod that was isolated from an effective nitrogen-fixing root nodule of Tachigali versicolor collected in Barro Colorado Island of Panama. Here we describe the features of Bradyrhizobiumsp. Tv2a.2, together with high-quality permanent draft genome sequence information and annotation. The 8,496,279 bp high-quality draft genome is arranged in 87 scaffolds of 87 contigs, contains 8,109 protein-coding genes and 72 RNA-only encoding genes. In conclusion, this rhizobial genome was sequenced as part of the DOE Joint Genome Institute 2010 Genomic Encyclopedia for Bacteria and Archaea-Root Nodule Bacteria (GEBA-RNB) project.

  7. Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel...

    Broader source: Energy.gov (indexed) [DOE]

    More Documents & Publications Large Eddy Simulation (LES) Applied to LTCDieselHydrogen Engine Combustion Research Large Eddy Simulation (LES) Applied to Advanced Engine ...

  8. Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine...

    Broader source: Energy.gov (indexed) [DOE]

    More Documents & Publications Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel Engine Combustion Research Large Eddy Simulation (LES) Applied to LTCDiesel...

  9. Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    ace007oefelein2010o.pdf More Documents & Publications Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel Engine Combustion Research Large Eddy Simulation (LES)...

  10. ARM - LES ARM Symbiotic Simulation and Observation Workflow

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ThemesLES ARM Symbiotic Simulation and Observation Workflow LASSO Information LASSO Home LASSO Backgrounder Pilot Phase Begins for Routine Large-Eddy Simulations Pilot Project Timeline Presentations News Science LASSO Implementation Strategy LASSO Pilot Project Releases Related Information ARM Decadal Vision Archive of LASSO Information e-mail list Contacts William Gustafson, Lead Principal Investigator Andrew Vogelmann, Co-Principal Investigator Hanna Goss, Media Contact LES ARM Symbiotic

  11. A filtered tabulated chemistry model for LES of premixed combustion

    SciTech Connect (OSTI)

    Fiorina, B.; Auzillon, P.; Darabiha, N.; Gicquel, O.; Veynante, D.; Vicquelin, R.

    2010-03-15

    A new modeling strategy called F-TACLES (Filtered Tabulated Chemistry for Large Eddy Simulation) is developed to introduce tabulated chemistry methods in Large Eddy Simulation (LES) of turbulent premixed combustion. The objective is to recover the correct laminar flame propagation speed of the filtered flame front when subgrid scale turbulence vanishes as LES should tend toward Direct Numerical Simulation (DNS). The filtered flame structure is mapped using 1-D filtered laminar premixed flames. Closure of the filtered progress variable and the energy balance equations are carefully addressed in a fully compressible formulation. The methodology is first applied to 1-D filtered laminar flames, showing the ability of the model to recover the laminar flame speed and the correct chemical structure when the flame wrinkling is completely resolved. The model is then extended to turbulent combustion regimes by including subgrid scale wrinkling effects in the flame front propagation. Finally, preliminary tests of LES in a 3-D turbulent premixed flame are performed. (author)

  12. Massively Parallel LES of Azimuthal Thermo-Acoustic Instabilities in

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Annular Gas Turbines | Argonne Leadership Computing Facility Massively Parallel LES of Azimuthal Thermo-Acoustic Instabilities in Annular Gas Turbines Authors: Wolf, P., Staffelbach, G., Roux, A., Gicquel, L., Poinsot, T., Moureau, V. Increasingly stringent regulations and the need to tackle rising fuel prices have placed great emphasis on the design of aeronautical gas turbines, which are unfortunately more and more prone to combustion instabilities. In the particular field of annular

  13. LES Modeling of High Resolution Satellite Cloud Spatial and Thermal

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Structure at ARM-SGP site: How well can we Simulate Clouds from Space? LES Modeling of High Resolution Satellite Cloud Spatial and Thermal Structure at ARM-SGP site: How well can we Simulate Clouds from Space? Dubey, Manvendra DOE/Los Alamos National Laboratory Chylek, Petr DOE/Los Alamos National Laboratory Reisner, Jon Los Alamos National Laboratory Porch, William Los Alamos National Laboratory Category: Cloud Properties We report high fidelity observations of the spatial and thermal

  14. LES ARM Symbiotic Simulation and Observation (LASSO) Implementation Strategy

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    9 LES ARM Symbiotic Simulation and Observation (LASSO) Implementation Strategy WI Gustafson Jr. AM Vogelmann September 2015 DISCLAIMER This report was prepared as an account of work sponsored by the U.S. Government. Neither the United States nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or

  15. Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel Engine

    Broader source: Energy.gov (indexed) [DOE]

    Combustion Research | Department of Energy ace_07_oefelein.pdf (4.03 MB) More Documents & Publications Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel Engine Combustion Research Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine Combustion Research Vehicle Technologies Office Merit Review 2014: Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research Combustion Research | Department of Energy

    1 DOE Hydrogen and Fuel Cells Program,

  16. Microsoft PowerPoint - wrf_les_2007_zhu.ppt [Compatibility Mode]

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    LES Testbed Prototype: ARM LES Testbed Prototype: Multi-Scale WRF Simulations of Boundary Layer Clouds Ping Zhu Florida International University Pavlos Kollias Brookhaven National Laboratory Bruce Albrecht University of Miami What is ARM-LES-Testbed ? It is structured to provide a framework for effectively organizing and using the extensive data generated by the ARM radars and other ARM observing systems for boundary layer cloud studies and for evaluating high resolution simulations. GCM/ PAR

  17. LASSO: Tying ARM Data and LES Modeling Together to Improve Climate Science

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    LASSO: Tying ARM Data and LES Modeling Together to Improve Climate Science New Routine Modeling The pilot modeling project, called LASSO-the LES ARM Symbiotic Simulation and Observation workflow-is laying the groundwork to produce routine LES modeling at the ARM Southern Great Plains (SGP) megasite starting in 2017. The initial LASSO implementation will target shallow clouds and will later expand to other phenomena and ARM sites. A key to creating the next-generation Atmospheric Radiation

  18. Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Combustion Research | Department of Energy Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine Combustion Research Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine Combustion Research 2009 DOE Hydrogen Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting, May 18-22, 2009 -- Washington D.C. ace_07_oefelein.pdf (4.03 MB) More Documents & Publications Large Eddy Simulation (LES) Applied to Low-Temperature and Diesel Engine

  19. Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award

    Broader source: Energy.gov [DOE]

    The Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award is designed to recognize special contributions made by the Department’s LES/FSN’s in achieving the U.S. Department of Energy’s (DOE) and United States Government’s (USG) foreign policy goals and objectives.

  20. CRC handbook of agricultural energy potential of developing countries

    SciTech Connect (OSTI)

    Duke, J.A.

    1986-01-01

    The contents of this book are: Introduction; Kenya; Korea (Republic of); Lesotho; Liberia; Malagasy; Malawi; Mali; Mauritania; Mexico, Mozambique, Nepal; Nicaragua; Niger; Nigeria; Pakistan; Panama; Paraguay; Peru; Philippines; Rwanda; Senegal; Sierra Leone; Somalia; Sri Lanka; Sudana; Surinam; Swaziland; Tanzania; Thailand; Togo; Uganda; Uruguay; Venezuela; Zaire; Zambia; Appendix I. Conventional and Energetic Yields; Appendix II, Phytomass Files; and References.

  1. LES ARM Symbiotic Simulation and Observation (LASSO) Implementation Strategy

    SciTech Connect (OSTI)

    Gustafson Jr., WI; Vogelmann, AM

    2015-09-01

    This document illustrates the design of the Large-Eddy Simulation (LES) ARM Symbiotic Simulation and Observation (LASSO) workflow to provide a routine, high-resolution modeling capability to augment the U.S. Department of Energy (DOE) Atmospheric Radiation Measurement (ARM) Climate Research Facility’s high-density observations. LASSO will create a powerful new capability for furthering ARM’s mission to advance understanding of cloud, radiation, aerosol, and land-surface processes. The combined observational and modeling elements will enable a new level of scientific inquiry by connecting processes and context to observations and providing needed statistics for details that cannot be measured. The result will be improved process understanding that facilitates concomitant improvements in climate model parameterizations. The initial LASSO implementation will be for ARM’s Southern Great Plains site in Oklahoma and will focus on shallow convection, which is poorly simulated by climate models due in part to clouds’ typically small spatial scale compared to model grid spacing, and because the convection involves complicated interactions of microphysical and boundary layer processes.

  2. LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS

    SciTech Connect (OSTI)

    Steve Cannon; Baifang Zuo; Virgil Adumitroaie; Keith McDaniel; Cliff Smith

    2002-01-01

    Further development of a combustion Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this fifth quarterly report. CFD Research Corporation (CFDRC) is developing the LES module within the parallel, unstructured solver included in the commercial CFD-ACE+ software. In this quarter, in-situ adaptive tabulation (ISAT) for efficient chemical rate storage and retrieval was further tested in the LES code. The use of multiple trees and periodic tree dumping was investigated. Implementation of the Linear Eddy Model (LEM) for subgrid chemistry was finished for serial applications. Validation of the model on a backstep reacting case was performed. Initial calculations of the SimVal experiment were performed for various barrel lengths, equivalence ratio, combustor shapes, and turbulence models. The effects of these variables on combustion instability was studied. Georgia Tech continues the effort to parameterize the LEM over composition space so that a neural net can be used efficiently in the combustion LES code. Next quarter, the 2nd consortium meeting will be held at CFDRC. LES software development and testing will continue. Alpha testing of the code will be performed on cases of interest to the industrial consortium. Optimization of subgrid models will be pursued, particularly with the ISAT approach. Also next quarter, the demonstration of the neural net approach, for chemical kinetics speed-up in CFD-ACE+, should be accomplished.

  3. LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS

    SciTech Connect (OSTI)

    Steven Cannon; Baifang Zuo; Virgil Adumitroaie; Keith McDaniel; Clifford Smith

    2002-04-30

    Further development of a combustion Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this sixth quarterly report. CFD Research Corporation (CFDRC) is developing the LES module within the parallel, unstructured solver included in the commercial CFD-ACE+ software. In this quarter, in-situ adaptive tabulation (ISAT) for efficient chemical rate storage and retrieval was implemented and tested within the Linear Eddy Model (LEM). ISAT type 3 is being tested so that extrapolation can be performed and further improve the retrieval rate. Further testing of the LEM for subgrid chemistry was performed for parallel applications and for multi-step chemistry. Validation of the software on backstep and bluff-body reacting cases were performed. Initial calculations of the SimVal experiment at Georgia Tech using their LES code were performed. Georgia Tech continues the effort to parameterize the LEM over composition space so that a neural net can be used efficiently in the combustion LES code. A new and improved Artificial Neural Network (ANN), with log-transformed output, for the 1-step chemistry was implemented in CFDRC's LES code and gave reasonable results. This quarter, the 2nd consortium meeting was held at CFDRC. Next quarter, LES software development and testing will continue. Alpha testing of the code will continue to be performed on cases of interest to the industrial consortium. Optimization of subgrid models will be pursued, particularly with the ISAT approach. Also next quarter, the demonstration of the neural net approach, for multi-step chemical kinetics speed-up in CFD-ACE+, will be accomplished.

  4. LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS

    SciTech Connect (OSTI)

    Clifford Smith

    2003-09-01

    Application and testing of the new combustion Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this 12th quarterly report. In this quarter, continued validation and testing of the combustion LES code was performed for the DOE-SimVal combustor. Also, beta testing by six consortium members was performed for various burner and combustor configurations. A list of suggested code improvements by the beta testers was itemized. Work will continue in FY04. A conditional modification to the contract will be granted. The additional work will focus on modeling/analyzing the SimVal experiments.

  5. LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS

    SciTech Connect (OSTI)

    Steven Cannon; Clifford Smith

    2003-04-01

    Application and testing of the new combustion Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this 10th quarterly report. CFD Research Corporation has developed the LES module within the parallel, unstructured solver included in the commercial CFD-ACE+ software. In this quarter, validation and testing of the combustion LES code was performed for the DOE-Simval combustor. Also, Beta testing by consortium members was performed for various burner and combustor configurations. In the two quarters ahead, CFDRC will validate the code on the new DOE SimVal experiments. Experimental data from DOE should be available in June 2003, though LES calculations are currently being performed. This will ensure a truly predictive test of the software. CFDRC will also provide help to the consortium members on running their cases, and incorporate improvements to the software suggested by the beta testers. The beta testers will compare their predictions with experimental measurements and other numerical calculations. At the end of this project (October, 2003), a final released version of the software will be available for licensing to the general public.

  6. LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS

    SciTech Connect (OSTI)

    Clifford E. Smith; Steven M. Cannon; Virgil Adumitroaie; David L. Black; Karl V. Meredith

    2005-01-01

    In this project, an advanced computational software tool was developed for the design of low emission combustion systems required for Vision 21 clean energy plants. Vision 21 combustion systems, such as combustors for gas turbines, combustors for indirect fired cycles, furnaces and sequestrian-ready combustion systems, will require innovative low emission designs and low development costs if Vision 21 goals are to be realized. The simulation tool will greatly reduce the number of experimental tests; this is especially desirable for gas turbine combustor design since the cost of the high pressure testing is extremely costly. In addition, the software will stimulate new ideas, will provide the capability of assessing and adapting low-emission combustors to alternate fuels, and will greatly reduce the development time cycle of combustion systems. The revolutionary combustion simulation software is able to accurately simulate the highly transient nature of gaseous-fueled (e.g. natural gas, low BTU syngas, hydrogen, biogas etc.) turbulent combustion and assess innovative concepts needed for Vision 21 plants. In addition, the software is capable of analyzing liquid-fueled combustion systems since that capability was developed under a concurrent Air Force Small Business Innovative Research (SBIR) program. The complex physics of the reacting flow field are captured using 3D Large Eddy Simulation (LES) methods, in which large scale transient motion is resolved by time-accurate numerics, while the small scale motion is modeled using advanced subgrid turbulence and chemistry closures. In this way, LES combustion simulations can model many physical aspects that, until now, were impossible to predict with 3D steady-state Reynolds Averaged Navier-Stokes (RANS) analysis, i.e. very low NOx emissions, combustion instability (coupling of unsteady heat and acoustics), lean blowout, flashback, autoignition, etc. LES methods are becoming more and more practical by linking together tens

  7. Using LES to Study Reacting Flows and Instabilities in Annular Combustion

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Chambers | Argonne Leadership Computing Facility Using LES to Study Reacting Flows and Instabilities in Annular Combustion Chambers Authors: Staffelbach, G., Wolf, P., Roux, A., Poinsot, T., Balakrishnan, R. Great prominence is put on the design of aeronautical gas turbines due to increasingly stringent regulations and the need to tackle rising fuel prices. This drive towards innovation has resulted sometimes in new concepts being prone to combustion instabilities. In the particular field of

  8. DNS/LES of Complex Turbulent Flows | Argonne Leadership Computing Facility

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Autoignition of a turbulent hydrogen jet injected into hot oxygen Autoignition of a turbulent hydrogen jet injected into hot oxygen. The green isocontours illustrate the turbulent structures in the fuel, the blue isocontours show the HO2 radical (an important precursor to autoignition), and the orange isosurfaces illustrate temperature. Credit: Rajapadiyan Asaithambi and Krishnan Mahesh, University of Minnesota DNS/LES of Complex Turbulent Flows PI Name: Krishnan Mahesh PI Email: mahesh@umn.edu

  9. LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS

    SciTech Connect (OSTI)

    Steve Cannon; Virgil Adumitroaie; Keith McDaniel; Cliff Smith

    2001-05-01

    Further development of a Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this second quarterly report. CFD Research Corporation (CFDRC) is developing the LES module within the parallel, unstructured solver included in the commercial CFD-ACE+ software. CFDRC has implemented and tested Smagorinsky and localized dynamic subgrid turbulence models on a 2.1 million cell DOE-NETL combustor case and a 400,000 cell nonreacting backstep case. Both cases showed good agreement between predicted and experimental results. The large DOE-NETL case results provided better agreement with the measured oscillation frequency than previous attempts because massive parallel computing (on a cluster of 24 pcs) allowed the entire computational domain, including the swirler vanes and fuel spokes, to be modeled. Subgrid chemistry models, including the conditional moment closure (CMC) and linear eddy model (LEM), are being tested and implemented. Reduced chemical mechanisms have been developed for emissions, ignition delay, extinction, and flame propagation using a computer automated reduction method (CARM). A 19-species natural gas mechanism, based on GRI2.11 and Miller-NO{sub x}, was shown to predict rich NO{sub x} emissions better than any previously published mechanisms. The ability to handle this mechanism in CFD-ACE+ was demonstrated by implementing operator splitting and a stiff ODE solver (DVODE). Efficient tabulation methods, including in situ adaptation and artificial neural nets, are being studied and will be implemented in the LES code. The LES combustion code development and testing is on schedule. Next quarter, initial results (including the DOE-NETL unstable combustor) with the CMC and LEM subgrid chemistry models will be completed and summarized.

  10. South America, Central America, the Caribbean, and Mexico

    SciTech Connect (OSTI)

    Deal, C.

    1981-10-01

    Summaries of oil and gas drillings, well completions, production, exploratory wells, exploration activity and wildcat drilling were given for South America, Central America, the Caribbean, and Mexico. The countries, islands, etc. included Argentina, Bahamas, Barbados, Belize, Bolivia, Brazil, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, French Guiana, Guatemala, Guyana, Haiti, Honduras, Jamaica, Leeward and Windward Islands, Mexico, Netherlands Antilles, Nicaragua, Panama, Paraguay, Peru, Puerto Rico, El Salvador, Surinam, Trinidad and Venezuela. 16 figures, 120 tables. (DP)

  11. A Study of Strain Rate Effects for Turbulent Premixed Flames with Application to LES of a Gas Turbine Combustor Model

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Kemenov, Konstantin A.; Calhoon, William H.

    2015-03-24

    Large-scale strain rate field, a resolved quantity which is easily computable in large-eddy simulations (LES), could have profound effects on the premixed flame properties by altering the turbulent flame speed and inducing local extinction. The role of the resolved strain rate has been investigated in a posterior LES study of GE lean premixed dry low NOx emissions LM6000 gas turbine combustor model. A novel approach which is based on the coupling of the lineareddy model with a one-dimensional counter-flow solver has been applied to obtain the parameterizations of the resolved premixed flame properties in terms of the reactive progress variable,more » the local strain rate measure, and local Reynolds and Karlovitz numbers. The strain rate effects have been analyzed by comparing LES statistics for several models of the turbulent flame speed, i.e, with and without accounting for the local strain rate effects, with available experimental data. The sensitivity of the simulation results to the inflow velocity conditions as well as the grid resolution have been also studied. Overall, the results suggest the necessity to represent the strain rate effects accurately in order to improve LES modeling of the turbulent flame speed.« less

  12. A Study of Strain Rate Effects for Turbulent Premixed Flames with Application to LES of a Gas Turbine Combustor Model

    SciTech Connect (OSTI)

    Kemenov, Konstantin A.; Calhoon, William H.

    2015-03-24

    Large-scale strain rate field, a resolved quantity which is easily computable in large-eddy simulations (LES), could have profound effects on the premixed flame properties by altering the turbulent flame speed and inducing local extinction. The role of the resolved strain rate has been investigated in a posterior LES study of GE lean premixed dry low NOx emissions LM6000 gas turbine combustor model. A novel approach which is based on the coupling of the lineareddy model with a one-dimensional counter-flow solver has been applied to obtain the parameterizations of the resolved premixed flame properties in terms of the reactive progress variable, the local strain rate measure, and local Reynolds and Karlovitz numbers. The strain rate effects have been analyzed by comparing LES statistics for several models of the turbulent flame speed, i.e, with and without accounting for the local strain rate effects, with available experimental data. The sensitivity of the simulation results to the inflow velocity conditions as well as the grid resolution have been also studied. Overall, the results suggest the necessity to represent the strain rate effects accurately in order to improve LES modeling of the turbulent flame speed.

  13. LES SOFTWARE FOR THE DESIGN OF LOW EMISSION COMBUSTION SYSTEMS FOR VISION 21 PLANTS

    SciTech Connect (OSTI)

    Cannon, Steven M.; Adumitroaie, Virgil; McDaniel, Keith S.; Smith, Clifford E.

    2001-11-06

    In this project, an advanced computational software tool will be developed for the design of low emission combustion systems required for Vision 21 clean energy plants. This computational tool will utilize Large Eddy Simulation (LES) methods to predict the highly transient nature of turbulent combustion. The time-accurate software will capture large scale transient motion, while the small scale motion will be modeled using advanced subgrid turbulence and chemistry closures. This three-year project is composed of: Year 1--model development/implementation, Year 2--software alpha validation, and Year 3--technology transfer of software to industry including beta testing. In this first year of the project, subgrid models for turbulence and combustion are being developed through university research (Suresh Menon-Georgia Tech and J.-Y. Chen- UC Berkeley) and implemented into a leading combustion CFD code, CFD-ACE+. The commercially available CFDACE+ software utilizes unstructured , parallel architecture and 2nd-order spatial and temporal numerics. To date, the localized dynamic turbulence model and reduced chemistry models (up to 19 species) for natural gas, propane, hydrogen, syngas, and methanol have been incorporated. The Linear Eddy Model (LEM) for subgrid combustion-turbulence interaction has been developed and implementation into CFD-ACE+ has started. Ways of reducing run-time for complex stiff reactions is being studied, including the use of in situ tabulation and neural nets. Initial validation cases have been performed. CFDRC has also completed the integration of a 64 PC cluster to get highly scalable computing power needed to perform the LES calculations ({approx} 2 million cells) in several days. During the second year, further testing and validation of the LES software will be performed. Researchers at DOE-NETL are working with CFDRC to provide well-characterized high-pressure test data for model validation purposes. To insure practical, usable software is

  14. Simulating atmosphere flow for wind energy applications with WRF-LES

    SciTech Connect (OSTI)

    Lundquist, J K; Mirocha, J D; Chow, F K; Kosovic, B; Lundquist, K A

    2008-01-14

    Forecasts of available wind energy resources at high spatial resolution enable users to site wind turbines in optimal locations, to forecast available resources for integration into power grids, to schedule maintenance on wind energy facilities, and to define design criteria for next-generation turbines. This array of research needs implies that an appropriate forecasting tool must be able to account for mesoscale processes like frontal passages, surface-atmosphere interactions inducing local-scale circulations, and the microscale effects of atmospheric stability such as breaking Kelvin-Helmholtz billows. This range of scales and processes demands a mesoscale model with large-eddy simulation (LES) capabilities which can also account for varying atmospheric stability. Numerical weather prediction models, such as the Weather and Research Forecasting model (WRF), excel at predicting synoptic and mesoscale phenomena. With grid spacings of less than 1 km (as is often required for wind energy applications), however, the limits of WRF's subfilter scale (SFS) turbulence parameterizations are exposed, and fundamental problems arise, associated with modeling the scales of motion between those which LES can represent and those for which large-scale PBL parameterizations apply. To address these issues, we have implemented significant modifications to the ARW core of the Weather Research and Forecasting model, including the Nonlinear Backscatter model with Anisotropy (NBA) SFS model following Kosovic (1997) and an explicit filtering and reconstruction technique to compute the Resolvable Subfilter-Scale (RSFS) stresses (following Chow et al, 2005).We are also modifying WRF's terrain-following coordinate system by implementing an immersed boundary method (IBM) approach to account for the effects of complex terrain. Companion papers presenting idealized simulations with NBA-RSFS-WRF (Mirocha et al.) and IBM-WRF (K. A. Lundquist et al.) are also presented. Observations of flow

  15. Les Houches Physics at TeV Colliders 2005 Beyond the Standard Model Working Group: Summary Report

    SciTech Connect (OSTI)

    Allanach, B.C.; Grojean, C.; Skands, P.; Accomando, E.; Azuelos, G.; Baer, H.; Balazs, C.; Belanger, G.; Benakli, K.; Boudjema, F.; Brelier, B.; Bunichev, V.; Cacciapaglia, G.; Carena, M.; Choudhury, D.; Delsart, P.-A.; De Sanctis, U.; Desch, K.; Dobrescu, B.A.; Dudko, L.; El Kacimi, M.; /Saclay, SPhT /CERN /Fermilab /INFN, Turin /Turin U. /Montreal U. /TRIUMF /Florida State U. /Argonne /Annecy, LAPTH /Paris, LPTHE /Moscow State U. /Cornell U., CIHEP /Delhi U. /Milan U. /INFN, Milan /Freiburg U. /Cadi Ayyad U., Marrakech /Orsay, LPT /Oslo U. /Lancaster U.

    2006-03-17

    The work contained herein constitutes a report of the ''Beyond the Standard Model'' working group for the Workshop ''Physics at TeV Colliders'', Les Houches, France, 2-20 May, 2005. We present reviews of current topics as well as original research carried out for the workshop. Supersymmetric and non-supersymmetric models are studied, as well as computational tools designed in order to facilitate their phenomenology.

  16. Microsoft Word - Advanced Solution Verification of CFD Solutions for LES of GTRF_Rider_August23.docx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    VUQ.VVDA.P4.03 Jim Stewart SNL Completed: 8/31/2012 CASL-U-2012-0132-000 Advanced Solution Verification of CFD Solutions for LES o f R elevance t o GTRF Estimates. William J. Rider and James R. Kamm Sandia N ational L aboratories Albuquerque, NM 87185 August 31, 2012 SAND 2 012---7199P Summary The purpose of this work is to d emonstrate advanced solution verification (i.e., numerical error estimation) techniques on computational fluid dynamics simulations of interest to CASL. The specific case

  17. Panama-The Mitigation Action Implementation Network (MAIN) |...

    Open Energy Info (EERE)

    of Energy Thailand, Ministry of Industry Thailand, Ministry of Natural Resources and Environment Thailand, Pollution Control Department, Ministry of Natural Resources and...

  18. Hydrothermal model of the Momotombo geothermal system, Nicaragua

    SciTech Connect (OSTI)

    Verma, M.P.; Martinez, E.; Sanchez, M.; Miranda, K.; Gerardo, J.Y.; Araguas, L.

    1996-01-24

    The Momotombo geotherinal field is situated on the northern shore of Lake Managua at the foot of the active Momotombo volcano. The field has been producing electricity since 1983 and has an installed capacity of 70 MWe. The results of geological, geochemical and geophysical studies have been reported in various internal reports. The isotopic studies were funded by the International Atomic Energy Agency (IAEA), Vienna to develop a hydrothermal model of the geothermal system. The chemical and stable isotopic data (δ18O and δD) of the geothermal fluid suggest that the seasonal variation in the production characteristics of the wells is related to the rapid infiltration of local precipitation into the reservoir. The annual average composition of Na+, K+ and Mg2+ plotted on the Na- K-Mg triangular diagram presented by Giggenbach (1988) to identify the state of rock-water interaction in geothermal reservoirs, shows that the fluids of almost every well are shifting towards chemically immature water due to resenroir exploitation. This effect is prominent in wells Mt-2. Mt-12, Mt-22 and Mt-27. The local groundwaters including surface water from Lake Managua have much lower tritium concentrations than sonic of the geothermal well fluids, which have about 6 T.U. The high-tritium wells are located along a fault inferred froin a thermal anomaly. The tritium concentration is also higher in fluids from wells close to the lake. This could indicate that older local precipitation waters are stored in a deep layer within the lake and that they are infiltrating into the geothermal reservoir.

  19. A New Geothermal Resource Map Of Nicaragua | Open Energy Information

    Open Energy Info (EERE)

    volcanic cordillera. From NW to SE, these areas are Volch Cosiguina, Volcin Casita-San Cristbbal, Volciin Telica-El fiajo, San Jacinto-Tizate, El Hoyo-Monte Galiin,...

  20. Simulating flame lift-off characteristics of diesel and biodiesel fuels using detailed chemical-kinetic mechanisms and LES turbulence model.

    SciTech Connect (OSTI)

    Som, S; Longman, D. E.; Luo, Z; Plomer, M; Lu, T; Senecal, P.K.; Pomraning, E

    2012-01-01

    Combustion in direct-injection diesel engines occurs in a lifted, turbulent diffusion flame mode. Numerous studies indicate that the combustion and emissions in such engines are strongly influenced by the lifted flame characteristics, which are in turn determined by fuel and air mixing in the upstream region of the lifted flame, and consequently by the liquid breakup and spray development processes. From a numerical standpoint, these spray combustion processes depend heavily on the choice of underlying spray, combustion, and turbulence models. The present numerical study investigates the influence of different chemical kinetic mechanisms for diesel and biodiesel fuels, as well as Reynolds-averaged Navier-Stokes (RANS) and large eddy simulation (LES) turbulence models on predicting flame lift-off lengths (LOLs) and ignition delays. Specifically, two chemical kinetic mechanisms for n-heptane (NHPT) and three for biodiesel surrogates are investigated. In addition, the RNG k-{epsilon} (RANS) model is compared to the Smagorinsky based LES turbulence model. Using adaptive grid resolution, minimum grid sizes of 250 {micro}m and 125 {micro}m were obtained for the RANS and LES cases respectively. Validations of these models were performed against experimental data from Sandia National Laboratories in a constant volume combustion chamber. Ignition delay and flame lift-off validations were performed at different ambient temperature conditions. The LES model predicts lower ignition delays and qualitatively better flame structures compared to the RNG k-{epsilon} model. The use of realistic chemistry and a ternary surrogate mixture, which consists of methyl decanoate, methyl 9-decenoate, and NHPT, results in better predicted LOLs and ignition delays. For diesel fuel though, only marginal improvements are observed by using larger size mechanisms. However, these improved predictions come at a significant increase in computational cost.

  1. Central America and Cuba in the new world order

    SciTech Connect (OSTI)

    Smith, W.; Gilbert, L.

    1994-03-01

    In Central America and the Caribbean, as in many other parts of the world, military institutions are being forced to define new roles for themselves in the post-Cold War era. In recent times, developments throughout the region, including the dismantling of Panama`s military, the downsizing of the armed forces in El Salvador and Nicaragua, a call by the new Honduran president for military reform and renewed peace talks in Guatemala, suggest that the time may be ripe to reinvigorate earlier regional political organizations and to press for a new round of talks to achieve regional arms control. During the 1980s, the ideological struggle between East and West, reignited by the Nicaraguan revolution in 1979, dragged the entire region into conflicts that devastated the isthmus in terms of human lives and economic infrastructure. Indigenous struggles that had developed during the 1970s were suddenly thrust upon the international stage, becoming part of a larger drama between the superpowers. Conflicts in El Salvador, Nicaragua and Guatemala provided impetus for larger armed forces throughout the region. This growth was justified as necessary to defend the state from external intervention and the established order from internal subversion, goals which were seen as complementary.

  2. United Nations geothermal activities in developing countries

    SciTech Connect (OSTI)

    Beredjick, N.

    1987-07-01

    The United Nations implements technical cooperation projects in developing countries through its Department of Technical Cooperation for Development (DTCD). The DTCD is mandated to explore for and develop natural resources (water, minerals, and relevant infrastructure) and energy - both conventional and new and renewable energy sources. To date, the United Nations has been involved in over 30 geothermal exploration projects (completed or underway) in 20 developing countries: 8 in Africa (Djibouti, Ethiopia, Kenya, Madagascar); 8 in Asia (China, India, Jordan, Philippines, Thailand); 9 in Latin America (Bolivia, Chile, El Salvador, Honduras, Mexico, Nicaragua, Panama) and 6 in Europe (Greece, Romania, Turkey, Yugoslavia). Today, the DTCD has seven UNDP geothermal projects in 6 developing countries. Four of these (Bolivia, China, Honduras, and Kenya) are major exploration projects whose formulation and execution has been possible thanks to the generous contributions under cost-sharing arrangements from the government of Italy. These four projects are summarized.

  3. Panama-Low-Carbon Energy for Central America: Building a Regional...

    Open Energy Info (EERE)

    AgencyCompany Organization World Watch Institute Sector Energy Focus Area Renewable Energy Topics Background analysis, Implementation, Low emission development planning,...

  4. Nicaragua-Low-Carbon Energy for Central America: Building a Regional...

    Open Energy Info (EERE)

    AgencyCompany Organization World Watch Institute Sector Energy Focus Area Renewable Energy Topics Background analysis, Implementation, Low emission development planning,...

  5. Total arsenic in water, fish, and sediments from Lake Xolotlan, Managua, Nicaragua

    SciTech Connect (OSTI)

    Lacayo, M.L.; Cruz, A.; Calero, S.; Lacayo, J.; Fomsgaard, I. )

    1992-09-01

    In recent years there has been increasing concern over arsenic in aquatic environments from such sources as arsenical pesticides, smelters, coal-fired power plants and erosion caused by extensive land use. Another important contribution to As in the environment is the release associated with volcanic activity and hot springs. Lake Xolotlan has a surface area of 1000 km[sup 2]. The content of arsenic in Lake Xolotlan has different origins, such as volcanic activity in the area, waste water from a geothermal plant situated in the Momotombo Volcano on the northwest coast of the lake and a high number of hot springs. The objective of the present study was to determine total As in water, sediments and fish in Lake Xolotlan at different sampling sites. 19 refs., 1 fig., 4 tabs.

  6. TECNOSOL | Open Energy Information

    Open Energy Info (EERE)

    Jump to: navigation, search Name: TECNOSOL Place: Contigua a Panader-a Norma, Nicaragua Sector: Hydro, Solar, Wind energy Product: Nicaragua-based solar, wind, and...

  7. Land use change and carbon exchange in the tropics. I. Detailed estimates for Costa Rice, Panama, Peru, and Bolivia

    SciTech Connect (OSTI)

    Hall, C.A.S.; Detwiler, R.P.; Bogdonoff, P.; Underhill, S.

    1985-01-01

    This group, composed of modelers working in conjunction with tropical ecologists, has produced a simulation model that quantifies the net carbon exchange between tropical vegetation and the atmosphere due to land use change. The model calculates this net exchange by combining estimates of land use change with several estimates of the carbon stored in tropical vegetation and general assumptions about the fate of cleared vegetation. In this report, the authors use estimates of land use and carbon of land use and carbon storage organized into six life zone (sensu Holdridge) categories to calculate the exchange between the atmosphere and the vegetation of four tropical countries. Their analyses of these countries indicate that this life zone approach has several advantages because (a) the carbon content of vegetation varies significantly among life zones, (b) much of the land use change occurs in life zones of only moderate carbon storage, and (c) the fate of cleared vegetation varies among life zones. Their analyses also emphasize the importance of distinguishing between temporary and permanent land use change, as the recovery of vegetation on abandoned areas decreases the net release of carbon due to clearing. They include sensitivity analysis of those factors that they found to be important but are difficult to quantify at present.

  8. Petroleum geology of Pacific margin of Central America and northern South America, from Guatemala to Ecuador

    SciTech Connect (OSTI)

    Scrutton, M.E.; Escalante, G.F.

    1986-07-01

    Exploration for hydrocarbons along the Pacific margin of Central America and northern South America has been limited and spasmodic. Less than 100 exploration wells have been drilled, with nearly 50 of these being in the Santa Elena, Progreso, and Guayas basins in Ecuador. Shows have been reported in some wells, and a few oil seeps are known. The only commercial production established to date has been from the Santa Elena Peninsula in Ecuador in the extreme south of the study area. Understanding of the geology in this part of the continental margin is incomplete at best. This paper reviews present-day knowledge in an attempt to define the sedimentary basins better, to characterize their structure and stratigraphy, and to assess their petroleum prospects. The area of continental margin reviewed is to the north, located northwest of the trench system where oceanic crust of the Cocos plate subducts under the Caribbean plate, and to the south, where the northern part of the Nazca plate collides with the South American plate. This plate tectonic setting forms the framework on which local structural and sedimentary events have created a series of relatively small trench-slope and forearc basins in what is now the coastal plain and adjacent offshore area of Central and South America, south or west of a line of mountain ranges with active volcanism. Sedimentary fill is generally of Tertiary age. The basins and subbasins recognized and described include: in Ecuador - Guayas, Santa Elena, Progreso, Valdivia, Bajo Grande, Manta, Muisne-Esmeraldas, and Borbon; in Colombia - Choco-Pacific; in Panama - Gulf of Panama basin complex (Santiago, Tonosi, Sambu), and Burica-Chiriqui; in Costa Rica - Terraba and Coronado/Tempisque; in Nicaragua - San Juan del Sur; and in the Honduras, El Salvador, and Guatemala - the Pacific coastal basin.

  9. Les vies de Galilée

    ScienceCinema (OSTI)

    None

    2011-10-06

    Qu'est-ce que l'astronomie? A quoi sert-elle ? Qui était Galilée ? Une soirée avec Fiami, auteur et dessinateur autour des vies de Galilée, titre de son nouvel ouvrage. Galilée y joue le protagoniste ou le complice de grandes découvertes à différentes époques et sous divers profils : Galilée à Babylone (-568) | Galilée à Alexandrie (-197) | Galilée en Inde (499) | Galilée à Venise (1609) | Galilée et Halley (1705) | Galilée revient (2009) Dans le cadre de l'année mondiale de l'astronomie. » Tout public » Entrée libre » Réservation groupes au +41 (0)22 767 76 76

  10. 5 - Codes DNS-LES-RANS.key

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    5 t 6 t 1 t 2 t 3 t 4 t 5 t 6 Y. Dhue PhD IMFT 22 Columbian movie: image by D. Mejia, music by Shakira Response to music: LeConte, J. On the influence of musical sounds on the...

  11. Adaptive LES Methodology for Turbulent Flow Simulations

    SciTech Connect (OSTI)

    Oleg V. Vasilyev

    2008-06-12

    Although turbulent flows are common in the world around us, a solution to the fundamental equations that govern turbulence still eludes the scientific community. Turbulence has often been called one of the last unsolved problem in classical physics, yet it is clear that the need to accurately predict the effect of turbulent flows impacts virtually every field of science and engineering. As an example, a critical step in making modern computational tools useful in designing aircraft is to be able to accurately predict the lift, drag, and other aerodynamic characteristics in numerical simulations in a reasonable amount of time. Simulations that take months to years to complete are much less useful to the design cycle. Much work has been done toward this goal (Lee-Rausch et al. 2003, Jameson 2003) and as cost effective accurate tools for simulating turbulent flows evolve, we will all benefit from new scientific and engineering breakthroughs. The problem of simulating high Reynolds number (Re) turbulent flows of engineering and scientific interest would have been solved with the advent of Direct Numerical Simulation (DNS) techniques if unlimited computing power, memory, and time could be applied to each particular problem. Yet, given the current and near future computational resources that exist and a reasonable limit on the amount of time an engineer or scientist can wait for a result, the DNS technique will not be useful for more than 'unit' problems for the foreseeable future (Moin & Kim 1997, Jimenez & Moin 1991). The high computational cost for the DNS of three dimensional turbulent flows results from the fact that they have eddies of significant energy in a range of scales from the characteristic length scale of the flow all the way down to the Kolmogorov length scale. The actual cost of doing a three dimensional DNS scales as Re{sup 9/4} due to the large disparity in scales that need to be fully resolved. State-of-the-art DNS calculations of isotropic turbulence have recently been completed at the Japanese Earth Simulator (Yokokawa et al. 2002, Kaneda et al. 2003) using a resolution of 40963 (approximately 10{sup 11}) grid points with a Taylor-scale Reynolds number of 1217 (Re {approx} 10{sup 6}). Impressive as these calculations are, performed on one of the world's fastest super computers, more brute computational power would be needed to simulate the flow over the fuselage of a commercial aircraft at cruising speed. Such a calculation would require on the order of 10{sup 16} grid points and would have a Reynolds number in the range of 108. Such a calculation would take several thousand years to simulate one minute of flight time on today's fastest super computers (Moin & Kim 1997). Even using state-of-the-art zonal approaches, which allow DNS calculations that resolve the necessary range of scales within predefined 'zones' in the flow domain, this calculation would take far too long for the result to be of engineering interest when it is finally obtained. Since computing power, memory, and time are all scarce resources, the problem of simulating turbulent flows has become one of how to abstract or simplify the complexity of the physics represented in the full Navier-Stokes (NS) equations in such a way that the 'important' physics of the problem is captured at a lower cost. To do this, a portion of the modes of the turbulent flow field needs to be approximated by a low order model that is cheaper than the full NS calculation. This model can then be used along with a numerical simulation of the 'important' modes of the problem that cannot be well represented by the model. The decision of what part of the physics to model and what kind of model to use has to be based on what physical properties are considered 'important' for the problem. It should be noted that 'nothing is free', so any use of a low order model will by definition lose some information about the original flow.

  12. File:Central America 50m Wind Power.pdf | Open Energy Information

    Open Energy Info (EERE)

    Date 20041022 Extent International Countries Belize, Guatemala, Honduras, El Salvador, Nicaragua UN Region Central America Coordinates 13.846614265322,...

  13. File:Cammetst 58.pdf | Open Energy Information

    Open Energy Info (EERE)

    Date 20031210 Extent Central America Countries Belize, Guatemala, Honduras, El Salvador, Nicaragua UN Region Central America Regions Central America Coordinates...

  14. LES ARM Symbiotic Simulation and Observation (LASSO) Implementation...

    Office of Scientific and Technical Information (OSTI)

    This document illustrates the design of the Large-Eddy ... LASSO will create a powerful new capability for furthering ... The result will be improved process understanding that ...

  15. Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research

    Broader source: Energy.gov (indexed) [DOE]

    Control Concept | Department of Energy Understanding the detailed chemistry of Nox Reduction across the combined LNT+SCR system. deer10_crocker.pdf (827.9 KB) More Documents & Publications Development of Optimal Catalyst Designs and Operating Strategies for Lean NOx Reduction in Coupled LNT-SCR Systems Lean NOx Reduction with Dual Layer LNT/SCR Catalysts Diesel NOx Emission Control Concept | Department of Energy

    Experimental results show low-emissions potential - possibly T2/B2

  16. Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research

    Broader source: Energy.gov [DOE]

    2013 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Program Annual Merit Review and Peer Evaluation Meeting

  17. CX-004419: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    City of Panama City Lighting Replacement ProgramCX(s) Applied: B2.5, B5.1Date: 12/07/2009Location(s): Panama City, FloridaOffice(s): Energy Efficiency and Renewable Energy

  18. OLADE-Latin American and Caribbean Energy Efficiency Seminar...

    Open Energy Info (EERE)

    Panama, Mexico, Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela, Barbados, Cuba, Grenada, Haiti, Jamaica,...

  19. Energy-Economic Information System (SIEE) | Open Energy Information

    Open Energy Info (EERE)

    Panama, Mexico, Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela, Barbados, Cuba, Grenada, Haiti, Jamaica,...

  20. OLADE Sustainable Energy Planning Manual | Open Energy Information

    Open Energy Info (EERE)

    Panama, Mexico, Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela, Barbados, Cuba, Grenada, Haiti, Jamaica,...

  1. Legal Energy Information System (SIEL) Database | Open Energy...

    Open Energy Info (EERE)

    Panama, Mexico, Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Peru, Suriname, Uruguay, Venezuela, Barbados, Cuba, Grenada, Haiti, Jamaica,...

  2. Lancaster County, Nebraska: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    Bennet, Nebraska Davey, Nebraska Denton, Nebraska Firth, Nebraska Hallam, Nebraska Hickman, Nebraska Lincoln, Nebraska Malcolm, Nebraska Panama, Nebraska Raymond, Nebraska...

  3. Mini Grid Renewable Energy-Financing Mechanisms | Open Energy...

    Open Energy Info (EERE)

    Micro-finance and Micro and Small Business (MSB) Development: Lessons for the Nicaragua Off-grid Rural Electrification Project, ESMAP, M. Motta and K. Reiche. References...

  4. Observatory of Renewable Energy for Latin America and the Caribbean...

    Open Energy Info (EERE)

    Chile, Costa Rica, Colombia, Cuba, Dominican Republic, Ecuador, Mexico, Nicaragua, Paraguay, Peru, Uruguay UN Region Caribbean, Central America, South America References...

  5. WWS_LorrieC157L_0915

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Ireland Italy Japan Kenya Latvia Lesotho Libya Lithuania Madagascar Malawi Malaysia Mauritius Mexico Mozambique Nepal The Netherlands New Zealand Nicaragua Nigeria Norway ...

  6. WorldWide Science.org

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Libya Lithuania Madagascar Malawi Malaysia Mauritius Mexico Mozambique Nepal The Netherlands New Zealand Nicaragua Nigeria Norway Philippines Poland Portugal Russia Rwanda Saudi ...

  7. NREL: Wind Research - International Wind Resource Maps

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Cuba Dominican Republic El Salvador Fiji Islands Ghana Guatemala Haiti Honduras Indonesia (specific areas) Laos Mexico (specific areas) Mongolia Nicaragua Pakistan Papua New Guinea ...

  8. Assess institutional frameworks for LEDS for land-use sector...

    Open Energy Info (EERE)

    Energy in Low Income Countries (SREP) Nepal-Sectoral Climate Impacts Economic Assessment Nepal-UNEP Green Economy Advisory Services Nicaragua-Joint Programme on Resource...

  9. Microsoft Word - 91180786_2.docx

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    ... Australia, Bahrain, Colombia, Dominican Republic, El Salvador, Guatemala, Honduras, Nicaragua, Chile, Morocco, Canada, Mexico, Oman, Peru, Singapore, Republic of Korea, Jordan, ...

  10. Agenda CBS Public Meeting-Atlanta

    Energy Savers [EERE]

    dispute system and process design consultations and training for resolving environmental and land disputes in Estonia, IsraelWest Bank, Nicaragua, Kazakhstan, Russia, and Germany. ...

  11. Microsoft Word - TOC Section I Conformed thru Mod 274.docx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Nicaragua, or Singapore); (3) A least developed country (Afghanistan, Angola, Bangladesh, Benin, Bhutan, Burkina Faso, Burundi, Cambodia, Cape Verde, Central African...

  12. Geospatial Toolkit | Open Energy Information

    Open Energy Info (EERE)

    Ghana, Guatemala, Honduras, India, Nepal, Nicaragua, Oaxaca, Pakistan, Sri Lanka, Turkey Cost: Free Southern Asia, Southern Asia, Southern Asia, South America, Eastern Asia,...

  13. Microsoft Word - 2002_WREC_SWERA_full_paper.doc

    Open Energy Info (EERE)

    data from geostationary satellites we provide solar irradiance data for Cuba, El Salvador, Honduras, Nicaragua, Guatemala, Brazil, Ghana, Ethiopia, Kenya, China, Sri Lanka,...

  14. File:NREL-camdirjune.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  15. File:NREL-camdirsept.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  16. File:NREL-camdirapr.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  17. File:NREL-camdiraug.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  18. File:NREL-camdirmay.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  19. File:NREL-camdirjan.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  20. File:NREL-camdiroct.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  1. File:NREL-camdirmar.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  2. Production of high Resoulution Irradiance Data for Central America...

    Open Energy Info (EERE)

    irradiance (GHI) and direct irradiance (DNI) data sets for the countries of Cuba, El Salvador, Guatemala, Honduras and Nicaragua. Much of our initial effort focused on building up...

  3. File:NREL-camdirdec.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  4. File:NREL-camgloann.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  5. File:NREL-camdirfeb.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  6. 52

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    country (Australia, Bahrain, Canada, Chile, Costa Rica, Dominican Republic, El Salvador, Guatemala, Honduras, Mexico, Morocco, Nicaragua, Oman, Peru, or Singapore); (3) A...

  7. File:NREL-camdirann.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  8. File:NREL-camdirnov.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  9. File:NREL-camdirjuly.pdf | Open Energy Information

    Open Energy Info (EERE)

    Creation Date 2003-12-10 Extent International Countries Belize, Guatemala, El Salvador, Honduras, Nicaragua UN Region Central America File history Click on a datetime to...

  10. 2014 CHEMICAL REACTIONS AT SURFACES GORDON RESEARCH CONFERENCE AND GORDON RESEARCH SEMINAR (APRIL 28-MAY 3, 2013 - LES DIABLERETS CONFERENCE CENTER, LES DIABLERETS, SWITZERLAND)

    SciTech Connect (OSTI)

    Stair, Peter C.

    2013-02-03

    presentations on chemistry at solid and liquid surfaces of relevance to catalysis, synthesis, photochemistry, environmental science, and tribology. Topics include: Fundamental Surface Chemistry; Catalysis; Solid Liquid and Aerosol Interfaces; Surface Photochemistry; Synthesis of Surfaces; Environmental Interfaces; Hot Topics in Surface Chemical Reactions; Tribology; Gas-Surface Scattering and Reactions; Novel Materials and Environments.

  11. Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Les Houches Conference A. Bazarko Medium Baseline

  12. Category:Countries | Open Energy Information

    Open Energy Info (EERE)

    Korea Northern Mariana Islands Norway O Oman P Pakistan Palau Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Puerto Rico Q Qatar R Republic of Macedonia...

  13. LUG 2015 | Registration

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Norway Oman Pakistan Palau Palestinian Territory, Occupied Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Puerto Rico Qatar Reunion Romania Russian...

  14. Utility Rate Database | Open Energy Information

    Open Energy Info (EERE)

    Islands Norway Oman Pakistan Palau Palestinian Territories Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Islands Poland Portugal Puerto Rico Qatar Romania Russia...

  15. Andean Development Corporation | Open Energy Information

    Open Energy Info (EERE)

    Bolivia Chile Colombia Costa Rica Dominican Republic Ecuador Jamaica Mexico Panama Paraguay Peru Spain Trinidad & Tobago Uruguay Venezuela and 14 private banks in the region....

  16. Energy and Climate Partnership of the Americas Western Hemisphere Clean Energy Initiative

    Broader source: Energy.gov [DOE]

    Energy Ministers of Mexico, Chile, Colombia, Costa Rica, Peru, Panama and the United States announced the creation of a new Western Hemisphere Clean Energy Initiative.

  17. A Review of the World Bank Forest Carbon Partnership Facility...

    Open Energy Info (EERE)

    submitted by Democratic Republic of Congo, Ghana, Guyana, Indonesia, Madagascar, Mexico, Panama and Suriname can be accessed online at: http:www.wri.orggfi ." To access...

  18. Stump the Scientist Question Form | GE Global Research

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Nigeria Norway Northern Mariana Islands Oman Pakistan Palau Palestine Panama Papua New Guinea Paraguay Peru Philippines Poland Portugal Puerto Rico Qatar Romania Russia Rwanda ...

  19. Center for Clean Air Policy (CCAP) | Open Energy Information

    Open Energy Info (EERE)

    in the Cement Sector Mexico-The Mitigation Action Implementation Network (MAIN) Pakistan-The Mitigation Action Implementation Network (MAIN) Panama-The Mitigation Action...

  20. Energy News | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Clean Energy Initiative Energy Ministers of Mexico, Chile, Colombia, Costa Rica, Peru, Panama and the United States announced the creation of a new Western Hemisphere Clean...

  1. Power Projects Limited | Open Energy Information

    Open Energy Info (EERE)

    Limited Jump to: navigation, search Name: Power Projects Limited Address: PO Box 25456 Panama Street Place: Wellington Zip: 6146 Region: New Zealand Sector: Marine and Hydrokinetic...

  2. Wave Energy Technology New Zealand | Open Energy Information

    Open Energy Info (EERE)

    Zealand Jump to: navigation, search Name: Wave Energy Technology New Zealand Address: PO Box 25456 Panama St Place: Wellington Zip: 6146 Region: New Zealand Sector: Marine and...

  3. EIA-814

    U.S. Energy Information Administration (EIA) Indexed Site

    ... ,,,"Panama",710,"PM",3205 ,,,"Papua New Guinea",712,"PP",3203 ,,,"Paraguay",715,"PA",3204 ,,,"Peru",720,"PE",3201 ,,,"Philippines",725,"RP",3295 ...

  4. Shelby County, Iowa: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    Places in Shelby County, Iowa Defiance, Iowa Earling, Iowa Elk Horn, Iowa Harlan, Iowa Irwin, Iowa Kirkman, Iowa Panama, Iowa Portsmouth, Iowa Shelby, Iowa Tennant, Iowa...

  5. REDD+ Country Readiness Preparation Proposals | Open Energy Informatio...

    Open Energy Info (EERE)

    getting-ready Country: Democratic Republic of Congo, Ghana, Guyana, Indonesia, Madagascar, Mexico, Suriname, Panama Middle Africa, Western Africa, South America,...

  6. Vehicle Technologies Office Merit Review 2016: Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research

    Office of Energy Efficiency and Renewable Energy (EERE)

    Presentation given by Sandia National Laboratory (SNL) at the 2016 DOE Vehicle Technologies Office and Hydrogen and Fuel Cells Program Annual Merit Review and Peer Evaluation Meeting about...

  7. Services du Centre de Solutions Pour Les Energies Propres (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2014-05-01

    This is the French translation of the Clean Energy Solutions Center services fact sheet. The Clean Energy Solutions Center (Solutions Center) helps governments, advisors and analysts create policies and programs that advance the deployment of clean energy technologies. The Solutions Center partners with international organizations to provide online training, expert assistance, and technical resources on clean energy policy.

  8. Les Houches guidebook to Monte Carlo generators for hadron collider physics

    SciTech Connect (OSTI)

    Dobbs, Matt A.; Frixione, Stefano; Laenen, Eric; Tollefson, Kirsten

    2004-03-01

    Recently the collider physics community has seen significant advances in the formalisms and implementations of event generators. This review is a primer of the methods commonly used for the simulation of high energy physics events at particle colliders. We provide brief descriptions, references, and links to the specific computer codes which implement the methods. The aim is to provide an overview of the available tools, allowing the reader to ascertain which tool is best for a particular application, but also making clear the limitations of each tool.

  9. Les Houches Guidebook to Monte Carlo generators for hadron collider physics

    SciTech Connect (OSTI)

    Dobbs, M.A

    2004-08-24

    Recently the collider physics community has seen significant advances in the formalisms and implementations of event generators. This review is a primer of the methods commonly used for the simulation of high energy physics events at particle colliders. We provide brief descriptions, references, and links to the specific computer codes which implement the methods. The aim is to provide an overview of the available tools, allowing the reader to ascertain which tool is best for a particular application, but also making clear the limitations of each tool.

  10. From LES to DNS of Explosions in Semi-confined Domains | Argonne Leadership

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Computing Facility A temperature field (transversal cut: red is hot, i.e. the flame, blue is cold gas), along with a cylinder clip of the pressure field. Note the pressure oscillation along the azimuthal position (or angle: from light green to pink), which shows evidence of the presence of an azimuthal acoustic mode. Also displayed are plotted streamlines for two burners; these are colored by the magnitude of velocity. In addition, a semi-transparent view of the geometry along with an

  11. Vehicle Technologies Office Merit Review 2015: Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research

    Broader source: Energy.gov [DOE]

    Presentation given by Sandia National Laboratories at 2015 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about Large Eddy...

  12. Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine Combustion Research

    Broader source: Energy.gov [DOE]

    2010 DOE Vehicle Technologies and Hydrogen Programs Annual Merit Review and Peer Evaluation Meeting, June 7-11, 2010 -- Washington D.C.

  13. Vehicle Technologies Office Merit Review 2014: Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research

    Broader source: Energy.gov [DOE]

    Presentation given by Sandia National Laboratories at 2014 DOE Hydrogen and Fuel Cells Program and Vehicle Technologies Office Annual Merit Review and Peer Evaluation Meeting about large eddy...

  14. NREL: Dynamic Maps, GIS Data, and Analysis Tools - International...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Bhutan.htm Central America Wind 50m Resolution (includes Belize, Cayman Islands, El Salvador, Guatemala, Honduras and Nicaragua (Zip 2.4 MB) 02192009 Central America.htm Chile...

  15. Workbook Contents

    U.S. Energy Information Administration (EIA) Indexed Site

    ... Exports to Panama of Petroleum Coke (Thousand Barrels)","U.S. Exports to Papua New Guinea of Petroleum Coke (Thousand Barrels)","U.S. Exports to Peru of Petroleum Coke ...

  16. Workbook Contents

    U.S. Energy Information Administration (EIA) Indexed Site

    ... Panama of Crude Oil and Petroleum Products (Thousand Barrels)","U.S. Exports to Papua New Guinea of Crude Oil and Petroleum Products (Thousand Barrels)","U.S. Exports to Paracel ...

  17. ,"U.S. Total Crude Oil and Products Imports"

    U.S. Energy Information Administration (EIA) Indexed Site

    ... Panama of Crude Oil and Petroleum Products (Thousand Barrels)","U.S. Imports from Papua New Guinea of Crude Oil and Petroleum Products (Thousand Barrels)","U.S. Imports from Peru ...

  18. BPA-2014-00617-FOIA Response

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    2014 In reply refer to: NN-1 Jorge Hernan Jaramillo Restrepo Interconexion Electrica Colombia-Panama S.A. Av. Aquilino de la Guardia, Torre Banesco Piso 11 Officina 1111 Ciudad de...

  19. FE Clean Coal News | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    near Panama City. Solid oxide fuel cell technology being developed by the Office of Fossil Energy for coal-fueled central power generation is being adapted to power UUVs....

  20. Genomics of Climate Resilience (2013 DOE JGI Genomics of Energy and Environment 8th Annual User Meeting)

    SciTech Connect (OSTI)

    Bermingham, Eldredge

    2013-03-27

    Eldredge Bermingham of the Smithsonian Tropical Research Institute-Panama on "Genomics of climate resilience" at the 8th Annual Genomics of Energy & Environment Meeting on March 27, 2013 in Walnut Creek, Calif.

  1. BPA-2014-00122-FOIA Response

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    a campaign or expedition for which a campaign medal has been authorized, such as El Salvador, Lebanon, Granada, Panama, Southwest Asia, Somalia, and Haiti. You must submit a copy...

  2. Energy Transition Initiative: Island Energy Snapshot - San Andres and Providencia (Fact Sheet); NREL(National Renewable Energy Laboratory)

    SciTech Connect (OSTI)

    2015-03-01

    This profile provides a snapshot of the energy landscape of the Archipelago of San Andres, Providencia, and Santa Catalina (unpopulated), also known as San Andres and Providencia, which is equidistant between Costa Rica and Jamaica and 775 kilometers northwest of Colombia. The archipelago is part of Colombia, though Nicaragua has also laid claim to it.

  3. The\tDOE\tAtmospheric\tRadia4on\tMeasurement\tProgram's LES\tARM\tSymbio4c...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    NCEP * Lower spa*al and temporal resolu*on * Not all ARM observa*ons assimilated * ... ... et al., 2015, JGR) Large Scale Forcing: Spa4al Scale Awareness Ver4cal Velocity ...

  4. Improved Meteorological Input for Atmospheric Release Decision support Systems and an Integrated LES Modeling System for Atmospheric Dispersion of Toxic Agents: Homeland Security Applications

    SciTech Connect (OSTI)

    Arnold, E; Simpson, M; Larsen, S; Gash, J; Aluzzi, F; Lundquist, J; Sugiyama, G

    2010-04-26

    When hazardous material is accidently or intentionally released into the atmosphere, emergency response organizations look to decision support systems (DSSs) to translate contaminant information provided by atmospheric models into effective decisions to protect the public and emergency responders and to mitigate subsequent consequences. The Department of Homeland Security (DHS)-led Interagency Modeling and Atmospheric Assessment Center (IMAAC) is one of the primary DSSs utilized by emergency management organizations. IMAAC is responsible for providing 'a single piont for the coordination and dissemination of Federal dispersion modeling and hazard prediction products that represent the Federal position' during actual or potential incidents under the National Response Plan. The Department of Energy's (DOE) National Atmospheric Release Advisory Center (NARAC), locatec at the Lawrence Livermore National Laboratory (LLNL), serves as the primary operations center of the IMAAC. A key component of atmospheric release decision support systems is meteorological information - models and data of winds, turbulence, and other atmospheric boundary-layer parameters. The accuracy of contaminant predictions is strongly dependent on the quality of this information. Therefore, the effectiveness of DSSs can be enhanced by improving the meteorological options available to drive atmospheric transport and fate models. The overall goal of this project was to develop and evaluate new meteorological modeling capabilities for DSSs based on the use of NASA Earth-science data sets in order to enhance the atmospheric-hazard information provided to emergency managers and responders. The final report describes the LLNL contributions to this multi-institutional effort. LLNL developed an approach to utilize NCAR meteorological predictions using NASA MODIS data for the New York City (NYC) region and demonstrated the potential impact of the use of different data sources and data parameterizations on IMAAC/NARAC fate and transport predictions. A case study involving coastal sea breeze circulation patterns in the NYC region was used to investigate the sensitivity of atmospheric dispersion results on the source of three-dimensional wind field data.

  5. Vehicle Technologies Office Merit Review 2015: Large Eddy Simulation...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Large Eddy Simulation (LES) Applied to Advanced Engine Combustion Research Vehicle Technologies Office Merit Review 2015: Large Eddy Simulation (LES) Applied to Advanced Engine ...

  6. sgp_stratus_poster_v1.0.ppt

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    forcing, large-scale vertical velocity, and latent and sensible heat flux. Introduction LES (SAMEX) baseline WACR profiles (in blue) LES statistics for the SGP stratus control...

  7. Microsoft PowerPoint - ARM2007LetterSize.ppt

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    approximating higher moments of the DSDs based on datasets generated in simulations with LES explicit microphysics model. The study is based on the CIMMS LES model with explicit...

  8. Sandia Energy - Modeling

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    systems. The engine combustion modeling is focused on developing Large Eddy Simulation (LES). LES is being used with closely coupled key target experiments to reveal new...

  9. S.2058: This act may be cited as the Department of Energy National Security Act for Fiscal Year 1999, introduced in the Senate of the United States, One Hundred Fifth Congress, Second Session, May 11, 1998

    SciTech Connect (OSTI)

    1998-12-31

    This bill is to authorize appropriations for fiscal year 1999 for defense activities of the Department of Energy, and for other purposes. Topics addressed in the bill include DOE national security programs including recurring general provisions and program authorizations, restrictions,and limitations; defense nuclear facilities safety board; national defense stockpile; naval petroleum reserves; and Panama Canal commission.

  10. West Coast (PADD 5) Total Crude Oil and Products Imports

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ... Norway 322 170 373 510 1995-2015 Oman 4,008 13,189 3,460 951 1995-2013 Panama 1995-2008 Papua New Guinea 1995-2003 Peru 6,471 5,712 3,017 4,596 3,652 2,234 1993-2015 Philippines 30 ...

  11. Conclusions and recommendations of the Latin America and Caribbean Regional Energy Conservation Seminar, Alajuela, Costa Rica, January 14-17, 1985

    SciTech Connect (OSTI)

    Not Available

    1985-03-29

    Reports were given on active energy-conservation projects in the region (Barbados, Jamaica, Central American region and Panama, Peru, Ecuador, the Dominican Republic, and Costa Rica). In addition, there were presentations on energy auditing, fuel substitution, and financing energy conservation. Although the seminar concentrated on the industrial sector, it also explored opportunities for energy-efficiency improvements in the building and transportation sectors.

  12. Solar-Powered, Liquid-Desiccant Air Conditioner for Low-Electricity Humidity Control: Report and Summary Report

    SciTech Connect (OSTI)

    Dean, J.; Kozubal, E.; Herrmann, L.; Miller, J.; Lowenstein, A.; Barker, G.; Slayzak, S.

    2012-11-01

    The primary objective of this project was to demonstrate the capabilities of a new high-performance, liquid-desiccant dedicated outdoor air system (DOAS) to enhance cooling efficiency and comfort in humid climates while substantially reducing electric peak demand at Tyndall Air Force Base (AFB), which is 12 miles east of Panama City, Florida.

  13. Report on technical exchanges between CESTA and LLNL concerning FEL/induction activities; Bilan des exchanges techniques entre le CESTA et le LLNL sur les activites LEL/induction

    SciTech Connect (OSTI)

    Thevenot, M.; Eyl, P.

    1991-11-06

    Within the framework of scientific collaboration related to FEL (Free Electron Laser) activities between LLNL (Lawrence Livermore National Laboratory, USA) and CESTA [Centre d`Etudes des Systemes et des Technologies Avancees = Advanced Technology and Systems Research Center -- Tr. Ed.], the principal subject of these exchanges was the technology of high-voltage impulse generators designed to supply induction-type [linear] accelerators (LINAC). The role of this cooperative effort, which was to pool the expertise of the two laboratories, was not limited simply to an inspection of installations and methods. On the contrary, it permitted two representatives from each center to participate intimately in the experiments conducted on the experiments conducted on the LLNL equipment, and then at CESTA. 4 refs., 1 fig.

  14. Mesure de la section efficace de production de paires de quarks top dans l'etat final di-electron avec les donnees collectees par l'experience D0 au RunIIa

    SciTech Connect (OSTI)

    Martin Dit Latour, Bertrand; /LPSC, Grenoble

    2008-09-01

    The top quark has been discovered in 1995 by CDF and D0 collaborations in proton-antiproton collisions at the Tevatron. The amount of data recorded by both experiments makes it possible to accurately measure the properties of this very massive quark. This thesis is devoted to the measurement of the top pair production cross-section via the strong interaction, in a final state composed of two electrons, two particle jets and missing transverse energy. It is based on a 1 fb{sup -1} data set collected by the D0 experiment between 2002 and 2006. The reconstruction and identification of electrons and jets is of major importance in this analysis, and have been studied in events where a Z boson is produced together with one or more jets. The Z+jets process is indeed the dominant physics background to top pair production in the dielectron final state. The primary goal of this cross-section measurement is to verify Standard Model predictions. In this document, this result is also interpreted to indirectly extract the top quark mass. Moreover, the cross-section measurement is sensitive to new physics such as the existence of a charged Higgs boson. The selection established for the cross-section analysis has been used to search for a H{sup +} boson lighter than the top quark, where the latter can decay into a W{sup +} or H{sup +} boson and a b quark. The model that has been studied makes the assumption that the H{sup +} boson can only decay into a tau lepton and a neutrino.

  15. Danger radiations

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le conférencier Mons.Hofert parle des dangers et risques des radiations, le contrôle des zones et les précautions à prendre ( p.ex. film badge), comment mesurer les radiations etc.

  16. Microsoft PowerPoint - 10_ROSE_MARTYN_UPDATED_NMMSS_2014_Foreign...

    National Nuclear Security Administration (NNSA)

    88 JAPAN 35 89 PEOPLES' REPUBLIC OF CHINA 37 A8 SWITZERLAND 38 A1 ARGENTINA ... LES CENTRIFUGE ENRICHMENT 76 B7 CHINAJAPAN LES CENTRIFUGE ENRICHMENT 77 A9 ...

  17. Microsoft Word - Foreign Obligation Codes.docx

    National Nuclear Security Administration (NNSA)

    34 88 Japan 35 89 Peoples' Republic of China 36 C1 Russia 37 A8 Switzerland 38 A1 ...JapanLes Centrifuge Enrichment 76 B7 ChinaJapanLes Centrifuge Enrichment 77 A9 ...

  18. Microsoft PowerPoint - 8_Martyn_NMMSS_2013_Foreign Obligations...

    National Nuclear Security Administration (NNSA)

    88 JAPAN 35 89 PEOPLES' REPUBLIC OF CHINA 37 A8 SWITZERLAND 38 A1 ARGENTINA ... LES CENTRIFUGE ENRICHMENT 76 B7 CHINAJAPAN LES CENTRIFUGE ENRICHMENT 77 A9 ...

  19. Microsoft PowerPoint - Foreign Obligations_Julie Hawkins [Compatibilit...

    National Nuclear Security Administration (NNSA)

    88 JAPAN 35 89 PEOPLES' REPUBLIC OF CHINA 37 A8 SWITZERLAND 38 A1 ARGENTINA ... LES CENTRIFUGE ENRICHMENT 76 B7 CHINAJAPAN LES CENTRIFUGE ENRICHMENT 77 A9 ...

  20. Senior Staff Meeting

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG C.Rubbia informe sur les négociations avec le personnel, les discussions avec le conseil d'administration et le budget, suivi des questions

  1. Senior Staff

    ScienceCinema (OSTI)

    None

    2011-04-25

    Discussion entre la direction du Cern et les chefs de divisions et groupes(reorganization of research section)

  2. Lincoln Electric System (Residential)- 2015 Sustainable Energy Program

    Broader source: Energy.gov [DOE]

    Lincoln Electric System (LES) offers several rebates to residential customers who are interested in upgrading to energy efficient household equipment. 

  3. Large Eddy Simulations: Where

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Eddy Simulations: Where observations and modeling collides July 18, 2015 Cascade of Models ⌅ General Circulation Models ⌅ Regional Models ⌅ Large-Eddy Simulations ⌅ Direct Numerical Simulations LES GCM vs LES History Theory What if? Using LES together with Observations Testbed LES 2 / 37 Cascade of Models General Circulation Models ⌅ Domain size: Entire Earth ⌅ Horizontal Boundary conditions: None ⌅ Horizontal grid spacing: 50km ⌅ Total number of points: about 400 ⇥ 400 ⇥ 100

  4. Midday Meeting- Chemically induced Mind Alteration

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le Docteur Hugo Solms parle de l'abus des drogues, pourquoi les gens en prennent et comment vivre sans

  5. Nebraska/Incentives | Open Energy Information

    Open Energy Info (EERE)

    Electric System (Commercial and Industrial) - Sustainable Energy Program (Nebraska) Utility Rebate Program Yes Lincoln Electric System (LES) - Commercial and Industrial...

  6. Fossil Energy-Developed Fuel Cell Technology Being Adapted by Navy for

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Advanced Unmanned Undersea Vehicles | Department of Energy Fossil Energy-Developed Fuel Cell Technology Being Adapted by Navy for Advanced Unmanned Undersea Vehicles Fossil Energy-Developed Fuel Cell Technology Being Adapted by Navy for Advanced Unmanned Undersea Vehicles January 31, 2013 - 12:00pm Addthis An unmanned undersea vehicle (UUV) being deployed during a U.S. Office of Naval Research demonstration near Panama City. Solid oxide fuel cell technology being developed by the Office of

  7. Long Term Applications Received by DOE/FE to Export

    Office of Environmental Management (EM)

    Award | Department of Energy Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award The Locally Employed Staff (LES)/Foreign Service National (FSN) of the Year Award is designed to recognize special contributions made by the Department's LES/FSN's in achieving the U.S. Department of Energy's (DOE) and United States Government's (USG) foreign policy goals and objectives. The LES/FSN of the

  8. Managing Nicaraguan Water Resources Definition and Relative Importance of Information Needs

    SciTech Connect (OSTI)

    Engi, D.; Guillen, S.M.; Vammen, K.

    1999-01-01

    This report provides an overview of the results of the Vital the Nicaraguan Water Resources Management Initiative, Issues process as implemented for a collaborative effort between the Nicaraguan Ministry of Environment and Natural Resources and Sandia National Laboratories. This initiative is being developed to assist in the development of an efficient and sustainable water resources management system for Nicamgua. The Vital Issues process was used to provide information for developing a project that will develop and implement an advanced information system for managing Nicaragua's water resources. Three Vital Issues panel meetings were convened to 1) develop a mission statement and evaluation criteria for identifying and ranking the issues vital to water resources management in Nicaragua 2) define and rank the vital issues; and 3) identify a preliminary list of information needed to address the vital issues. The selection of panelists from the four basic institutional perspectives- government, industiy, academe, and citizens' groups (through nongovernmental organizations (NGOs))-ensured a high level of stakeholder representation on the panels. The already existing need for a water resource management information system has been magnified in the aftemnath of Hurricane Mitch. This information system would be beneficial for an early warning system in emergencies, and the modeling and simulation capabilities of the system would allow for advanced planning. Additionally, the outreach program will provide education to help Nicaraguan improve their water hygiene practices.

  9. Explorer : des clés pour mieux comprendre la matière

    ScienceCinema (OSTI)

    None

    2011-10-06

    Le LHC va-t-il bouleverser les théories de l'infiniment petit ? Les physiciens aimeraient que l'accélérateur fasse trembler le modèle standard. Cette théorie des particules élémentaires et des forces laisse de nombreuses zones d'ombre. Le LHC et ses expériences ont été conçus pour les éclairer.

  10. Stochastic (w*) Convergence for Turbulent Combustion | Argonne...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Stochastic (w*) Convergence for Turbulent Combustion PI Name: James Glimm PI Email: ... chemistry for LES, and (2) stochastic (w*) convergence based on probability ...

  11. 2015 Uranium Marketing Annual Report

    U.S. Energy Information Administration (EIA) Indexed Site

    Enrichment Services, LLC AREVA NC, Inc." "CNEIC (China Nuclear Energy Industry Corporation)","CNEIC (China Nuclear Energy Industry Corporation)","CAMECO" "LES, LLC ...

  12. Evaluation of Techniques to Detect Significant Network Performance...

    Office of Scientific and Technical Information (OSTI)

    results compare and evaluate the accuracy of our detection techniques when applied to step downup, diurnal changes and congestion effects. less Authors: Cottrell, R.Les ;...

  13. Slide 1

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ARM LES Testbed Prototype: Multi-Scale WRF Simulations of Boundary Layer Clouds Bruce Albrecht RSMASUniversity of Miami 2. MULTI-SCALE WRF SIMULATION 4. SUMMARY The comparison ...

  14. Tax Credits, Rebates & Savings | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    (Commercial and Industrial)- 2015 Sustainable Energy Program Lincoln Electric System (LES) offers a variety of energy efficiency incentives for commercial and industrial...

  15. ARM - Publications: Science Team Meeting Documents: Variance...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    in shallow cumulus topped mixed layers is studied using large-eddy simulation (LES) results. The simulations are based on a range of different shallow cumulus cases,...

  16. Tax Credits, Rebates & Savings | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    System (Commercial and Industrial)- Sustainable Energy Program Lincoln Electric System (LES) offers a variety of energy efficiency incentives to their commercial and industrial...

  17. Sticky Thermals: Evidence for a Dominant Balance Between

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    by studying thousands of cloud thermals in a high- resolution large-eddy simulation (LES) of deep convection. Schematically, the acceleration of a cloud thermal can be written...

  18. ARM - Publications: Science Team Meeting Documents

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    this study, a marine stratocumulus cloud was simulated by using a large eddy simulation (LES) model and a detailed microphysical bin model. Including infrared cooling as well as...

  19. Modeling Precipitating Cumulus Congestus Observed by the ARM...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    (GCMs). Typically, results from cloud-resolving models (CRMs) or large-eddy simulation (LES) models serve as benchmarks for developing and tuning single-column models (SCMs),...

  20. Doug Longman | Argonne National Laboratory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of Nozzle Orifice Geometry Fuel Spray Modeling High-Fidelity Large Eddy Simulations (LES) Multi-Dimensional Modeling Simulation Approaches for Drop-in Biofuels Virtual Engine...

  1. Clipsol | Open Energy Information

    Open Energy Info (EERE)

    Clipsol Jump to: navigation, search Name: Clipsol Place: AIX-LES-BAINS, France Zip: 73100 Sector: Solar Product: France-based, solar heater producer. References: Clipsol1 This...

  2. Highlights | Photosynthetic Antenna Research Center

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Bocian January 2012.pdf; September 2013 Richard Cogdell January 2012.pdf; March 2013 Les Dutton & Chris Moser November 2011.pdf; June 2013 Neil Hunter November 2011.pdf; June...

  3. Heliowatt | Open Energy Information

    Open Energy Info (EERE)

    Heliowatt Jump to: navigation, search Name: Heliowatt Place: les Angles, France Zip: 30133 Sector: Solar Product: Heliowatt is the solar arm of Aerowatt established to develop...

  4. Slide 1

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Applied to TransAT Calculations of a Smooth-Wall Turbulent Channel Flow using LES Despoina Chatzikyriakou, Jacopo. Buongiorno, Massachusetts Institute of Technology...

  5. Solydair Energies | Open Energy Information

    Open Energy Info (EERE)

    search Logo: Solydair Energies Name: Solydair Energies Address: Miraval Place: Les Thuiles Zip: 04400 Sector: Renewable Energy Product: Solar Evolution Year Founded: 2009...

  6. ARM - Publications: Science Team Meeting Documents

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    University (b) Twelfth Atmospheric Radiation Measurement (ARM) Science Team Meeting LES (large eddy simulation) models can explicitly resolve large turbulent eddies, which...

  7. VHF Technologies SA aka Flexcell | Open Energy Information

    Open Energy Info (EERE)

    Jump to: navigation, search Name: VHF-Technologies SA (aka Flexcell) Place: Yverdon-les-Bains, Switzerland Zip: CH-1400 Product: Manufactures thin-film amorphous silicon PV...

  8. Alterna Recursos Energetics SL | Open Energy Information

    Open Energy Info (EERE)

    search Name: Alterna Recursos Energetics SL Place: Les Franqueses del Valls, Spain Zip: 8520 Product: Spain-based installer and marketer of roof-mounted PV systems....

  9. Calibration and Forward Uncertainty Propagation for Large-eddy Simulations of Engineering Flows

    SciTech Connect (OSTI)

    Templeton, Jeremy Alan; Blaylock, Myra L.; Domino, Stefan P.; Hewson, John C.; Kumar, Pritvi Raj; Ling, Julia; Najm, Habib N.; Ruiz, Anthony; Safta, Cosmin; Sargsyan, Khachik; Stewart, Alessia; Wagner, Gregory

    2015-09-01

    The objective of this work is to investigate the efficacy of using calibration strategies from Uncertainty Quantification (UQ) to determine model coefficients for LES. As the target methods are for engineering LES, uncertainty from numerical aspects of the model must also be quantified. 15 The ultimate goal of this research thread is to generate a cost versus accuracy curve for LES such that the cost could be minimized given an accuracy prescribed by an engineering need. Realization of this goal would enable LES to serve as a predictive simulation tool within the engineering design process.

  10. Effect of Subgrid Cloud Variability on Parameterization of Indirect...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    used. However, much greater sensitivity is found with the (discontinuous) Tripoli and Cotton (1980) autoconversion. Figure 6. Time evolution of LWP simulated by the LES model and...

  11. Development of capabilities to simulate the coupledthermal-hydrologic...

    Office of Scientific and Technical Information (OSTI)

    Resource Relation: Conference: GOrdon Research Conference: Flow & Transport in Permeable Media ; 2012-06-24 - 2012-06-29 ; Les Diablerets, Switzerland Research Org: Los Alamos ...

  12. Search for: All records | DOE PAGES

    Office of Scientific and Technical Information (OSTI)

    (LES) model are also examined with the same approach. ... Three commonly used parameterizations are also tested on the ... by an exponential function, providing first attempt ...

  13. TITLE

    Office of Legacy Management (LM)

    Gary Forwarding routing: Les Price, PSRD Bill Seay, FSRD Dave Adler, PSRD Loren Marz, PSRD ... Radioactive contamination at the site is a result of uranium extrusion activities which ...

  14. Convention on Supplementary Compensation for Nuclear Damage Contingent...

    Office of Environmental Management (EM)

    Section 934 Convention on Supplementary Compensation for Nuclear Damage Contingent Cost Allocation, Section 934 LES comments in response to Notice of Inquiry on Convention on...

  15. Convention on Supplementary Compensation for Nuclear Damage Contingent Cost Allocation, Section 934

    Broader source: Energy.gov [DOE]

    LES comments in response to Notice of Inquiry on Convention on Supplementary Compensation for Nuclear Damage Contingent Cost Allocation, Section 934

  16. Browse by Discipline -- E-print Network Subject Pathways: Biotechnolog...

    Office of Scientific and Technical Information (OSTI)

    ... Romu (Romu Romero) - Departament de Fsica, Universitat de les Illes Balears Romps, ... Universit di - Dipartimento di Fisica, Laboratorio di Fisica Terrestre Royal ...

  17. Lincoln Electric System (Residential)- Sustainable Energy Program

    Broader source: Energy.gov [DOE]

    Lincoln Electric System (LES) offers several rebates to their residential customers who are interested in upgrading to energy efficient household equipment. 

  18. Lincoln Electric System (Commercial and Industrial)- Sustainable Energy Program

    Broader source: Energy.gov [DOE]

    Lincoln Electric System (LES) offers a variety of energy efficiency incentives to their commercial and industrial customers through the Sustainable Energy Program (SEP). Some incentives are...

  19. Research Highlight

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    convection using a new technique for large-eddy simulations (LES) called "Eulerian direct measurement". These results were confirmed by Dawe and Austin (2011) using a related...

  20. Jawaharlal Nehru

    ScienceCinema (OSTI)

    None

    2011-04-25

    L'orateur S.E. Giusti del Giardino a connu Nehru (ennemi des castes) les dernières années de sa vie

  1. Hydra-TH: A Thermal-Hydraulics Code for Nuclear Reactor Applications

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ... equa- tions of mass, momentum, and energy. The conservation of linear momentum is v t ... While RANS models directly compute statistics, LES produces one realization of a ...

  2. EERE PowerPoint 97-2004 Template: Green Version

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    capabilities through the novel integration of newly emerging, surface-based techniques. ... - Adam Schultz - Paul Vincent Zonge International - Scott Urquhart - Les Beard Project ...

  3. Amnesty International

    ScienceCinema (OSTI)

    None

    2011-04-25

    Martin Ennals est secrétaire général d'Amnesty International et fait un discours sur les droits de l'homme

  4. Researchers develop a new mathematical tool for analyzing and...

    National Nuclear Security Administration (NNSA)

    Friday, January 8, 2016 - 12:00am Lawrence Livermore National Laboratory scientist Les ... Not shown is Manoj Prasad. Photo by Julie RussellLLNL Lawrence Livermore National ...

  5. Lincoln Electric System (Commercial and Industrial)- 2015 Sustainable Energy Program

    Broader source: Energy.gov [DOE]

    Lincoln Electric System (LES) offers a variety of energy efficiency incentives for commercial and industrial customers through the Sustainable Energy Program (SEP). Some incentives are provided on...

  6. World frontiers beckon oil finders

    SciTech Connect (OSTI)

    Not Available

    1991-09-01

    This paper discusses the international aspects of the petroleum industry. Most who work in the industry agree that the possibilities for huge are found largely in international regions. Something that is helping fuel that possibility is the way countries are increasingly opening their doors to US oil industry involvement. Listed in this paper is a partial list of the reported projects now underway around the world involving US companies. It is not intended to be comprehensive, but rather an indication of how work continues despite a general lull atmosphere for the oil industry. These include Albania, Bulgaria, Congo, Czechoslovakia, Dominican Republic, Ethiopia, Ireland, Malta, Madagascar, Mongolia, Mozambique, Nigeria, Panama, Paraquay, and Senegal.

  7. Central American resource studies

    SciTech Connect (OSTI)

    Van Eeckhout, E.; Laughlin, A.W.

    1989-01-01

    Los Alamos National Laboratory has been working with five Central American countries to assist in the development of their energy and mineral resources. Since 1985, mineral resources in Costa Rica, peat resources in Costa Rica and Panama, geothermal energy resources in Honduras and Guatemala, and geothermal field development in El Salvador and Costa Rica have been topics of study. This paper presents an overview of this work -- within these proceedings are papers that deal with specific aspects of each topic, and these will be duly noted. 15 refs., 4 figs.

  8. Precise Relative Earthquake Magnitudes from Cross Correlation

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Cleveland, K. Michael; Ammon, Charles J.

    2015-04-21

    We present a method to estimate precise relative magnitudes using cross correlation of seismic waveforms. Our method incorporates the intercorrelation of all events in a group of earthquakes, as opposed to individual event pairings relative to a reference event. This method works well when a reliable reference event does not exist. We illustrate the method using vertical strike-slip earthquakes located in the northeast Pacific and Panama fracture zone regions. Our results are generally consistent with the Global Centroid Moment Tensor catalog, which we use to establish a baseline for the relative event sizes.

  9. Geothermal activities in Central America

    SciTech Connect (OSTI)

    Whetten, J.T.; Hanold, R.J.

    1985-09-11

    The Agency for International Development is funding a new program in energy and minerals for Central America. Geothermal energy is an important component. A country-wide geothermal assessment has started in Honduras, and other assessment activities are in progress or planned for Costa Rica, El Salvador, Guatemala, and Panama. Instrumentation for well logging has been provided to Costa Rica, and a self-contained logging truck will be made available for use throughout Central America. An important objective of this program is to involve the private sector in resource development. 4 refs., 3 figs.

  10. Top quark mass measurement in the dilepton channel during the D0 experiment at the Tevatron. Mesure de la masse du quark top dans les canaux di-leptoniques auprès de l’expérience DØ au Tevatron

    SciTech Connect (OSTI)

    Croc, Aurelien

    2011-01-01

    The top quark is the heaviest standard model quark. Discovered in 1995 by the two Tevatron experiments it has atypical properties. In particular its time life is so short that it decays before hadronizing, so the top quark mass could be measured with a high precision. Data collected by the DØ experiment between 2002 and 2009, which represent an integrated luminosity of 5.4 fb⁻¹, are used to measure the top quark mass by using the matrix element method in the three dilepton channels: dielectron, electron--muon and dimuon. The measured mass, 174.0 ± 1.8 (stat.) ± 2.4 (syst.) GeV, is in a good agreement with other measurements and limited by the systematic uncertainties for the first time in these channels. In this thesis different approaches have been studied to improve the accuracy of this measurement: the use of b-quark jet identification in order to optimize the selection of top--anti-top events and a better determination of the main systematic uncertainties. A special attention has been paid to the Monte-Carlo simulation of muons in DØ: the improved smearing procedure for the simulated muons, discussed in this thesis, will be used to increase the accuracy of the top properties measurements as well as the precision of many other DØ measurements.

  11. Method for altering the luminescence of a semiconductor

    DOE Patents [OSTI]

    Barbour, J.C.; Dimos, D.B.

    1999-01-12

    A method is described for altering the luminescence of a light emitting semiconductor (LES) device. In particular, a method is described whereby a silicon LES device can be selectively irradiated with a radiation source effective for altering the intensity of luminescence of the irradiated region. 4 figs.

  12. Science anc Society

    SciTech Connect (OSTI)

    2006-09-12

    S.P.Worden, membre technique de l'U.S.délégation à Genève pour les négociations sur les armes nucléaires, est physicien, astronome, scientifique et officier de l'armée de l'air. Il parlera des technologies de défense stratégique

  13. Method for altering the luminescence of a semiconductor

    DOE Patents [OSTI]

    Barbour, J. Charles (Albuquerque, NM); Dimos, Duane B. (Albuquerque, NM)

    1999-01-01

    A method is described for altering the luminescence of a light emitting semiconductor (LES) device. In particular, a method is described whereby a silicon LES device can be selectively irradiated with a radiation source effective for altering the intensity of luminescence of the irradiated region.

  14. Meeting DG's

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG J.Adams commente les 3 thèmes de la réunion: 1.) le prochain DG du Cern (qui sera H.Schopper) 2.) le LEP 3.) les conclusions du comité des finances concernant salaires, allocations etc. Discussion entre le DG J.Adams, Mons.Ullmann, chef du personel et l'auditoire

  15. Science anc Society

    ScienceCinema (OSTI)

    None

    2011-04-25

    S.P.Worden, membre technique de l'U.S.délégation à Genève pour les négociations sur les armes nucléaires, est physicien, astronome, scientifique et officier de l'armée de l'air. Il parlera des technologies de défense stratégique

  16. Carbon dioxide, hydrographic, and chemical data obtained in the South Pacific Ocean (WOCE Sections P16A/P17A, P17E/P19S, and P19C, R/V Knorr, October 1992--April 1993)

    SciTech Connect (OSTI)

    Rubin, S.; Goddard, J.G.; Chipman, D.W.; Takahashi, Taro; Sutherland, S.C.; Reid, J.L.; Swift, J.H.; Talley, L.D.

    1998-06-01

    This data documentation discusses the procedures and methods used to measure total carbon dioxide concentration (TCO{sub 2}) and partial pressure of CO{sub 2} (pCO{sub 2}) in discrete water samples collected during three expeditions of the Research Vessel (R/V) Knorr in the South Pacific Ocean. Conducted as part of the World Ocean Circulation Experiment (WOCE), the first cruise (WOCE Section P16A/P17A) began in Papeete, Tahiti, French Polynesia, on October 6, 1992, and returned to Papeete on November 25, 1992. The second cruise (WOCE Section P17E/P19S) began in Papeete on December 4, 1992, and finished in Punta Arenas, Chile, on January 22, 1993. The third expedition (WOCE Section P19C) started in Punta Arenas, on February 22 and finished in Panama City, Panama, on April 13, 1993. During the three expeditions, 422 hydrographic stations were occupied. Hydrographic and chemical measurements made along WOCE Sections P16A/P17A, P17E/P19S, and P19C included pressure, temperature, salinity, and oxygen [measured by conductivity, temperature, and depth (CTD) sensor], as well as discrete measurements of salinity, oxygen, phosphate, nitrate, nitrite, silicate, chlorofluorocarbons (CFC-11, CFC-12), TCO{sub 2}, and pCO{sub 2} measured at 4 and 20 C. In addition, potential temperatures were calculated from the measured variables.

  17. Learning environment simulator: a tool for local decision makers and first responders

    SciTech Connect (OSTI)

    Leclaire, Rene J; Hirsch, Gary B

    2009-01-01

    The National Infrastructure Simulation and Analysis Center (NISAC) has developed a prototype learning environment simulator (LES) based on the Critical Infrastructure Protection Decision Support System (CIPDSS) infrastructure and scenario models. The LES is designed to engage decision makers at the grass-roots level (local/city/state) to deepen their understanding of an evolving crisis, enhance their intuition and allow them to test their own strategies for events before they occur. An initial version is being developed, centered on a pandemic influenza outbreak and has been successfully tested with a group of hospital administrators and first responders. LES is not a predictive tool but rather a simulated environment allowing the user to experience the complexities of a crisis before it happens. Users can contrast various approaches to the crisis, competing with alternative strategies of their own or other participants. LES is designed to assist decision makers in making informed choices by functionally representing relevant scenarios before they occur, including impacts to critical infrastructures with their interdependencies, and estimating human health & safety and economic impacts. In this paper a brief overview of the underlying models are given followed by a description of the LES, its interface and usage and an overview of the experience testing LES with a group of hospital administrators and first responders. The paper concludes with a brief discussion of the work remaining to make LES operational.

  18. Large eddy simulation models for incompressible magnetohydrodynamics derived from the variational multiscale formulation

    SciTech Connect (OSTI)

    Sondak, David; Oberai, Assad A.

    2012-10-15

    Novel large eddy simulation (LES) models are developed for incompressible magnetohydrodynamics (MHD). These models include the application of the variational multiscale formulation of LES to the equations of incompressible MHD. Additionally, a new residual-based eddy viscosity model is introduced for MHD. A mixed LES model that combines the strengths of both of these models is also derived. The new models result in a consistent numerical method that is relatively simple to implement. The need for a dynamic procedure in determining model coefficients is no longer required. The new LES models are tested on a decaying Taylor-Green vortex generalized to MHD and benchmarked against classical LES turbulence models. The LES simulations are run in a periodic box of size [-{pi}, {pi}]{sup 3} with 32 modes in each direction and are compared to a direct numerical simulation (DNS) with 512 modes in each direction. The new models are able to account for the essential MHD physics which is demonstrated via comparisons of energy spectra. We also compare the performance of our models to a DNS simulation by Pouquet et al.['The dynamics of unforced turbulence at high Reynolds number for Taylor-Green vortices generalized to MHD,' Geophys. Astrophys. Fluid Dyn. 104, 115-134 (2010)], for which the ratio of DNS modes to LES modes is 262:144.

  19. Microsoft Word - Foreign Obligation Codes.docx

    National Nuclear Security Administration (NNSA)

    Obligation Codes - Updated March 2014 Transaction Code Material Balance Code Obligation 1 31 85 Australia 32 86 Canada 33 87 EURATOM 34 88 Japan 35 89 Peoples' Republic of China 36 C1 Russia 37 A8 Switzerland 38 A1 Argentina 39 A2 Brazil 40 A3 Chile 65 C4 Japan/Russia 66 C5 EURATOM/Russia 67 C6 Australia/Japan/Russia 68 C7 Canada/Japan/Russia 69 C8 EURATOM/Japan/Russia 70 B1 Les Centrifuge Enrichment/Japan 71 B2 Australia/Japan/Les Centrifuge Enrichment 72 B3 Canada/Japan/Les Centrifuge

  20. Expo NL inauguration

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG H.Schopper souhaite la bienvenue à toutes les personnes présentes. Plusieurs discours à l'occasion de l'inauguration officielle de l'expo des Pays-Bas.

  1. Colloquium Nobel Celebration : Lederman, L, Schwartz, M and Steinberger, J

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG H.Schopper félicite Mel Schwarz, Leon Ledermann et Jack Steinberger pour leurs haute distinction. Les trois "lauréats" prennent ainsi la parole.

  2. Meeting DG-Staff Association

    ScienceCinema (OSTI)

    None

    2011-04-25

    Discussion avec le DG J.Adams et Mons.Ullmann, concernant les problèmes liés aux conditions de travail, horaires (44h), salaire, allocations, indemnisations, allocations etc.

  3. Meeting Summary for Development of the Hanford Site C Tank Farm...

    Office of Environmental Management (EM)

    Damon Ecology ddel461@ecy.wa.gov Dunning, Dirk ODOE dirk.a.dunning@state.or.us Eberlein, Susan WRPS susanjeberlein@rl.gov Fort, Les WRPS leslieafort@rl.gov Goswami, Dib...

  4. Microsoft Word - kassianov_1_-ei.doc

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ... two sets of cloud fields generated by LES simulation: (a, c) first set (motion of cloud field only), (b,d) ... of vertical cloud structure, in contrast, N hemisph () ...

  5. Haiti - Annual Average Wind Speed at 80 meters

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Liberte Hinche 06-JAN-2014 3.5.1 50 0 Port-au-Prince Jacmel Les Cayes Jeremie 50 100 Kilometers DOMINI REPUBL CAN IC The wind resource estimates on this map are from model...

  6. A Computational Study of the Aerodynamics and Aeroacoustics of...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    USA C. Eric Lynch and Marilyn J. Smith Georgia Institute of Technology, ... 2006-0194 , 2006. 25 Lynch, C. E. and Smith, M. J., "Hybrid RANS-LES Turbulence Models ...

  7. CX-010295: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Development of a Dynamic Wall Layer Model for LES of Internal Combustion Engines CX(s) Applied: A9, B3.6 Date: 05/03/2013 Location(s): California, Michigan Offices(s): National Energy Technology Laboratory

  8. Eia.gov BETA - Analysis & Projections - U.S. Energy Information...

    U.S. Energy Information Administration (EIA) Indexed Site

    Dfinitions relis aux cartes English Franais Espaol A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Parcourir les termes lis aux catgories suivantes: ...

  9. Titre de la présentation

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    flows: k-, k- SST, v2f, RSM, LES Radiative heat transfer (DOM, P-1) Combustion coal, gas, heavy fuel oil (EBU, pdf, LWP) Electric arc and Joule effect Lagrangian ...

  10. ARM - Publications: Science Team Meeting Documents

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Variability of Low Stratus Over the ARM SGP CART Based on Cloud Radar Data and LES Simulations Kogan, Z.N., Mechem, D.B., and Kogan, Y.L., Cooperative Institute for Mesoscale...

  11. Voyage dans le noir. Trous noirs, matière noire, énergie noire et antimatière

    ScienceCinema (OSTI)

    None

    2011-10-06

    Et si nous faisions avec les physiciens un voyage dans le noir ? De l'astrophysique à la physique des particules les trois noirs, la matière noire, l'énergie noire ou l?antimatière intriguent et fascinent. Que sont ces objets qui bousculent nos idées et qui véhiculent parfois des craintes irraisonnées? Luis Alvarez-Gaume, Michael Doser et Christophe Grojean, physiciens du CERN vous invitent à mettre en lumière (!) les constituants de base de la matière et à explorer les mystères de la physique contemporaine. Une soirée lumineuse pour éclairer des concepts et ne plus avoir peur du noir.

  12. Microsoft PowerPoint - NMMSS Role in Preparing a New Facility...

    National Nuclear Security Administration (NNSA)

    Role in Preparing a New Facility for Reporting to the International Atomic Energy Agency ... to the IAEA by the U.S. Government for a new IAEA SELECT facility - LES owned and ...

  13. Quantifying chaotic dynamics from integrate-and-fire processes

    SciTech Connect (OSTI)

    Pavlov, A. N.; Pavlova, O. N.; Mohammad, Y. K.; Kurths, J.

    2015-01-15

    Characterizing chaotic dynamics from integrate-and-fire (IF) interspike intervals (ISIs) is relatively easy performed at high firing rates. When the firing rate is low, a correct estimation of Lyapunov exponents (LEs) describing dynamical features of complex oscillations reflected in the IF ISI sequences becomes more complicated. In this work we discuss peculiarities and limitations of quantifying chaotic dynamics from IF point processes. We consider main factors leading to underestimated LEs and demonstrate a way of improving numerical determining of LEs from IF ISI sequences. We show that estimations of the two largest LEs can be performed using around 400 mean periods of chaotic oscillations in the regime of phase-coherent chaos. Application to real data is discussed.

  14. Layout And Results From The Initial Opeeration Of The High-resolution...

    Office of Scientific and Technical Information (OSTI)

    First results of ion and electron temperature pro le measurements from the x-ray imaging ... The XICS diagnostic provides measurements of ion and electron temperature pro les in LHD ...

  15. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    ... results of ion and electron temperature pro le measurements from the x-ray imaging ... The XICS diagnostic provides measurements of ion and electron temperature pro les in LHD ...

  16. Speech and council's dinner

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le D.G. L.van Hove rend hommage à deux personnalités, les Prof. Wolfgang Gendner (?) et ?, quittants le conseil du Cern. Elles prendront ensuite la parole.

  17. Inauguration Expo Sweden

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG H.Schopper inaugure cette exposition, remercie les personnes qui ont contribué à sa réalisation et donne la parole à l'ambassadeur de Suède et aux autres intervenants

  18. Information Meeting- Education

    ScienceCinema (OSTI)

    None

    2011-04-25

    Suite à un circulaire, Messieurs Goldschmidt et Ullmann donnent plus d'information et attendent des questions/réponses concernant les problèmes d'éducation d'enfants

  19. Pascua Yaqui Tribe - Renewable Energy Development and Deployment Feasibility Study

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Pascua Yaqui Tribe Renewable Energy Development and Deployment Feasibility Study 2012 Pascua Yaqui Tribe * The Pascua Yaqui Tribe has a total enrollment of approximately 18,000. * A small reservaLon with 4,000 residents is located in SW Tucson, Arizona. Many members reside in several recognized communiLes in the Tucson and Phoenix area. History Ancestral Yaquis resided in Sonora, Mexico. Hundreds of years of transmigraLon established permanent communiLes throughout Southern Arizona. History * In

  20. Azimuthal Instabilities in Annular Combustion Chambers | Argonne Leadership

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Computing Facility Azimuthal Instabilities in Annular Combustion Chambers Authors: Wolf, P., Staffelbach, G., Balakrishnan, R., Roux, A., Poinsot, T. Large Eddy Simulations (LES) of a full annular helicopter gas turbine combustor have been performed. Emphasis is placed on the azimuthal mode that often appears in real configurations. The current LES are shown to capture these self-excited modes, with limited impact of the grid resolution. The structure of the azimuthal mode is discussed and

  1. Ecological effects of a major oil spill on Panamanian coastal marine communities

    SciTech Connect (OSTI)

    Jackson, J.B.C.; Cubit, J.D.; Keller, B.D.; Batista, V.; Burns, K.; Caffey, H.M.; Caldwell, R.L.; Garrity, S.D.; Getter, C.D.; Gonzalez, C.; Guzman, H.M.; Kaufmann, K.W.; Knap, A.H.; Levings, S.C.; Marshall, M.J.; Steger, R.; Thompson, R.C.; Weil, E. )

    1989-01-06

    In 1986 more than 8 million liters of crude oil spilled into a complex region of mangroves, seagrasses, and coral reefs just east of the Caribbean entrance to the Panama Canal. This was the largest recorded spill into coastal habitats in the tropical Americas. Many populations of plants and animals in both oiled and unoiled sites had been studied previously, thereby providing an unprecedented measure of ecological variation before the spill. Documentation of the spread of oil and its biological effects begun immediately. Intertidal mangroves, seagrasses, algae, and associated invertebrates were covered by oil and died soon after. More surprisingly, there was also extensive mortality of shallow subtidal reef corals and infauna of seagrass beds. After 1.5 years only some organisms in areas exposed to the open sea have recovered.

  2. The energy situation in five Central American countries

    SciTech Connect (OSTI)

    Trocki, L.; Booth, S.R.; Umana Q, A.

    1987-06-01

    This study describes the energy resources and the changes that have taken place in energy supply and demand in five Central American countries between 1970 and 1984. Economic changes are also reviewed because they influence and are affected by changes in the energy sector. The work was performed under the auspices of the US Agency for International Development. The Central American countries of Costa Rica, El Salvador, Guatemala, Honduras, and Panama are highly dependent on fuel wood as a source of energy, particularly in the residential sector. They also rely upon imported oil products to supply a growing modern sector. Most countries have significant hydroelectric and geothermal resources, and most countries produce a large portion of their electricity from hydroelectric projects. Demand for electricity has grown rapidly. Relative shares of primary versus secondary energy in the five countries vary significantly and strongly correlate with average per capita income. Consumption of secondary energy has declined during the recent economic recession suffered by the region.

  3. International energy outlook. Volume 3. North and South America

    SciTech Connect (OSTI)

    Not Available

    1982-01-01

    Petroleum, coal, and hydropower resources are found, in varying degrees, throughout the Americas. Struggling to maintain or achieve energy self-sufficiency, many North and South American countries are undertaking major projects to develop these, and other, energy sources. This volume, Volume 3 is a compilation of official US government intelligence reports examining the development projects and energy trends in 12 countries of North and South America: Argentina, Bolivia, Brazil, Canada, Colombia, Guatemala, Mexico, Panama, Paraguay, Peru, the United States and Venezuela. The range and detail of country coverage varies, due to availability of reports. Although the book details current energy situations and provides some historical background, its main emphasis is on estimates of future consumption and production, and descriptions of energy programs and plans. Plans in the Americas call for exploiting oil and gas where possible, and making major efforts to develop sources such as coal and hydropower that can be alternatives to imported petroleum. 33 references, 1 figure, 73 tables.

  4. An energy atlas of five Central American countries. Un atlas energetico de cinco paises Centroamericanos

    SciTech Connect (OSTI)

    Trocki, L.; Newman, C.K.; Gurule, F.; Aragon, P.C.; Peck, C.

    1988-08-01

    In a series of maps and figures, this atlas summarizes what is known about the energy resources and how these resources and oil imports supply the energy needs of five Central American countries: Guatemala, El Salvador, Honduras, Costa Rica, and Panama. The main exploited energy resources are firewood, hydroelectric energy, bagasse from sugar cane residues, and geothermal energy. Limited oil exploration in the region has uncovered modest oil resources only in Guatemala. Peat and small coal deposits are also known to exist but are not presently being exploited. After the description of energy resources, this atlas describes energy supply and demand patterns in each country. It concludes with a description of socioeconomic data that strongly affect energy demand. 4 refs.

  5. Comparison of effectiveness of sub-slab ventilation systems for indoor radon mitigation: A numerical study; Comparaison a l`aide d`un outil numerique de l`efficacite des systemes de ventilation active du sol limitant la penetration du radon dans l`habitat

    SciTech Connect (OSTI)

    Bonnefous, Y.C. |; Gadgil, A.J.; Allard, F.

    1992-04-01

    The functioning of an active sub-slab ventilation system (SVS) has been studied successfully with the help of a previously evaluated numerical model. The parameters explored are the permeability of the sub-slab and the gravel placed beneath it, the amplitude of applied pressure at the installation point of the system and the functioning method: depressurization or pressurization. The mechanisms contributing to the success of the two systems are identified. This numerical study shows that the presence of a layer of gravel beneath the sub-slab considerably improves the performance of the SVS. Considered separately from the extremely permeable sub-slabs, the depressurization systems perform better than the pressurization systems. 17 refs. [Francais] Le fonctionnement des Systemes de Ventilation active du Sol (SVS) a ete etudie a l`aide d`un outil numerique precedemment evalue avec succes. Les parametres explores sont les permeabilites du sol et du gravier place sous plancher bas, l`amplitude de la pression appliquee au point d`installation du systeme, et le mode de fonctionnement: Depressurisation ou Pressurisation. Les mecanismes contribuant au succes des deux systemes sont identifies. Cette etude numerique montre que la presence d`une couche de gravier sous plancher bas ameliore de facon considerable les performances des SVS. Mis a part le cas des sols extremement permeables, les systemes de Depressurisation ont de meilleures performances que les systemes de Pressurisation. 17 refs.

  6. Domestic petroleum-product prices around the world. Survey: free market or government price controls

    SciTech Connect (OSTI)

    Not Available

    1983-01-27

    In this issue, Energy Detente draws from their regular Western and Eastern Hemisphere Fuel Price/Tax Series, each produced monthly, and adds other survey data and analysis for a broad view of 48 countries around the world. They find that seven Latin American nations, including OPEC members Venezuela and Ecuador, are among the ten countries with lowest gasoline prices. In this Fourth Special Price Report, Energy Detente provides a first-time presentation of which prices are government-controlled, and which are free to respond to market forces. South Korea, with fixed prices since 1964, has the highest premium-grade gasoline price in our survey, US $5.38 per gallon. Paraguay, with prices fixed by PETROPAR, the national oil company, has the second highest premium gasoline price, US $4.21 per gallon. Nicaragua, also with government price controls, ranks third highest in the survey, with US $3.38 per gallon for premium gasoline. Kuwait shows the lowest price at US $0.55 per gallon. Several price changes from the previous survey reflect changes in currency exchange as all prices are converted to US dollars. The Energy Detente fuel price/tax series is presented for Western Hemisphere countries.

  7. Solar cooking trends--A preliminary report

    SciTech Connect (OSTI)

    Blum, B.L.

    1992-12-31

    This report discusses early results of research on trends in solar cooking worldwide and the key factors in those trends. It is based on household interviews in Belize, Honduras and Nicaragua and mail surveys from scattered individuals and promotion projects worldwide. Household interviews from six more countries will be included in future reports. Early data indicate that where solar cooking has been introduced an immediate, rapid increase in awareness and interest in solar cooking is followed by slow, sustained growth in actual solar cooking two or three years later, after an incubation period. Access to information and affordable materials for the cookers are important. Individual users and promoters both identify similar key elements for effective promotion projects, but in current projects many are often missing. Even so, successes of these small-scale efforts verify the benefits and acceptability of solar cooking to families in many regions, and should encourage much broader promotion efforts. Future reports will explore various economic, technical, cultural and environmental factors in solar cooking use as guides for larger efforts.

  8. Establishing Ergonomics in Industrially Developing Countries

    SciTech Connect (OSTI)

    Stewart, K; Silverstein, B; Kiefer, M

    2005-08-29

    The introduction of ergonomics is an ongoing effort in industrially developing countries and will ultimately require an organized, programmatic approach spanning several countries and organizations. Our preliminary efforts with our partner countries of Viet Nam, Thailand, and Nicaragua have demonstrated that a one-time course is just the first step in a series of necessary events to provide skills and create an infrastructure that will have lasting impact for the host country. To facilitate that any sort of training has a lasting impact, it is recommended that host countries establish a 'contract' with class participants and the guest instructors for at least one follow-up visit so instructors can see the progress and support the participants in current and future efforts. With repeated exchanges, the class participants can become the 'in country experts' and the next generation of ergonomic trainers. Additionally, providing participants with an easy to use hazard assessment tool and methods for evaluating the financial impact of the project (cost/benefit analysis) will assist increase the likelihood of success and establish a foundation for future projects. In the future, developing trade and regionally/culturally specific 'ergonomics toolkits' can help promote broader implementation, especially where training resources may be limited.

  9. Spent sealed radium sources conditioning in Latin America

    SciTech Connect (OSTI)

    Mourao, R.P.

    1999-06-01

    The management of spent sealed sources is considered by the International Atomic Energy Agency (IAEA) one of the greatest challenges faced by nuclear authorities today, especially in developing countries. One of the Agency`s initiatives to tackle this problem is the Spent Radium Sources Conditioning Project, a worldwide project relying on the regional co-operation between countries. A team from the Brazilian nuclear research institute Centro de Desenvolvimento da Tecnologia Nuclear (CDTN) was chosen as the expert team to carry out the operations in Latin America; since December 1996 radium sources have been safely conditioned in Uruguay, Nicaragua, Guatemala, Ecuador and Paraguay. A Quality Assurance Program was established, encompassing the qualification of the capsule welding process, written operational procedures referring to all major steps of the operation, calibration of monitors and information retrievability. A 200L carbon steel drum-based packaging concept was used to condition the sources, its cavity being designed to receive the lead shield device containing stainless steel capsules with the radium sources. As a result of these operations, a total amount of 2,897 mg of needles, tubes, medical applicators, standard sources for calibration, lightning rods, secondary wastes and contaminated objects were stored in proper conditions and are now under control of the nuclear authorities of the visited countries.

  10. Sixth special price report: world petroleum-product prices

    SciTech Connect (OSTI)

    Not Available

    1984-01-11

    Twice annually, Energy Detente accesses its own twice-monthly supplement, the Fuel Price/Tax Series, for an overview of how prices and taxes for refined petroleum products from natural gas to asphalt for end-users are changing. In this issue, it also updates its review of individual nations' pricing as to controls or free-market practices. The front cover chart reveals that, in terms of US dollars, the world average price of regular leaded (RL) gasoline is US $1.63, and high-octane leaded is US $1.78 - a difference of about 9%. A table details RL retail prices, the taxes pertaining to them, the percentages that those taxes are of prices, plus the January 1983 prices and the price change in US dollars over the period. In terms of US dollars, most price changes since January 1983 appear negative - particularly in the cases of Bolivia, El Salvador, and Nicaragua. A view of actual market price changes in terms of national currencies is depicted in another table. The fuel price/tax series and the principal industrial fuel prices are presented for January 1984 for countries of the Eastern Hemisphere.

  11. Dynamic procedure for filtered gyrokinetic simulations

    SciTech Connect (OSTI)

    Morel, P.; Banon Navarro, A.; Albrecht-Marc, M.; Carati, D.; Merz, F.; Goerler, T.; Jenko, F.

    2012-01-15

    Large eddy simulations (LES) of gyrokinetic plasma turbulence are investigated as interesting candidates to decrease the computational cost. A dynamic procedure is implemented in the gene code, allowing for dynamic optimization of the free parameters of the LES models (setting the amplitudes of dissipative terms). Employing such LES methods, one recovers the free energy and heat flux spectra obtained from highly resolved direct numerical simulations. Systematic comparisons are performed for different values of the temperature gradient and magnetic shear, parameters which are of prime importance in ion temperature gradient driven turbulence. Moreover, the degree of anisotropy of the problem, which can vary with parameters, can be adapted dynamically by the method that shows gyrokinetic large eddy simulation to be a serious candidate to reduce numerical cost of gyrokinetic solvers.

  12. Nesting large-eddy simulations within mesoscale simulations for wind energy applications

    SciTech Connect (OSTI)

    Lundquist, J K; Mirocha, J D; Chow, F K; Kosovic, B; Lundquist, K A

    2008-09-08

    With increasing demand for more accurate atmospheric simulations for wind turbine micrositing, for operational wind power forecasting, and for more reliable turbine design, simulations of atmospheric flow with resolution of tens of meters or higher are required. These time-dependent large-eddy simulations (LES), which resolve individual atmospheric eddies on length scales smaller than turbine blades and account for complex terrain, are possible with a range of commercial and open-source software, including the Weather Research and Forecasting (WRF) model. In addition to 'local' sources of turbulence within an LES domain, changing weather conditions outside the domain can also affect flow, suggesting that a mesoscale model provide boundary conditions to the large-eddy simulations. Nesting a large-eddy simulation within a mesoscale model requires nuanced representations of turbulence. Our group has improved the Weather and Research Forecasting model's (WRF) LES capability by implementing the Nonlinear Backscatter and Anisotropy (NBA) subfilter stress model following Kosovic (1997) and an explicit filtering and reconstruction technique to compute the Resolvable Subfilter-Scale (RSFS) stresses (following Chow et al, 2005). We have also implemented an immersed boundary method (IBM) in WRF to accommodate complex terrain. These new models improve WRF's LES capabilities over complex terrain and in stable atmospheric conditions. We demonstrate approaches to nesting LES within a mesoscale simulation for farms of wind turbines in hilly regions. Results are sensitive to the nesting method, indicating that care must be taken to provide appropriate boundary conditions, and to allow adequate spin-up of turbulence in the LES domain.

  13. FUEL-FLEXIBLE GASIFICATION-COMBUSTION TECHNOLOGY FOR PRODUCTION OF H2 AND SEQUESTRATION-READY CO2

    SciTech Connect (OSTI)

    George Rizeq; Janice West; Arnaldo Frydman; Raul Subia; Vladimir Zamansky; Tomasz Wiltowski; Tom Miles; Bruce Springsteen

    2002-04-30

    Further development of a combustion Large Eddy Simulation (LES) code for the design of advanced gaseous combustion systems is described in this sixth quarterly report. CFD Research Corporation (CFDRC) is developing the LES module within the parallel, unstructured solver included in the commercial CFD-ACE+ software. In this quarter, in-situ adaptive tabulation (ISAT) for efficient chemical rate storage and retrieval was implemented and tested within the Linear Eddy Model (LEM). ISAT type 3 is being tested so that extrapolation can be performed and further improve the retrieval rate. Further testing of the LEM for subgrid chemistry was performed for parallel applications and for multi-step chemistry. Validation of the software on backstep and bluff-body reacting cases were performed. Initial calculations of the SimVal experiment at Georgia Tech using their LES code were performed. Georgia Tech continues the effort to parameterize the LEM over composition space so that a neural net can be used efficiently in the combustion LES code. A new and improved Artificial Neural Network (ANN), with log-transformed output, for the 1-step chemistry was implemented in CFDRC's LES code and gave reasonable results. This quarter, the 2nd consortium meeting was held at CFDRC. Next quarter, LES software development and testing will continue. Alpha testing of the code will continue to be performed on cases of interest to the industrial consortium. Optimization of subgrid models will be pursued, particularly with the ISAT approach. Also next quarter, the demonstration of the neural net approach, for multi-step chemical kinetics speed-up in CFD-ACE+, will be accomplished.

  14. L'Aventure du LHC

    ScienceCinema (OSTI)

    None

    2011-10-06

    Cette présentation s?adressera principalement aux personnes qui ont construit le LHC. La construction du LHC fut longue et difficile. De nombreux problèmes sont apparus en cours de route. Tous ont été résolus grâce au dévouement et à l?engagement du personnel et des collaborateurs. Je reviendrai sur les coups durs et les réussites qui ont marqués ces 15 dernières années et je vous montrerai combien cette machine, le fruit de vos efforts, est extraordinaire.

  15. Retirement Kjell Johnsen

    ScienceCinema (OSTI)

    None

    2011-04-25

    A l'occasion de son 65me anniversaire plusieurs orateurs (aussi l'ambassadeur de Norvège) remercient Kjell Johnsen, né en juin 1921 en Norvège, pour ses 34 ans de service au Cern et retracent sa vie et son travail. K.Johnsen a pris part aux premières études sur les accélérateurs du futur centre de physique et fut aussi le père et le premier directeur de l'Ecole du Cern sur les accélérateurs (CAS)

  16. 13.0 LIQUID EFFLUENT TREATMENT AND DISPOSAL 13.1 LIQUID EFFLUENT DISCHARGE RESTRICTIONS

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    3-1 13.0 LIQUID EFFLUENT TREATMENT AND DISPOSAL 13.1 LIQUID EFFLUENT DISCHARGE RESTRICTIONS 13.1.1 Introduction This section addresses requirements for management of restrictions for discharge of liquid effluents to the soil column at Hanford. These managerial requirements are the result, in part, of EPA's and Ecology's reviews of the Liquid Effluent Study (LES) that was submitted by DOE in August 1990. The LES included information on the 33 Phase I and Phase II liquid effluent streams and was

  17. Seminar Andrej Sacharov

    ScienceCinema (OSTI)

    None

    2011-04-25

    A l'occasion de son 63me anniversaire 2 orateurs rendent hommage à A.Sacharov, physicien russe et né à Moscou, pour ses accomplissements scientifiques et son courage. A.Sacharov a dénoncé les dangers de la radioactivité et a tenté de persuader les autorités soviétiques de supprimer une série de test après le developpement de la bombe atomique en 1949 et la bombe à hydrogène en 1953 par un groupe de chercheurs soviétiques. Il a obtenu le prix Nobel en 1975.

  18. Visit CD

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG H.Schopper souhaite la bienvenue aux ambassadeurs des pays membres et aux représentants des pays avec lesquels le Cern entretient des relations proches et fait un exposé sur les activités au Cern

  19. Science and Society-Arms Control

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le Prof.Weisskopf(?) présente le physicien Wolfgang Panofsky qui parle de la stratégie concernant la prolifération nucléaire entre les Etats Unis et l'Union Soviétique

  20. CGILS: Results from the First Phase of an International Project to Understand the Physical Mechanisms of Low Cloud Feedbacks in Single Column Models

    SciTech Connect (OSTI)

    Zhang, Minghua; Bretherton, Christopher S.; Blossey, Peter; Austin, Phillip A.; Bacmeister, J.; Bony, Sandrine; Brient, Florent; Cheedela, Suvarchal K.; Cheng, Anning; Del Genio, Anthony D.; De Roode, Stephan R.; Endo , Satoshi; Franklin, Charmaine N.; Golaz, Jean-Christophe; Hannay, Cecile; Heus, Thijs; Isotta, Francesco A.; Jean-Louis, Dufresne; Kang, In-Sik; Kawai, Hideaki; Koehler, M.; Larson, Vincent E.; Liu, Yangang; Lock, Adrian; Lohmann, U.; Khairoutdinov, Marat; Molod, Andrea M.; Neggers, Roel; Rasch, Philip J.; Sandu, Irina; Senkbeil, Ryan; Siebesma, A. P.; Siegenthaler-Le Drian, Colombe; Stevens, Bjorn; Suarez, Max; Xu, Kuan-Man; Von Salzen, Knut; Webb, Mark; Wolf, Audrey; Zhao, M.

    2013-12-26

    Large Eddy Models (LES) and Single Column Models (SCM) are used in a surrogate climate change 101 to investigate the physical mechanism of low cloud feedbacks in climate models. Enhanced surface-102 driven boundary layer turbulence and shallow convection in a warmer climate are found to be 103 dominant mechanisms in SCMs.

  1. Nick Balthaser! Wayne Hurlbert! LBNL/NERSC Storage Systems Group

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    o f 9 me i n p roduc9on - Drive f eatures i n u se * Data V olume - Carts, T B, fi les * Workload - Exchangesunit 9 me - IO R ates: R aw v s. H PSS * Error R ates * Data L...

  2. The Radiative Properties of Small Clouds: Multi-Scale Observations and Modeling

    SciTech Connect (OSTI)

    Feingold, Graham; McComiskey, Allison

    2013-09-25

    Warm, liquid clouds and their representation in climate models continue to represent one of the most significant unknowns in climate sensitivity and climate change. Our project combines ARM observations, LES modeling, and satellite imagery to characterize shallow clouds and the role of aerosol in modifying their radiative effects.

  3. ARM Climate Research Facility

    Broader source: All U.S. Department of Energy (DOE) Office Webpages

    banner Home | People | Site Index Atmospheric Radiation Measurement Climate Research Facility US Department of Energy About Science Campaigns Sites Instruments Measurements Data News Publications Education Become a User Recovery Act Mission FAQ Outreach Displays History Organization Participants Facility Statistics Forms Contacts Research Themes LES ARM Symbiotic Simulation and Observation Workflow Research Highlights Journal Articles Collaborations Atmospheric System Research (ASR) ARM Science

  4. 10th Anniversary P.S.

    ScienceCinema (OSTI)

    None

    2011-04-25

    John Adams parle de la préhistoire du P.S. avec présentation des dias. Le DG B.Gregory prend la parole. Les organisateurs présentent sous la direction du "Prof.Ocktette"(?) un sketch très humoristique (p.e.existence de Quark etc.....)

  5. Speech Schopper

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG H.Schopper prend congé de ses directeurs et collègues qui partent et remercie aussi les restants pour leur service; d'autres orateurs comme p.ex. Mons.Ullmann ainsi qu'un allemand prennent la parole.

  6. mira perf boot camp 2014-debugging-v1.3.ppt

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    o f c ore fi les - Shows s ymbolic b acktrace - Groups r anks t hat a borted i n t he s ame l oca;on t ogether - Can a lso a +ach t o a r unning j ob t o t ake s napshot ...

  7. Meeting LEP

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG J.Adams fait l'introduction et présente les deux autres orateurs. Pierre Darriulat qui fait un doscours sur la physique à l'occasion du LEP, Wolfgang Schnell, qui parle du projet de la machine LEP et le DG lui-même contribue avec quelques réflexions. Présentation des dias

  8. 2011_INCITE_Fact_Sheets.pdf | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    1_INCITE_Fact_Sheets.pdf 2011_INCITE_Fact_Sheets.pdf (745.56 KB) More Documents & Publications Advance Patent Waiver W(A)2006-028 Large Eddy Simulation (LES) Applied to LTC/Diesel/Hydrogen Engine Combustion Research Vehicle Technologies Office Merit Review 2016: Advancements in Fuel Spray and Combustion Modeling with High Performance Computing Resources

  9. Large eddy simulation of forced ignition of an annular bluff-body burner

    SciTech Connect (OSTI)

    Subramanian, V.; Domingo, P.; Vervisch, L.

    2010-03-15

    The optimization of the ignition process is a crucial issue in the design of many combustion systems. Large eddy simulation (LES) of a conical shaped bluff-body turbulent nonpremixed burner has been performed to study the impact of spark location on ignition success. This burner was experimentally investigated by Ahmed et al. [Combust. Flame 151 (2007) 366-385]. The present work focuses on the case without swirl, for which detailed measurements are available. First, cold-flow measurements of velocities and mixture fractions are compared with their LES counterparts, to assess the prediction capabilities of simulations in terms of flow and turbulent mixing. Time histories of velocities and mixture fractions are recorded at selected spots, to probe the resolved probability density function (pdf) of flow variables, in an attempt to reproduce, from the knowledge of LES-resolved instantaneous flow conditions, the experimentally observed reasons for success or failure of spark ignition. A flammability map is also constructed from the resolved mixture fraction pdf and compared with its experimental counterpart. LES of forced ignition is then performed using flamelet fully detailed tabulated chemistry combined with presumed pdfs. Various scenarios of flame kernel development are analyzed and correlated with typical flow conditions observed in this burner. The correlations between, velocities and mixture fraction values at the sparking time and the success or failure of ignition, are then further discussed and analyzed. (author)

  10. PDSF User Meeting 06-18-13.pptx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Topics from PDSF Staff: In Progress * Test fi les - PuSng t hem t ogether o ver t he n ext f ew w eeks * Benchmarking Topics from the Users * PDSF S teering C ommiQee M eeHng...

  11. PDSF User Meeting 07-02-13.pptx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    N IM d atabase * Will e mail e veryone i n P I l ist * Standard N ERSC m ethod * Benchmarking - PuWng b enchmark fi les i n t op o f a ll eliza d irectories Topics from the...

  12. CX-010779: Categorical Exclusion Determination

    Office of Energy Efficiency and Renewable Energy (EERE)

    Predictive Large Eddy Simulation (LES) Modeling and Validation for High-Pressure Turbulent Flames and Flashback in Hydrogen-Enriched Gas Turbine CX(s) Applied: A9, B3.6 Date: 08/23/2013 Location(s): Texas Offices(s): National Energy Technology Laboratory

  13. Mineral accretion technology for coral reef restoration, shore protection, and adaptation to rising sea level

    SciTech Connect (OSTI)

    Goreau, T.J.; Hilbertz, W.

    1997-12-31

    Electrolysis of seawater is used to precipitate limestone on top of underwater steel structures to create growing artificial reefs to enhance coral growth, restore coral reef habitat, provide shelter for fish, shellfish, and other marine organisms, generate white sand for beach replenishment, and protect shore lines from wave erosion. Films and slides will be shown of existing structures in Jamaica, Panama, and the Maldives, and projects being developed in these and other locations will be evaluated. The method is unique because it creates the only artificial reef structures that generate the natural limestone substrate from which corals and coral reefs are composed, speeding the settlement and growth of calcareous organisms, and attracting the full range of other reef organisms. The structures are self-repairing and grow stronger with age. Power sources utilized include batteries, battery chargers, photovoltaic panels, and windmills. The cost of seawalls and breakwaters produced by this method is less than one tenth that of conventional technology. Because the technology is readily scaled up to build breakwaters and artificial islands able to keep pace with rising sea level it is capable of playing an important role in protecting low lying coastal areas from the effects of global climate change.

  14. Energy-conservation-investment decision making in developing countries: A review of project implementation in industry. Final report

    SciTech Connect (OSTI)

    Not Available

    1989-12-01

    Despite recent efforts in a number of developing countries to promote energy conservation (EC) and efficiency, only a fraction of EC potential has been captured, especially for projects that require significant investments. The document analyzes EC efforts in 11 countries where energy audit and/or feasibility study programs have been carried out (Bangladesh, Costa Rica, Ecuador, El Salvador, Guatemala, Honduras, Jordan, Pakistan, Panama, the Philippines, and Sri Lanka), covering some 1,500 EC projects involving 242 industrial companies. Cost and length of payback seem to be the determining factors for companies considering EC measures; no-cost or low-cost projects with paybacks of less than a year (such as power factor improvement projects) had the highest rate of implementation, while expensive, complicated projects (e.g., cogeneration or fuel substitution projects) were most often rejected. The document concludes, however, that the rate of implementation of EC programs has been quite high, and recommends that inexpensive, short-term projects be featured in future EC programs and increased levels of TA and financial assistance be made available to companies implementing long-term EC measures.

  15. High resolution capillary column development for selective separations in gas chromatography

    SciTech Connect (OSTI)

    Przybyciel, M.

    1985-01-01

    A review of techniques for the preparation of high resolution capillary columns for gas chromatography is presented. Surface roughing, surface deactivation, stationary phase coating, and stationary phase crosslinking are discussed. Criteria for the selection of GC stationary phases and procedures for column evaluation are presented. A method is proposed for the isolation and determination of crude oil contamination in tropical plants and sediments. The method uses Florisil (TM) chromatography for the simultaneous clean-up and fractionation of aliphatic and aromatic hydrocarbons. Crosslinked SE-54 fused silica capillary columns prepared in our laboratory were employed for all GC separations. Mass spectrometry was used to help locate and identify specific oil components despite the intense background of the chromatogram. Crude oil components were identified in extracts of mangrove plant samples collected from the Peck Slip oil spill site at Media Munda, Puerto Rico. Crude oil components were also identified in sediment samples from controlled oil spill of Prudhoe Bay oil at Laguna de Chiriqui, Panama.

  16. Development of Quality Assessment Techniques for Large Eddy Simulation of Propulsion and Power Systems in Complex Geometries

    SciTech Connect (OSTI)

    Lacaze, Guilhem; Oefelein, Joseph

    2015-03-01

    Large-eddy-simulation (LES) is quickly becoming a method of choice for studying complex thermo-physics in a wide range of propulsion and power systems. It provides a means to study coupled turbulent combustion and flow processes in parameter spaces that are unattainable using direct-numerical-simulation (DNS), with a degree of fidelity that can be far more accurate than conventional engineering methods such as the Reynolds-averaged Navier-Stokes (RANS) approx- imation. However, development of predictive LES is complicated by the complex interdependence of different type of errors coming from numerical methods, algorithms, models and boundary con- ditions. On the other hand, control of accuracy has become a critical aspect in the development of predictive LES for design. The objective of this project is to create a framework of metrics aimed at quantifying the quality and accuracy of state-of-the-art LES in a manner that addresses the myriad of competing interdependencies. In a typical simulation cycle, only 20% of the computational time is actually usable. The rest is spent in case preparation, assessment, and validation, because of the lack of guidelines. This work increases confidence in the accuracy of a given solution while min- imizing the time obtaining the solution. The approach facilitates control of the tradeoffs between cost, accuracy, and uncertainties as a function of fidelity and methods employed. The analysis is coupled with advanced Uncertainty Quantification techniques employed to estimate confidence in model predictions and calibrate model's parameters. This work has provided positive conse- quences on the accuracy of the results delivered by LES and will soon have a broad impact on research supported both by the DOE and elsewhere.

  17. Twenty-first workshop on geothermal reservoir engineering: Proceedings

    SciTech Connect (OSTI)

    1996-01-26

    PREFACE The Twenty-First Workshop on Geothermal Reservoir Engineering was held at the Holiday Inn, Palo Alto on January 22-24, 1996. There were one-hundred fifty-five registered participants. Participants came from twenty foreign countries: Argentina, Austria, Canada, Costa Rica, El Salvador, France, Iceland, Indonesia, Italy, Japan, Mexico, The Netherlands, New Zealand, Nicaragua, the Philippines, Romania, Russia, Switzerland, Turkey and the UK. The performance of many geothermal reservoirs outside the United States was described in several of the papers. Professor Roland N. Horne opened the meeting and welcomed visitors. The key note speaker was Marshall Reed, who gave a brief overview of the Department of Energy's current plan. Sixty-six papers were presented in the technical sessions of the workshop. Technical papers were organized into twenty sessions concerning: reservoir assessment, modeling, geology/geochemistry, fracture modeling hot dry rock, geoscience, low enthalpy, injection, well testing, drilling, adsorption and stimulation. Session chairmen were major contributors to the workshop, and we thank: Ben Barker, Bobbie Bishop-Gollan, Tom Box, Jim Combs, John Counsil, Sabodh Garg, Malcolm Grant, Marcel0 Lippmann, Jim Lovekin, John Pritchett, Marshall Reed, Joel Renner, Subir Sanyal, Mike Shook, Alfred Truesdell and Ken Williamson. Jim Lovekin gave the post-dinner speech at the banquet and highlighted the exciting developments in the geothermal field which are taking place worldwide. The Workshop was organized by the Stanford Geothermal Program faculty, staff, and graduate students. We wish to thank our students who operated the audiovisual equipment. Shaun D. Fitzgerald Program Manager.

  18. 25th Birthday Cern- Restaurant

    ScienceCinema (OSTI)

    None

    2011-04-25

    Cérémonie du 25ème anniversaire du Cern avec plusieurs orateurs et la présence de nombreux autorités cantonales et communales genevoises et personnalités, directeurs généraux, ministres, chercheurs.... Le conseiller féderal et chef du département des affaires étrangères de la confédération Monsieur Pierre Aubert prend la parole pour célébrer à la fois les résultats très remarquables de la coopération internationale en matière scientifique, mais aussi la volonté politique des états européens de mettre en commun leurs ressources pour faire oeuvre d'avenir. Un grand hommage est aussi donné aux deux directeurs disparus, les prof.Bakker et Gregory.

  19. Large Eddy Simulation of Wind Turbine Wakes. Detailed Comparisons of Two Codes Focusing on Effects of Numerics and Subgrid Modeling

    SciTech Connect (OSTI)

    Martinez-Tossas, Luis A.; Churchfield, Matthew J.; Meneveau, Charles

    2015-06-18

    In this work we report on results from a detailed comparative numerical study from two Large Eddy Simulation (LES) codes using the Actuator Line Model (ALM). The study focuses on prediction of wind turbine wakes and their breakdown when subject to uniform inflow. Previous studies have shown relative insensitivity to subgrid modeling in the context of a finite-volume code. The present study uses the low dissipation pseudo-spectral LES code from Johns Hopkins University (LESGO) and the second-order, finite-volume OpenFOAMcode (SOWFA) from the National Renewable Energy Laboratory. When subject to uniform inflow, the loads on the blades are found to be unaffected by subgrid models or numerics, as expected. The turbulence in the wake and the location of transition to a turbulent state are affected by the subgrid-scale model and the numerics.

  20. Large Eddy Simulation of Wind Turbine Wakes. Detailed Comparisons of Two Codes Focusing on Effects of Numerics and Subgrid Modeling

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Martinez-Tossas, Luis A.; Churchfield, Matthew J.; Meneveau, Charles

    2015-06-18

    In this work we report on results from a detailed comparative numerical study from two Large Eddy Simulation (LES) codes using the Actuator Line Model (ALM). The study focuses on prediction of wind turbine wakes and their breakdown when subject to uniform inflow. Previous studies have shown relative insensitivity to subgrid modeling in the context of a finite-volume code. The present study uses the low dissipation pseudo-spectral LES code from Johns Hopkins University (LESGO) and the second-order, finite-volume OpenFOAMcode (SOWFA) from the National Renewable Energy Laboratory. When subject to uniform inflow, the loads on the blades are found to bemore » unaffected by subgrid models or numerics, as expected. The turbulence in the wake and the location of transition to a turbulent state are affected by the subgrid-scale model and the numerics.« less

  1. Meeting Jentschke

    ScienceCinema (OSTI)

    None

    2011-04-25

    Après une introduction des dernières recherches et nouvelles au Cern, le DG W.Jentschke parle du futur management du Cern avec deux nouv directeurs générales, responsables pour les 5 ans prochains: le Dr.J.B.Adams qui s'occupera de l'administration du Cern et aussi de la construction des bâtiments et équipements et Le Dr.L.van Hove qui sera responsable pour les activités de la recherche. Le DG parle des changes et structures prévus, des services communs, des différentes divisions et leurs chefs etc...

  2. Minimalist Model of Ice Microphysics in Mixed-phase Stratiform Clouds

    SciTech Connect (OSTI)

    Yang, F.; Ovchinnikov, Mikhail; Shaw, Raymond A.

    2013-07-28

    The question of whether persistent ice crystal precipitation from super cooled layer clouds can be explained by time-dependent, stochastic ice nucleation is explored using an approximate, analytical model, and a large-eddy simulation (LES) cloud model. The updraft velocity in the cloud defines an accumulation zone, where small ice particles cannot fall out until they are large enough, which will increase the residence time of ice particles in the cloud. Ice particles reach a quasi-steady state between growth by vapor deposition and fall speed at cloud base. The analytical model predicts that ice water content (wi) has a 2.5 power law relationship with ice number concentration ni. wi and ni from a LES cloud model with stochastic ice nucleation also confirm the 2.5 power law relationship. The prefactor of the power law is proportional to the ice nucleation rate, and therefore provides a quantitative link to observations of ice microphysical properties.

  3. Slide 1

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Dana Bryson River Corridor Division Director and DDFO to the Hanford Advisory Board S a fe a n d E ff e c ti v e C le a n u p th a t P ro te c ts th e C o lu m b ia R iv e r  Re du ce s the Ac tiv e Sit e Fo otp rin t of Cle an up to 75 Sq ua re Mi les (58 6 to 75 )  Sig nif ica ntl y Re du ce s Lo ng -Te rm Mo rtg ag e Co sts  At Co mp let ion , Sh ifts Em ph as is an d Re so urc es to Fu ll Sc ale Cle an up of the Ce ntr al Pla tea u (75 sq ua re mi les )  Re du ce s Co sts by

  4. Slide 1

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Jonathan A. Dowell DOE-RL Assistant Manager for River and Plateau S a fe a n d E ff e c ti v e C le a n u p th a t P ro te c ts th e C o lu m b ia R iv e r  Re du ce s the Ac tiv e Sit e Fo otp rin t of Cle an up to 75 Sq ua re Mi les (58 6 to 75 )  Sig nif ica ntl y Re du ce s Lo ng -Te rm Mo rtg ag e Co sts  At Co mp let ion , Sh ifts Em ph as is an d Re so urc es to Fu ll Sc ale Cle an up of the Ce ntr al Pla tea u (75 sq ua re mi les )  Re du ce s Co sts by "R igh t Siz ing

  5. CgWind: A high-order accurate simulation tool for wind turbines and wind farms

    SciTech Connect (OSTI)

    Chand, K K; Henshaw, W D; Lundquist, K A; Singer, M A

    2010-02-22

    CgWind is a high-fidelity large eddy simulation (LES) tool designed to meet the modeling needs of wind turbine and wind park engineers. This tool combines several advanced computational technologies in order to model accurately the complex and dynamic nature of wind energy applications. The composite grid approach provides high-quality structured grids for the efficient implementation of high-order accurate discretizations of the incompressible Navier-Stokes equations. Composite grids also provide a natural mechanism for modeling bodies in relative motion and complex geometry. Advanced algorithms such as matrix-free multigrid, compact discretizations and approximate factorization will allow CgWind to perform highly resolved calculations efficiently on a wide class of computing resources. Also in development are nonlinear LES subgrid-scale models required to simulate the many interacting scales present in large wind turbine applications. This paper outlines our approach, the current status of CgWind and future development plans.

  6. Recent Office of Enforcement Cases | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Office of Enforcement Cases Recent Office of Enforcement Cases June 16, 2015 Presenter: Les Bermudez, Office of Worker Safety & Health (EA-11) Topics Covered: Enforcement Program update Six recent NOV actions Enforcement Letters/Consent Orders/Current Investigations/ Recurring Enforcement themes Recent Office of Enforcement Cases (1.01 MB) More Documents & Publications Preliminary Notice of Violation, Fluor-B&W Portsmouth, LLC - July 8, 2014 Preliminary Notice of Violation,

  7. LASSO* - Science Requirements

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    LASSO* - Science Requirements *LES ARM Symbiotic Simulation and Observation (LASSO) workflow Andy Vogelmann 1 , William I Gustafson Jr 2 Zhijin Li 3,4 , Xiaoping Cheng 3 , Satoshi Endo 1 , Tami Toto 1 , and Heng Xiao 2 1 Brookhaven National Laboratory 2 Pacific Northwest National Laboratory 3 University of California Los Angeles 4 NASA Jet Propulsion Laboratory And TONS of people from the rest of ARM! LASSO Webpage: http://www.arm.gov/science/themes/lasso LASSO e-mail list sign up:

  8. LEM-CF Premixed Tool Kit

    Energy Science and Technology Software Center (OSTI)

    2015-01-19

    The purpose of LEM-CF Premixed Tool Kit is to process premixed flame simulation data from the LEM-CF solver (https://fileshare.craft-tech.com/clusters/view/lem-cf) into a large-eddy simulation (LES) subgrid model database. These databases may be used with a user-defined-function (UDF) that is included in the Tool Kit. The subgrid model UDF may be used with the ANSYS FLUENT flow solver or other commercial flow solvers.

  9. EC Publications

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    LES- Abstract admin 2016-04-18T20:58:24+00:00 Popular Downloads Solar Energy Grid Integration Systems: Final Report of the Florida Solar Energy Center Team (11368 downloads) Modeling System Losses in PVsyst (9346 downloads) Numerical Manufacturing And Design Tool (NuMAD v2.0) for Wind Turbine Blades: User's Guide (7614 downloads) Solar Energy Grid Integration Systems (SEGIS) Proactive Intelligent Advances for Photovoltaic Systems (6676 downloads) Improved Test Method to Verify the Power Rating

  10. EC Publications

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    LES admin 2016-04-18T20:58:24+00:00 Popular Downloads Solar Energy Grid Integration Systems: Final Report of the Florida Solar Energy Center Team (11368 downloads) Modeling System Losses in PVsyst (9346 downloads) Numerical Manufacturing And Design Tool (NuMAD v2.0) for Wind Turbine Blades: User's Guide (7614 downloads) Solar Energy Grid Integration Systems (SEGIS) Proactive Intelligent Advances for Photovoltaic Systems (6676 downloads) Improved Test Method to Verify the Power Rating of a

  11. A simple Analytical Model to Study and Control Azimuthal Instabilities in

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Annular Combustion Chambers | Argonne Leadership Computing Facility A simple Analytical Model to Study and Control Azimuthal Instabilities in Annular Combustion Chambers Authors: Parmentier, J-F., Salas, P., Wolf, P., Staffelbach, G., Nicoud, F., Poinsot, T. This study describes a simple analytical method to compute the azimuthal modes appearing in annular combustion chambers and help analyzing experimental, acoustic and large eddy simulation (LES) data obtained in these combustion chambers.

  12. Practical application of large eddy simulation to film cooling flow analysis on gas turbine airfoils

    SciTech Connect (OSTI)

    Takata, T.; Takeishi, K.; Kawata, Y.; Tsuge, A.

    1999-07-01

    Large eddy simulation (LES) using body-fitted coordinates is applied to solve film cooling flow on turbine blades. The turbulent model was tuned using the experimental flow field and adiabatic film cooling effectiveness measurements for a single row of holes on a flat plate surface. The results show the interaction between the main stream boundary layer and injected film cooling air generates kidney and horseshoe shaped vortices. Comparison of the temperature distribution between experimental results and present analysis has been conducted. The non-dimensional temperature distribution at x/d = 1 is dome style and quantitatively agrees with experimental results. LES was also applied to solve film cooling on a turbine airfoil. If LES was applied to solve whole flow field domain large CPU time would make the solution impractical. LES, using body-fitted coordinates, is applied to solve the non-isotropic film cooling flow near the turbine blade. The cascade flow domain, with a pitch equal to one film cooling hole spacing, is solved using {kappa}-{epsilon} model. By using such a hybrid numerical method, CPU time is reduced and numerical accuracy is insured. The analytical results show the interaction between the flow blowing through film cooling holes and mainstream on the suction and pressure surfaces of the turbine airfoil. They also show the fundamental structure of the film cooling air flow is governed by arch internal secondary flow and horseshoe vortices which have a similar structure to film cooling air flow blowing through a cooling hole on a flat plate. In the flow field, the effect of turbulent structure on curvature (relaminarization) and flow pattern, involving the interaction between main flow and the cooling jet, are clearly shown. Film cooling effectiveness on the blade surface is predicted from the results of the thermal field calculation and is compared with the test result.

  13. Subgrid models for mass and thermal diffusion in turbulent mixing

    SciTech Connect (OSTI)

    Sharp, David H; Lim, Hyunkyung; Li, Xiao - Lin; Gilmm, James G

    2008-01-01

    We are concerned with the chaotic flow fields of turbulent mixing. Chaotic flow is found in an extreme form in multiply shocked Richtmyer-Meshkov unstable flows. The goal of a converged simulation for this problem is twofold: to obtain converged solutions for macro solution features, such as the trajectories of the principal shock waves, mixing zone edges, and mean densities and velocities within each phase, and also for such micro solution features as the joint probability distributions of the temperature and species concentration. We introduce parameterized subgrid models of mass and thermal diffusion, to define large eddy simulations (LES) that replicate the micro features observed in the direct numerical simulation (DNS). The Schmidt numbers and Prandtl numbers are chosen to represent typical liquid, gas and plasma parameter values. Our main result is to explore the variation of the Schmidt, Prandtl and Reynolds numbers by three orders of magnitude, and the mesh by a factor of 8 per linear dimension (up to 3200 cells per dimension), to allow exploration of both DNS and LES regimes and verification of the simulations for both macro and micro observables. We find mesh convergence for key properties describing the molecular level of mixing, including chemical reaction rates between the distinct fluid species. We find results nearly independent of Reynolds number for Re 300, 6000, 600K . Methodologically, the results are also new. In common with the shock capturing community, we allow and maintain sharp solution gradients, and we enhance these gradients through use of front tracking. In common with the turbulence modeling community, we include subgrid scale models with no adjustable parameters for LES. To the authors' knowledge, these two methodologies have not been previously combined. In contrast to both of these methodologies, our use of Front Tracking, with DNS or LES resolution of the momentum equation at or near the Kolmogorov scale, but without resolving the

  14. Inauguration LEP

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG H.Schopper salue le président de la république française, F.Mitterand, le président de la confédaration suisse P.Aubert, ainsi que les ministres et représentants du gouvernement des 12 états membres pour la célébration et inauguration du LEP.

  15. ARM - Facility News Article

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    7, 2016 [Facility News] Atmospheric Modeling Advisory Group Assembled Bookmark and Share ARM recently formed the Atmospheric Modeling Advisory Group to represent research community interests and provide feedback to the LES ARM Symbiotic Simulation and Observation Workflow (LASSO) modeling project. This group consists of six scientists, spanning the range of specialties that will benefit from LASSO, plus ARM Technical Director, Jim Mather; LASSO principal investigator, William Gustafson; and

  16. Partager : des technologies de pointe au service de la société

    ScienceCinema (OSTI)

    None

    2011-10-06

    Médecine, climatologie, métrologie et informatique, les techniques utilisées par le LHC trouvent déjà des répercussions dans d?autres domaines scientifiques. Utilisant des techniques inédites, la physique des particules en fait bénéficier la société toute entière.

  17. 1

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Expression for Critical Radius and Generalization to Consider Spectral Dispersion Y Liu, P. H. Daum, and R. Mcraw Environmental Sciences Department Brookhaven National Laboratory Upton, New York Introduction Representation of cloud and precipitation processes is crucial for improving atmospheric models of various scales ranging from large eddy simulations (LES) to cloud resolving models (CRMs) to global climate models (GCMs) (Stokes and Schwartz 1994). A key process that must be parameterized is

  18. 1

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    LES Simulations of Roll Clouds Observed During Mixed- Phase Arctic Cloud Experiment S.D. Greenberg and J Y. Harrington The Pennsylvania State University Department of Meteorology University Park, Pennsylvania A. Prenni and P. DeMott Colorado State University Fort Collins, Colorado Introduction Roll clouds and associated roll convection, are fairly common features of the atmospheric boundary layer. While these organized cumuliform clouds are found over many regions of the planet, they are quite

  19. Large-Eddy Simulation of the Bachalo-Johnson Flow, with Shock-Induced

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Separation | Argonne Leadership Computing Facility Instantaneous numerical Schlieren (contours of magnitude of the density gradient) from wall-modeled LES (WMLES) of the transonic Gaussian-shaped 2D bump on a flat plate. Coordinates are given in meters. Credit: Kirill Belyaev, Andrey Garbaruk, Michael Shur, Michael Strelets, and Andrey Travin, New Technologies and Services, Ltd. Large-Eddy Simulation of the Bachalo-Johnson Flow, with Shock-Induced Separation PI Name: Philippe Spalart PI

  20. Sample Projects - Combustion Energy Frontier Research Center

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Sample Projects Sample Projects These are only a few of the many possible research directions for Combustion Energy Research Fellows. For a more complete view on possible CEFRC postdoctoral research projects and collaborations please contact the Center Principal Investigators individually. Advanced Combustion Simulations with Dr. Jacqueline H. Chen and Prof. D. Haworth DNS/LES simulations with Prof. Stephen B. Pope and Dr. Jacqueline H. Chen. Simulations of experimental flames with Prof. Fokion

  1. 5. international workshop on the identification of transcribed sequences

    SciTech Connect (OSTI)

    1995-12-31

    This workshop was held November 5--8, 1995 in Les Embiez, France. The purpose of this conference was to provide a multidisciplinary forum for exchange of state-of-the-art information on mapping the human genome. Attention is focused on the following topics: transcriptional maps; functional analysis; techniques; model organisms; and tissue specific libraries and genes. Abstracts are included of the papers that were presented.

  2. Numerical simulation of the flow in wire-wrapped pin bundles: Effect of

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    pin-wire contact modeling | Argonne Leadership Computing Facility simulation of the flow in wire-wrapped pin bundles: Effect of pin-wire contact modeling Authors: Merzari, E., Smith, J.G., Tentner, A., Pointer, W.D., Fischer, P. The rapid advancement of numerical techniques and the availability of increasingly powerful supercomputers recently enabled scientists to use large eddy simulation (LES) to simulate numerically the flow in a full subassembly composed of wire-wrapped pins. Because of

  3. 25th Birthday Cern- Amphi

    ScienceCinema (OSTI)

    None

    2011-04-25

    Cérémonie du 25ème anniversaire du Cern avec 2 orateurs: le Prof.Weisskopf parle de la signification et le rôle du Cern et le Prof.Casimir(?) fait un exposé sur les rélations entre la science pure et la science appliquée et la "big science" (science légère)

  4. ARM Dev Workshop Plenary Presentation Gustafson 201507.pptx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Development of the LES ARM Symbiotic Simulation and Observation (LASSO) Workflow William I. Gustafson, Principal Investigator Pacific Northwest National Laboratory Andrew M. Vogelmann, Co-principal Investigator Brookhaven National Laboratory January 2014 Measurement Strategy Large-Eddy Simulation Scale (1 to 200 m) Cloud-Resolving Model Scale (1 to 4 km) Mesoscale Model Scale (4 to 20 km) Single-Column Model (100 km) General Circulation Model Scale (10 to 100 km, NCEP/ ECMWF Forcing) ARM

  5. Sibendu Som | Argonne National Laboratory

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Sibendu Som Principal Mechanical Engineer News Engine design takes a major leap at Argonne The complex chemistry of combustion Argonne, Achates Power and Delphi Automotive to investigate new approach to engines E-mail ssom@anl.gov Website Google Scholar Projects Combustion Modeling with Detailed Chemistry Effect of Nozzle Orifice Geometry Fuel Spray Modeling High-Fidelity Large Eddy Simulations (LES) Multi-Dimensional Modeling Simulation Approaches for Drop-in Biofuels Virtual Engine Research

  6. Simulation of Post-Frontal Boundary Layers Observed During the ARM 2000 Cloud IOP

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Simulation of Post-Frontal Boundary Layers Observed During the ARM 2000 Cloud IOP D. B. Mechem and Y. L. Kogan Cooperative Institute for Mesoscale Meteorological Studies University of Oklahoma Norman, Oklahoma M. Poellot University of North Dakota Grand Forks, North Dakota Introduction Large-eddy simulation (LES) models have been widely employed in the study of radiatively forced cloud topped boundary layers (CTBL). These boundary layers are typically well mixed and characterized by a sharp jump

  7. Microsoft PowerPoint - NMMSS Role in Preparing a New Facility for Reporting to the International Atomic Energy Agency_Gary Hirs

    National Nuclear Security Administration (NNSA)

    Role in Preparing a New Facility for Reporting to the International Atomic Energy Agency Gary Hirsch - NMMSS Purpose  This presentation covers the steps that NMMSS took to support the successful reporting to the IAEA by the U.S. Government for a new IAEA SELECT facility - LES owned and operated by URENCO USA  NMMSS reports import/export activity for ALL civilian nuclear materials to the IAEA  IAEA selected facilities have unique composition/facility code reporting requirements. 2

  8. Senior Staff Meeting

    ScienceCinema (OSTI)

    None

    2011-04-25

    Herbert Lengler fait l'introduction et remercie le DG, les directeurs et le vice président de l'association du personnel pour leur présence. Il parlera des activités depuis la dernière réunion et fera des commentaires sur l'"Abragam Commitee Final Report". Une discussion suivra sur plusieurs points importants.

  9. Combustion Energy Frontier Research Center Post-Doctoral Position in Advanced Combustion Simulations

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Energy Frontier Research Center (CEFRC) seeks outstanding applicants for the position of post-doctoral research associate to perform research at Cornell University and Sandia National Laboratories on advanced simulations of turbulent combustion. This position is as a Combustion Energy Research Fellow, as described at http://pcl.princeton.edu/efrc/fellow_Flyer.html . The project involves two simulation methodologies: direct numerical simulation (DNS); and large-eddy simulation (LES) using the

  10. Combustion Energy Frontier Research Center Post-Doctoral Position in Advanced Combustion Simulations

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    EFRC seeks outstanding applicants for the position of post-doctoral research associate to perform research at Cornell University and Sandia National Laboratories on advanced simulations of turbulent combustion. The project involves two simulation methodologies: direct numerical simulation (DNS); and large-eddy simulation (LES) using the filtered density function (FDF) approach. DNS involves minimal modeling, but is restricted (by computational capabilities) to simple geometries and a moderate

  11. Researchers develop a new mathematical tool for analyzing and evaluating

    National Nuclear Security Administration (NNSA)

    nuclear material | National Nuclear Security Administration | (NNSA) Researchers develop a new mathematical tool for analyzing and evaluating nuclear material Friday, January 8, 2016 - 12:00am Lawrence Livermore National Laboratory scientist Les Nakae, front, shows off a liquid scintillator detector for measuring neutrons and gamma rays with nanosecond timing, which requires the new theoretical formulations detailed in a recent research paper. Joining him are team members, from left: Neal

  12. Applications of large-eddy simulation: Synthesis of neutral boundary layer models

    SciTech Connect (OSTI)

    Ohmstede, W.D.

    1987-12-01

    The object of this report is to describe progress made towards the application of large-eddy simulation (LES), in particular, to the study of the neutral boundary layer (NBL). The broad purpose of the study is to provide support to the LES project currently underway at LLNL. The specific purpose of this study is to lay the groundwork for the simulation of the SBL through the establishment and implementation of model criteria for the simulation of the NBL. The idealistic NBL is never observed in the atmosphere and therefore has little practical significance. However, it is of considerable theoretical interest for several reasons. The report discusses the concept of Rossby-number similarity theory as it applies to the NBL. A particular implementation of the concept is described. Then, the results from prior simulations of the NBL are summarized. Model design criteria for two versions of the Brost LES (BLES) model are discussed. The general guidelines for the development of Version 1 of the Brost model (BV1) were to implement the model with a minimum of modifications which would alter the design criteria as established by Brost. Two major modifications of BLES incorporated into BV1 pertain to the initialization/parameterization of the model and the generalization of the boundary conditions at the air/earth interface. 18 refs., 4 figs.

  13. Fibre optique à la maison en Pays de Gex et de Bellegarde

    ScienceCinema (OSTI)

    None

    2011-10-06

    Le Syndicat Intercommunal d’Electricité de l’Ain(SIEA) déploie un réseau FTTH (Fiber To The Home) de fibres optiques dans le département de l’Ain vers l’ensemble des habitations. Le déploiement sur la zone pilote du Pays de Gex et du Bassin Bellegardien arrive dans la phase terminale vers les habitations. Le SIEA présentera ses activités, l’état du développement du réseau, les implications d’une connexion fibre optique et les procédures d’abonnement. La présentation sera donnée en Français. -------------------------------------------------------------------------------------------------------------------------------Public conference "Optical fiber To The Home in Pays de Gex et de Bellegarde" Michel Chanel et Jean Paul Goy (SIEA) Wednesday, 19th May at 11.30 hrs., Council Chamber, CERN The ‘’ Syndicat Intercommunal d’Electricité de l’Ain’’(SIEA) is deploying an optical fiber network FTTH (Fiber To The Home) in the Ain department towards the ensemble of houses. The installation on the pilot areas of Pays de Gex and Bassin Bellegardien is arriving in the phase of connecting houses. The SIEA will show its activities, the state of the network development, the implications of an optical fiber connection and the contract procedures. The presentation will be given in French

  14. RACORO continental boundary layer cloud investigations. 2. Large-eddy simulations of cumulus clouds and evaluation with in-situ and ground-based observations

    SciTech Connect (OSTI)

    Endo, Satoshi; Fridlind, Ann M.; Lin, Wuyin; Vogelmann, Andrew M.; Toto, Tami; Ackerman, Andrew S.; McFarquhar, Greg M.; Jackson, Robert C.; Jonsson, Haflidi H.; Liu, Yangang

    2015-06-19

    A 60-hour case study of continental boundary layer cumulus clouds is examined using two large-eddy simulation (LES) models. The case is based on observations obtained during the RACORO Campaign (Routine Atmospheric Radiation Measurement [ARM] Aerial Facility [AAF] Clouds with Low Optical Water Depths [CLOWD] Optical Radiative Observations) at the ARM Climate Research Facility's Southern Great Plains site. The LES models are driven by continuous large-scale and surface forcings, and are constrained by multi-modal and temporally varying aerosol number size distribution profiles derived from aircraft observations. We compare simulated cloud macrophysical and microphysical properties with ground-based remote sensing and aircraft observations. The LES simulations capture the observed transitions of the evolving cumulus-topped boundary layers during the three daytime periods, and generally reproduce variations of droplet number concentration with liquid water content (LWC), corresponding to the gradient between the cloud centers and cloud edges at given heights. The observed LWC values fall within the range of simulated values; the observed droplet number concentrations are commonly higher than simulated, but differences remain on par with potential estimation errors in the aircraft measurements. Sensitivity studies examine the influences of bin microphysics versus bulk microphysics, aerosol advection, supersaturation treatment, and aerosol hygroscopicity. Simulated macrophysical cloud properties are found to be insensitive in this non-precipitating case, but microphysical properties are especially sensitive to bulk microphysics supersaturation treatment and aerosol hygroscopicity.

  15. RACORO continental boundary layer cloud investigations. 2. Large-eddy simulations of cumulus clouds and evaluation with in-situ and ground-based observations

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Endo, Satoshi; Fridlind, Ann M.; Lin, Wuyin; Vogelmann, Andrew M.; Toto, Tami; Ackerman, Andrew S.; McFarquhar, Greg M.; Jackson, Robert C.; Jonsson, Haflidi H.; Liu, Yangang

    2015-06-19

    A 60-hour case study of continental boundary layer cumulus clouds is examined using two large-eddy simulation (LES) models. The case is based on observations obtained during the RACORO Campaign (Routine Atmospheric Radiation Measurement [ARM] Aerial Facility [AAF] Clouds with Low Optical Water Depths [CLOWD] Optical Radiative Observations) at the ARM Climate Research Facility's Southern Great Plains site. The LES models are driven by continuous large-scale and surface forcings, and are constrained by multi-modal and temporally varying aerosol number size distribution profiles derived from aircraft observations. We compare simulated cloud macrophysical and microphysical properties with ground-based remote sensing and aircraft observations.more » The LES simulations capture the observed transitions of the evolving cumulus-topped boundary layers during the three daytime periods, and generally reproduce variations of droplet number concentration with liquid water content (LWC), corresponding to the gradient between the cloud centers and cloud edges at given heights. The observed LWC values fall within the range of simulated values; the observed droplet number concentrations are commonly higher than simulated, but differences remain on par with potential estimation errors in the aircraft measurements. Sensitivity studies examine the influences of bin microphysics versus bulk microphysics, aerosol advection, supersaturation treatment, and aerosol hygroscopicity. Simulated macrophysical cloud properties are found to be insensitive in this non-precipitating case, but microphysical properties are especially sensitive to bulk microphysics supersaturation treatment and aerosol hygroscopicity.« less

  16. FOSTERING MULTI-LATERAL COOPERATION BETWEEN THE GOVERNMENTS OF MEXICO, COLOMBIA, AND THE UNITED STATES TO ENHANCE THE PROTECTION OF HIGH-ACTIVITY RADIOACTIVE SOURCES

    SciTech Connect (OSTI)

    Butler, Nicholas; Watson, Erica E.; Wright, Kyle A.

    2009-10-07

    The Global Threat Reduction Initiative (GTRI) reduces and protects vulnerable nuclear and radiological material located at civilian sites worldwide from sabotage, theft or diversion. The GTRI program has worked successfully with foreign countries to remove and protect nuclear and radioactive materials including high-activity sources used in medical, commercial, and research applications. There are many barriers to successful bilateral cooperation that must be overcome including language, preconceived perceptions, long distances, and different views on the threat and protection requirements. Successful cooperation is often based on relationships and building trusting relationships takes time. In the case of Mexico, GTRI first made contact in 2005. The project then lost momentum and stalled. At the same time, GTRI’s cooperation with the Republic of Colombia was a resounding success resulting in the securing of forty sites; the consolidation of numerous disused/orphan sources at a secure national storage facility; and, the development of a comprehensive approach to security including, inter alia, training and sustainability. The government of Colombia also showcased this comprehensive approach to thirteen Central American and Caribbean countries at a GTRI regional security conference held in Panama in October 2004. Representatives from the Colombian government were aware of GTRI’s interest in initiating cooperation with the Government of Mexico and to facilitate this cooperation, they offered to invite their Mexican counterparts to Colombia to observe its successful cooperation with GTRI. Shortly after that visit, the Government of Mexico agreed to move forward and requested that the cooperative efforts in Mexico be performed in a tripartite manner, leveraging the skills, experience, and resources of the Colombians. As a result, 22 of Mexico’s largest radioactive sites have had security upgrades in place within 18 months of cooperation.

  17. EIA cites importance of key world shipping routes

    SciTech Connect (OSTI)

    Not Available

    1994-03-07

    A disruption of crude oil or products shipments through any of six world chokepoints would cause a spike in oil prices, the US Energy Information Administration (EIA) warns. The strategic importance of each major shipping lane varies because of differing oil volumes and access to other transportation routes. But nearly half of the 66 million b/d of oil consumed worldwide flows through one or more of these key tanker routes, involving: 14 million b/d through the Strait of Hormuz from the Persian Gulf to the Gulf of Oman and Arabian Sea; 7 million b/d through the Strait of Malacca from the northern Indian Ocean into the South China Sea and Pacific Ocean; 1.6 million b/d through the Bosporus from the Black Sea to the Mediterranean Sea; 900,000 b/d through the Suez Canal from the Red Sea to the Mediterranean Sea; 600,000 b/d through Rotterdam Harbor from the North Sea to Dutch and German refineries on or near the Rhine River; and 500,000 b/d through the Panama Canal from the Pacific Ocean to the Caribbean Sea. In today's highly interdependent oil markets, the mere perception of less secure oil supplies is enough to boost oil prices, EIA said. Growing oil and product tanker traffic is increasing the likelihood of supply disruptions through oil arteries because of bad weather, tanker collisions, or acts of piracy, terrorism, or war. What's more, the increasing age of the world tanker fleet and dependability of navigational equipment could increase chances of accidents and, therefore, oil supply disruptions.

  18. Contrasting impacts of localised versus catastrophic oil spills in coastal wetlands

    SciTech Connect (OSTI)

    Burns, K.A.; Codi, S.

    1996-12-31

    A localised oil spill was observed on the wetland marshes bordering a tidal creek near Cairns, Queensland in January 1994. Pollution and conservation issues are of paramount public concern in this region which boarders World Heritage Areas of coral reefs and coastal habitats. Local residents observed oil being dumped from a truck which was contracted to of oil the surface of the roads in the contiguous sugar cane farm for dust control. During this incident several truckloads of mixed waste oil were dumped onto a short section of road and into the wetlands. The oil contaminated a band of marsh 15-30 m wide along approximately 200 m of road. Impacted marsh included Melaleuca forest on the high side of the road and intertidal mangroves on the seaward side. The Queensland Department of Environment (QDE) initiated an impact assessment and directed the trucking company to clean up impacted areas. The extent of damage to wetlands from oil spills is related to the amount and type of oil spilled and the sensitivity of the habitats oiled. QDE asked the Australian Institute of Marine Sciences to assist with their study on the fate of the oil in this localised spill. The initial levels of petroleum hydrocarbons in surface sediments reached 17% of the dry weight in heavily impacted areas. Thus levels were similar to those reached after the catastrophic oil spill in Panama. Clean up efforts and natural dissipation processes reduced sediment hydrocarbon loads to nonacutely toxic levels in only 1.5 years in the intertidal mangroves. High levels remain in the Melaleuca sediments. We used internal molecular markers to detail hydrocarbon dissipation vs degradation. This study provides a contrast between impacts of localised versus catastrophic oil spills in deep mud coastal habitats.

  19. Physics Beyond the Standard Model: Supersymmetry

    SciTech Connect (OSTI)

    Nojiri, M.M.; Plehn, T.; Polesello, G.; Alexander, John M.; Allanach, B.C.; Barr, Alan J.; Benakli, K.; Boudjema, F.; Freitas, A.; Gwenlan, C.; Jager, S.; /CERN /LPSC, Grenoble

    2008-02-01

    This collection of studies on new physics at the LHC constitutes the report of the supersymmetry working group at the Workshop 'Physics at TeV Colliders', Les Houches, France, 2007. They cover the wide spectrum of phenomenology in the LHC era, from alternative models and signatures to the extraction of relevant observables, the study of the MSSM parameter space and finally to the interplay of LHC observations with additional data expected on a similar time scale. The special feature of this collection is that while not each of the studies is explicitly performed together by theoretical and experimental LHC physicists, all of them were inspired by and discussed in this particular environment.

  20. Nek5000 Ready to Use after Simulations of Important Pipe Flow Benchmark |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Nek5000 Ready to Use after Simulations of Important Pipe Flow Benchmark Nek5000 Ready to Use after Simulations of Important Pipe Flow Benchmark January 29, 2013 - 1:42pm Addthis Velocity magnitude in MATiS-H spacer grid with swirl-type vanes. Velocity magnitude in MATiS-H spacer grid with swirl-type vanes. As part of the on-going Nek5000 validation efforts, a series of large eddy simulations (LES) have been performed for thermal stratification in a pipe. Results were in

  1. Community Energy Strategic Planning - Step 10

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    (What a nd why) Final steps for the CESP include: Preparing a final report, which will outline where the community stands, promote the vision and goals for the future, and illustrate to the public the usefulness of funding its acLviLes. Formal adopLon of the CESP, which provides the official recogniLon needed to serve as guidance for future acLons and gives the CESP the weight of authority for future budgeLng and other associated planning efforts. Planning for ongoing public outreach, which will

  2. Formation and Sustainment of ITPs in ITER with the Baseline Heating Mix

    SciTech Connect (OSTI)

    Francesca M. Poli and Charles Kessel

    2012-12-03

    Plasmas with internal transport barriers (ITBs) are a potential and attractive route to steady-state operation in ITER. These plasmas exhibit radially localized regions of improved con nement with steep pressure gradients in the plasma core, which drive large bootstrap current and generate hollow current pro les and negative shear. This work examines the formation and sustainment of ITBs in ITER with electron cyclotron heating and current drive. It is shown that, with a trade-o of the power delivered to the equatorial and to the upper launcher, the sustainment of steady-state ITBs can be demonstrated in ITER with the baseline heating con guration.

  3. ARM - Evaluation Product - LASSO Alpha 1 Data Bundles

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ProductsLASSO Alpha 1 Data Bundles ARM Data Discovery Browse Data Documentation Use the Data File Inventory tool to view data availability at the file level. Comments? We would love to hear from you! Send us a note below or call us at 1-888-ARM-DATA. Send Evaluation Product : LASSO Alpha 1 Data Bundles [ ARM research - evaluation data product ] The Alpha 1 release contains initial data bundles from the large-eddy simulation (LES) ARM Symbiotic Simulation and Observation (LASSO) workflow pilot

  4. Coupling a Mesoscale Numerical Weather Prediction Model with Large-Eddy Simulation for Realistic Wind Plant Aerodynamics Simulations (Poster)

    SciTech Connect (OSTI)

    Draxl, C.; Churchfield, M.; Mirocha, J.; Lee, S.; Lundquist, J.; Michalakes, J.; Moriarty, P.; Purkayastha, A.; Sprague, M.; Vanderwende, B.

    2014-06-01

    Wind plant aerodynamics are influenced by a combination of microscale and mesoscale phenomena. Incorporating mesoscale atmospheric forcing (e.g., diurnal cycles and frontal passages) into wind plant simulations can lead to a more accurate representation of microscale flows, aerodynamics, and wind turbine/plant performance. Our goal is to couple a numerical weather prediction model that can represent mesoscale flow [specifically the Weather Research and Forecasting model] with a microscale LES model (OpenFOAM) that can predict microscale turbulence and wake losses.

  5. Inauguration LEP

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG C.Rubbia remercie son prédécesseur H.Schopper pour sa contribution pour la réalisation du LEP. En présence du président de la Confédération Suisse, Mons. Délamuraz et du président français Mons.Mitterand plusieurs discours sont donnés et les délégations invités pour un déjeuner.

  6. Quantifying the Uncertainties of Aerosol Indirect Effects and Impacts on Decadal-Scale Climate Variability in NCAR CAM5 and CESM1

    SciTech Connect (OSTI)

    Park, Sungsu

    2014-12-12

    The main goal of this project is to systematically quantify the major uncertainties of aerosol indirect effects due to the treatment of moist turbulent processes that drive aerosol activation, cloud macrophysics and microphysics in response to anthropogenic aerosol perturbations using the CAM5/CESM1. To achieve this goal, the P.I. hired a postdoctoral research scientist (Dr. Anna Fitch) who started her work from the Nov.1st.2012. In order to achieve the project goal, the first task that the Postdoc. and the P.I. did was to quantify the role of subgrid vertical velocity variance on the activation and nucleation of cloud liquid droplets and ice crystals and its impact on the aerosol indirect effect in CAM5. First, we analyzed various LES cases (from dry stable to cloud-topped PBL) to check whether this isotropic turbulence assumption used in CAM5 is really valid. It turned out that this isotropic turbulence assumption is not universally valid. Consequently, from the analysis of LES, we derived an empirical formulation relaxing the isotropic turbulence assumption used for the CAM5 aerosol activation and ice nucleation, and implemented the empirical formulation into CAM5/CESM1, and tested in the single-column and global simulation modes, and examined how it changed aerosol indirect effects in the CAM5/CESM1. These results were reported in the poster section in the 18th Annual CESM workshop held in Breckenridge, CO during Jun.17-20.2013. While we derived an empirical formulation from the analysis of couple of LES from the first task, the general applicability of that empirical formulation was questionable, because it was obtained from the limited number of LES simulations. The second task we did was to derive a more fundamental analytical formulation relating vertical velocity variance to TKE using other information starting from basic physical principles. This was a somewhat challenging subject, but if this could be done in a successful way, it could be directly

  7. OneTouch 4.0 Scanned Documents

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    ....... ~~ ~~ -""~ - - - =-.- ~- ~ ----- ---- --- - - ~ - Stephen A. Whipple Lynn H. Wellman and Bill J. Good A Publication of the Savannah River Plant National Environmental Research Park Program United States Department of Energy a Th is report was prepared a s a n ac count of work sponsored by th e United States Governme nt. Neither the Un ited Slate s nor the United Sta les D~ - par trncnt of Energy. nor any of th eir co ntrac tors. su bco ntrac to rs. or th eir e mployees. mak es

  8. New Measurements of the Cosmic Background Radiation Spectrum

    DOE R&D Accomplishments [OSTI]

    Smoot, G. F.; De Amici, G.; Levin, S.; Witebsky, C.

    The Sandia Laboratories` participation in Quality Assurance programs for Radioisotopic Thermoelectric Generators which have been used in space systems over the past 10 years is summarized. Basic elements of this QA program are briefly described and recognition of assistance from other Sandia organizations is included. Descriptions of the various systems for which Sandia has had the QA responsibility are presented, including SNAP 19 (Nimbus, Pioneer, Viking), SNAP 27 (Apollo), Transit, Multi Hundred Watt (LES 8/9 and MJS), and a new program, High Performance Generator Mod 3. The outlook for Sandia participation in RTG programs for the next several years is noted.

  9. Generation and characterization of electron bunches with ramped current profile at the FLASH facility

    SciTech Connect (OSTI)

    Piot, P.; Behrens, C.; Gerth, C.; Lemery, F.; Mihalcea, D.; Vogt, M.; /DESY

    2011-09-01

    We report on the successful generation of electron bunches with current prof les that have a quasi-linear dependency on the longitudinal coordinate. The technique relies on impressing nonlinear correlations in the longitudinal phase space using a linac operating at two frequencies (1.3 and 3.9 GHz) and a bunch compressor. Data taken for various accelerator settings demonstrate the versatility of the method. The produced bunches have parameters well matched to drive high-gradient accelerating field with enhanced transformer ratio in beam-driven accelerators based on sub-mm-sizes dielectric or plasma structures.

  10. Microsoft Word - FAQs _Spanish_ 1-22-10b WITH NEW EDITS mk 01-26-10.doc

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Borrador de la Declaración Sobre el Impacto Ambiental del Cierre de Contenedores y la Disposición de Desechos del Establecimiento de Hanford, Richland, Washington (Borrador de la DIA CC & DD) (DOE/EIS-0391-D) Preguntas Frecuentes ¿Cuáles son las propuestas de acción del Departamento de Energía de los Estados Unidos (DDE) (U.S. Department of Energy) en el Borrador de la DIA CC & DD (Draft Tank Closure and Waste Management Environmental Impact Statement for the Hanford Site,

  11. Ceremony 25th birthday Cern

    ScienceCinema (OSTI)

    None

    2011-04-25

    Célébration du 25ème anniversaire du Cern (jour par jour) avec discours de L.Van Hove et J.B.Adams, des interludes musicals offerts par Mme Mey et ses collègues (au debut 1.mouvement du quatuor avec piano no 3 de L.van Beethoven) Les directeurs généraux procéderont à la remise du souvenir aux membres de personnel ayant 25 années de service dans l'organisation. Un témoignage de reconnaissance est auss fait à l'interprète Mme Zwerner

  12. Microsoft Word - 599-16june.docx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    NURETH14-599 PROGRESS IN THE PREDICTION OF NON-UNITY PRANDTL-NUMBER TURBULENT FLOWS USING TransAT D. Lakehal, J. Panyasantisuk, D. Caviezel, M. Labois and C. Narayanan ASCOMP GmbH, Zurich, Switzerland lakehal@ascomp.ch; Lakehal@ascomp.ch Abstract We report LES results of the flow and convective heat transfer in a heated channel at a wall shear Reynolds number of Re  = 150 and 171. The results are compared with available DNS data for various Prandtl number fluids (Pr = 0.1-10). In order

  13. Eia.gov BETA - Data - U.S. Energy Information Administration (EIA)

    U.S. Energy Information Administration (EIA) Indexed Site

    Tableau croisé des definitions English FranÇais Español A B C D E É F G H I J K L M N O P Q R S T U V W X Y Z Parcourir les termes liés aux catégories suivantes: pétrole brut et équivalents liquides de gaz naturel additifs et composés oxygénés Produits pétroliers gaz naturel biocarburant électricité Consultez l'index des termes

  14. Slide 1

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    MiniBooNE Alexis A. Aguilar-Arévalo for the MiniBooNE Collaboration February 25, 2008 Les Rencontres de Physique de la Vallée d'Aoste Alexis Aguilar-Arévalo Rencontres de Physique de la Vallée d'Aoste Feb 25, 2008 1 Outline 1. Motivation 2. Description of the Experiment 3. Oscillation analysis 4. Results 5. Future plans 6. Summary 2 Alexis Aguilar-Arévalo Rencontres de Physique de la Vallée d'Aoste Feb 25, 2008 University of Alabama Los Alamos National Laboratory Bucknell University

  15. Cloud feedback studies with a physics grid

    SciTech Connect (OSTI)

    Dipankar, Anurag; Stevens, Bjorn

    2013-02-07

    During this project the investigators implemented a fully parallel version of dual-grid approach in main frame code ICON, implemented a fully conservative first-order interpolation scheme for horizontal remapping, integrated UCLA-LES micro-scale model into ICON to run parallely in selected columns, and did cloud feedback studies on aqua-planet setup to evaluate the classical parameterization on a small domain. The micro-scale model may be run in parallel with the classical parameterization, or it may be run on a "physics grid" independent of the dynamics grid.

  16. Conference Talks

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Conference Talks 1-2 Michael Borland 1-4 Weiming Guo 2-2 Robert Rossmanith 3-3 Gwyn Williams 4-1 Robert Austin 5-2 James Ablett 5-5 Peter Revesz 8-1 Peter Siddons 9-4 Ying Zhu 10-1 Michael Nasse 10-3 Gary Findley Workshop 1 Overview of Beam size measurements - Jeff Corbett Beam size measurements at CAMD - Victor Suller Beam Size Measurements at the Canadian LS - Les Dallin Pinhole Cameras – Operation and Analysis - Jeff Corbett and Jack Bergstrom New Crystal Collimator for Source Size

  17. FOSTERING MULTI-LATERAL COOPERATION BETWEEN THE GOVERNMENTS OF DOMINICAN REPUBLIC, COLOMBIA, AND THE UNITED STATES TO ENHANCE THE PROTECTION OF HIGH-ACTIVITY RADIOACTIVE SOURCES

    SciTech Connect (OSTI)

    Butler, Nicholas; McCaw, Erica E.; Wright, Kyle A.; Medina, Maximo

    2009-10-06

    The Global Threat Reduction Initiative (GTRI) reduces and protects vulnerable nuclear and radiological material located at civilian sites worldwide from sabotage, theft or diversion. The GTRI has worked successfully with foreign countries to remove and protect nuclear and radioactive materials including high-activity sources used in medical, commercial, and research applications. There are many barriers to successful bilateral cooperation that must be overcome including language, preconceived perceptions, long distances, and different views on the threat and protection requirements. Successful cooperation is often based on relationships and building trusting relationships takes time. In the case of Dominican Republic, the GTRI first received contact in 2008 from the Government of Dominican Republic. They requested cooperation that was similar to the tri-partite cooperation between Colombia, Mexico and the United States. Throughout the region it was widely known that the GTRI’s cooperation with the Government of Colombia was a resounding success resulting in the securing of forty sites; the consolidation of numerous disused/orphan sources at a secure national storage facility; and, the development of a comprehensive approach to security including, inter alia, training and sustainability. The Government of Colombia also showcased this comprehensive approach to thirteen Central American and Caribbean countries at a GTRI regional security conference held in Panama in October 2004. In 2007, Colombia was an integral component of GTRI multi-lateral cooperation initiation in Mexico. As a result, twenty two of Mexico’s largest radioactive sites have been upgraded in the past eighteen months. These two endeavors served as catalysts for cooperation opportunities in the Dominican Republic. Representatives from the Colombian government were aware of GTRI’s interest in initiating cooperation with the Government of Dominican Republic and to facilitate this cooperation, they

  18. Investigation of Rossby-number similarity in the neutral boundary layer using large-eddy simulation

    SciTech Connect (OSTI)

    Ohmstede, W.D.; Cederwall, R.T.; Meyers, R.E.

    1988-01-01

    One special case of particular interest, especially to theoreticians, is the steady-state, horizontally homogeneous, autobarotropic (PLB), hereafter referred to as the neutral boundary layer (NBL). The NBL is in fact a 'rare' atmospheric phenomenon, generally associated with high-wind situations. Nevertheless, there is a disproportionate interest in this problem because Rossby-number similarity theory provides a sound approach for addressing this issue. Rossby-number similarity theory has rather wide acceptance, but because of the rarity of the 'true' NBL state, there remains an inadequate experimental database for quantifying constants associated with the Rossby-number similarity concept. Although it remains a controversial issue, it has been proposed that large-eddy simulation (LES) is an alternative to physical experimentation for obtaining basic atmospherc 'data'. The objective of the study reported here is to investigate Rossby-number similarity in the NBL using LES. Previous studies have not addressed Rossby-number similarity explicitly, although they made use of it in the interpretation of their results. The intent is to calculate several sets of NBL solutions that are ambiguous relative to the their respective Rossby numbers and compare the results for similarity, or the lack of it. 14 refs., 1 fig.

  19. Drizzle production in stratocumulus

    SciTech Connect (OSTI)

    Feingold, G.; Frisch, A.S.; Stevens, B.; Cotton, W.R.

    1996-04-01

    Although stratocumulus clouds are not prodigious producers of precipitation, the small amounts of drizzle they do produce have an important impact on both cloud macrophysical properties (e.g., spatial coverage, depth and liquid water content) and microphysical properties (e.g., droplet size distributions, effective radii). The radiative effects of stratocumulus are intimately connected to both these macro- and microphysical properties, and it is thus essential that we understand the mechanisms of droplet growth which generate precipitation sized droplets. Drizzle production is closely related to cloud condensation nucleus (CCN) number and size, as well as to cloud dynamics and the ability of clouds to support droplets within their bounds and allow for repeated collision-coalesence cycles. In order to address both the microphysical and dynamical aspects of drizzle formation (and their close coupling), we have adapted a large eddy simulation (LES) model to include explicit (size-resolving) microphysical treatment of the CCN and droplet spectra. By directly calculating processes such as droplet growth by condensation and stochastic collection, evaporation, and sedimentation in the LES framework, we are in a position to elucidate the drizzle formation process.

  20. Petascale algorithms for reactor hydrodynamics.

    SciTech Connect (OSTI)

    Fischer, P.; Lottes, J.; Pointer, W. D.; Siegel, A.

    2008-01-01

    We describe recent algorithmic developments that have enabled large eddy simulations of reactor flows on up to P = 65, 000 processors on the IBM BG/P at the Argonne Leadership Computing Facility. Petascale computing is expected to play a pivotal role in the design and analysis of next-generation nuclear reactors. Argonne's SHARP project is focused on advanced reactor simulation, with a current emphasis on modeling coupled neutronics and thermal-hydraulics (TH). The TH modeling comprises a hierarchy of computational fluid dynamics approaches ranging from detailed turbulence computations, using DNS (direct numerical simulation) and LES (large eddy simulation), to full core analysis based on RANS (Reynolds-averaged Navier-Stokes) and subchannel models. Our initial study is focused on LES of sodium-cooled fast reactor cores. The aim is to leverage petascale platforms at DOE's Leadership Computing Facilities (LCFs) to provide detailed information about heat transfer within the core and to provide baseline data for less expensive RANS and subchannel models.

  1. Insights from modeling and observational evaluation of a precipitating continental cumulus event observed during the MC3E field campaign

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Mechem, David B.; Giangrande, Scott E.; Wittman, Carly S.; Borque, Paloma; Toto, Tami; Kollias, Pavlos

    2015-03-13

    A case of shallow cumulus and precipitating cumulus congestus sampled at the Atmospheric Radiation Measurement (ARM) Program Southern Great Plains (SGP) supersite is analyzed using a multi-sensor observational approach and numerical simulation. Observations from a new radar suite surrounding the facility are used to characterize the evolving statistical behavior of the precipitating cloud system. This is accomplished using distributions of different measures of cloud geometry and precipitation properties. Large-eddy simulation (LES) with size-resolved (bin) microphysics is employed to determine the forcings most important in producing the salient aspects of the cloud system captured in the radar observations. Our emphasis ismore » on assessing the importance of time-varying vs. steady-state large-scale forcing on the model's ability to reproduce the evolutionary behavior of the cloud system. Additional consideration is given to how the characteristic spatial scale and homogeneity of the forcing imposed on the simulation influences the evolution of cloud system properties. Results indicate that several new scanning radar estimates such as distributions of cloud top are useful to differentiate the value of time-varying (or at least temporally well-matched) forcing on LES solution fidelity.« less

  2. Improving Parameterization of Entrainment Rate for Shallow Convection with Aircraft Measurements and Large-Eddy Simulation

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Lu, Chunsong; Liu, Yangang; Zhang, Guang J.; Wu, Xianghua; Endo, Satoshi; Cao, Le; Li, Yueqing; Guo, Xiaohao

    2016-02-01

    This work examines the relationships of entrainment rate to vertical velocity, buoyancy, and turbulent dissipation rate by applying stepwise principal component regression to observational data from shallow cumulus clouds collected during the Routine AAF [Atmospheric Radiation Measurement (ARM) Aerial Facility] Clouds with Low Optical Water Depths (CLOWD) Optical Radiative Observations (RACORO) field campaign over the ARM Southern Great Plains (SGP) site near Lamont, Oklahoma. The cumulus clouds during the RACORO campaign simulated using a large eddy simulation (LES) model are also examined with the same approach. The analysis shows that a combination of multiple variables can better represent entrainment ratemore » in both the observations and LES than any single-variable fitting. Three commonly used parameterizations are also tested on the individual cloud scale. A new parameterization is therefore presented that relates entrainment rate to vertical velocity, buoyancy and dissipation rate; the effects of treating clouds as ensembles and humid shells surrounding cumulus clouds on the new parameterization are discussed. Physical mechanisms underlying the relationships of entrainment rate to vertical velocity, buoyancy and dissipation rate are also explored.« less

  3. Insights from modeling and observational evaluation of a precipitating continental cumulus event observed during the MC3E field campaign

    SciTech Connect (OSTI)

    Mechem, David B.; Giangrande, Scott E.; Wittman, Carly S.; Borque, Paloma; Toto, Tami; Kollias, Pavlos

    2015-03-13

    A case of shallow cumulus and precipitating cumulus congestus sampled at the Atmospheric Radiation Measurement (ARM) Program Southern Great Plains (SGP) supersite is analyzed using a multi-sensor observational approach and numerical simulation. Observations from a new radar suite surrounding the facility are used to characterize the evolving statistical behavior of the precipitating cloud system. This is accomplished using distributions of different measures of cloud geometry and precipitation properties. Large-eddy simulation (LES) with size-resolved (bin) microphysics is employed to determine the forcings most important in producing the salient aspects of the cloud system captured in the radar observations. Our emphasis is on assessing the importance of time-varying vs. steady-state large-scale forcing on the model's ability to reproduce the evolutionary behavior of the cloud system. Additional consideration is given to how the characteristic spatial scale and homogeneity of the forcing imposed on the simulation influences the evolution of cloud system properties. Results indicate that several new scanning radar estimates such as distributions of cloud top are useful to differentiate the value of time-varying (or at least temporally well-matched) forcing on LES solution fidelity.

  4. Flow topologies and turbulence scales in a jet-in-cross-flow

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Oefelein, Joseph C.; Ruiz, Anthony M.; Lacaze, Guilhem

    2015-04-03

    This study presents a detailed analysis of the flow topologies and turbulence scales in the jet-in-cross-flow experiment of [Su and Mungal JFM 2004]. The analysis is performed using the Large Eddy Simulation (LES) technique with a highly resolved grid and time-step and well controlled boundary conditions. This enables quantitative agreement with the first and second moments of turbulence statistics measured in the experiment. LES is used to perform the analysis since experimental measurements of time-resolved 3D fields are still in their infancy and because sampling periods are generally limited with direct numerical simulation. A major focal point is the comprehensivemore » characterization of the turbulence scales and their evolution. Time-resolved probes are used with long sampling periods to obtain maps of the integral scales, Taylor microscales, and turbulent kinetic energy spectra. Scalar-fluctuation scales are also quantified. In the near-field, coherent structures are clearly identified, both in physical and spectral space. Along the jet centerline, turbulence scales grow according to a classical one-third power law. However, the derived maps of turbulence scales reveal strong inhomogeneities in the flow. From the modeling perspective, these insights are useful to design optimized grids and improve numerical predictions in similar configurations.« less

  5. Flow topologies and turbulence scales in a jet-in-cross-flow

    SciTech Connect (OSTI)

    Oefelein, Joseph C.; Ruiz, Anthony M.; Lacaze, Guilhem

    2015-04-03

    This study presents a detailed analysis of the flow topologies and turbulence scales in the jet-in-cross-flow experiment of [Su and Mungal JFM 2004]. The analysis is performed using the Large Eddy Simulation (LES) technique with a highly resolved grid and time-step and well controlled boundary conditions. This enables quantitative agreement with the first and second moments of turbulence statistics measured in the experiment. LES is used to perform the analysis since experimental measurements of time-resolved 3D fields are still in their infancy and because sampling periods are generally limited with direct numerical simulation. A major focal point is the comprehensive characterization of the turbulence scales and their evolution. Time-resolved probes are used with long sampling periods to obtain maps of the integral scales, Taylor microscales, and turbulent kinetic energy spectra. Scalar-fluctuation scales are also quantified. In the near-field, coherent structures are clearly identified, both in physical and spectral space. Along the jet centerline, turbulence scales grow according to a classical one-third power law. However, the derived maps of turbulence scales reveal strong inhomogeneities in the flow. From the modeling perspective, these insights are useful to design optimized grids and improve numerical predictions in similar configurations.

  6. Conference on alternatives for pollution control from coal-fired low emission sources, Plzen, Czech Republic. Plzen Proceedings

    SciTech Connect (OSTI)

    Not Available

    1994-07-01

    The Conference on Alternatives for Pollution Control from Coal-Fired Emission Sources presented cost-effective approaches for pollution control of low emission sources (LES). It also identified policies and strategies for implementation of pollution control measures at the local level. Plzen, Czech Republic, was chosen as the conference site to show participants first hand the LES problems facing Eastern Europe today. Collectively, these Proceedings contain clear reports on: (a) methods for evaluating the cost effectiveness of alternative approaches to control pollution from small coal-fired boilers and furnaces; (b) cost-effective technologies for controlling pollution from coal-fired boilers and furnaces; (c) case studies of assessment of cost effective pollution control measures for selected cities in eastern Europe; and (d) approaches for actually implementing pollution control measures in cities in Eastern Europe. It is intended that the eastern/central European reader will find in these Proceedings useful measures that can be applied to control emissions and clean the air in his city or region. The conference was sponsored by the United States Agency for International Development (AID), the United States Department of Energy (DOE), and the Czech Ministry of Industry and Trade. Selected papers have been indexed separately for inclusion in the Energy Science and Technology Database.

  7. La supraconductivité a 100 ans !

    ScienceCinema (OSTI)

    None

    2011-10-06

    Il y a 100 ans, le 8 avril 1911, une découverte majeure était réalisée : celle de la supraconductivité. La supraconductivité est la caractéristique qu?ont certains métaux et alliages de perdre toute résistance électrique en dessous d?une température donnée. Cette renversante découverte, réalisée de manière presque fortuite par Kammerlingh Onnes de l?Université de Leyde (Pays-Bas) et son étudiant Gilles Holst, a ouvert un nouveau champ de recherche en physique et de fabuleuses perspectives d?applications technologiques. Du point de vue scientifique, la supraconductivité est en effet l?une des rares manifestations de la physique quantique à l?échelle macroscopique.  Du point de vue des retombées techniques, elle est porteuse d?applications majeures dans le domaine de la santé, des communications et de l?énergie. 100 ans après, les physiciens n?ont toujours pas fini d?explorer ce phénomène et ses applications. Le CERN abrite des applications de la supraconductivité à des échelles inédites. L?accélérateur de particules LHC, avec ses milliers d?aimants supraconducteurs répartis sur 27 kilomètres de circonférence, est en effet la plus grande application mondiale de la supraconductivité. Il ne pourrait exister sans elle.  Le CERN fête donc la découverte de la supraconductivité avec une conférence exceptionnelle donnée par Philippe Lebrun. Au cours de cette conférence, l?expérience historique de Kammerlingh Onnes sera reproduite. Philippe Lebrun racontera l?histoire de cette étonnante découverte, en la replaçant dans le contexte scientifique de l?époque. Il racontera les développements scientifiques et les applications du premier siècle de la supraconductivité. Conférence en français Merci de bien vouloir vous inscrire au : +41 22 767 76 76 ou cern.reception@cern.ch

  8. La supraconductivité a 100 ans !

    SciTech Connect (OSTI)

    2011-04-14

    Il y a 100 ans, le 8 avril 1911, une découverte majeure était réalisée : celle de la supraconductivité. La supraconductivité est la caractéristique qu’ont certains métaux et alliages de perdre toute résistance électrique en dessous d’une température donnée. Cette renversante découverte, réalisée de manière presque fortuite par Kammerlingh Onnes de l’Université de Leyde (Pays-Bas) et son étudiant Gilles Holst, a ouvert un nouveau champ de recherche en physique et de fabuleuses perspectives d’applications technologiques. Du point de vue scientifique, la supraconductivité est en effet l’une des rares manifestations de la physique quantique à l’échelle macroscopique.  Du point de vue des retombées techniques, elle est porteuse d’applications majeures dans le domaine de la santé, des communications et de l’énergie. 100 ans après, les physiciens n’ont toujours pas fini d’explorer ce phénomène et ses applications. Le CERN abrite des applications de la supraconductivité à des échelles inédites. L’accélérateur de particules LHC, avec ses milliers d’aimants supraconducteurs répartis sur 27 kilomètres de circonférence, est en effet la plus grande application mondiale de la supraconductivité. Il ne pourrait exister sans elle.  Le CERN fête donc la découverte de la supraconductivité avec une conférence exceptionnelle donnée par Philippe Lebrun. Au cours de cette conférence, l’expérience historique de Kammerlingh Onnes sera reproduite. Philippe Lebrun racontera l’histoire de cette étonnante découverte, en la replaçant dans le contexte scientifique de l’époque. Il racontera les développements scientifiques et les applications du premier siècle de la supraconductivité. Conférence en français Merci de bien vouloir vous inscrire au : +41 22 767 76 76 ou cern.reception@cern.ch

  9. Understanding and predicting soot generation in turbulent non-premixed jet flames.

    SciTech Connect (OSTI)

    Wang, Hai; Kook, Sanghoon; Doom, Jeffrey; Oefelein, Joseph Charles; Zhang, Jiayao; Shaddix, Christopher R.; Schefer, Robert W.; Pickett, Lyle M.

    2010-10-01

    This report documents the results of a project funded by DoD's Strategic Environmental Research and Development Program (SERDP) on the science behind development of predictive models for soot emission from gas turbine engines. Measurements of soot formation were performed in laminar flat premixed flames and turbulent non-premixed jet flames at 1 atm pressure and in turbulent liquid spray flames under representative conditions for takeoff in a gas turbine engine. The laminar flames and open jet flames used both ethylene and a prevaporized JP-8 surrogate fuel composed of n-dodecane and m-xylene. The pressurized turbulent jet flame measurements used the JP-8 surrogate fuel and compared its combustion and sooting characteristics to a world-average JP-8 fuel sample. The pressurized jet flame measurements demonstrated that the surrogate was representative of JP-8, with a somewhat higher tendency to soot formation. The premixed flame measurements revealed that flame temperature has a strong impact on the rate of soot nucleation and particle coagulation, but little sensitivity in the overall trends was found with different fuels. An extensive array of non-intrusive optical and laser-based measurements was performed in turbulent non-premixed jet flames established on specially designed piloted burners. Soot concentration data was collected throughout the flames, together with instantaneous images showing the relationship between soot and the OH radical and soot and PAH. A detailed chemical kinetic mechanism for ethylene combustion, including fuel-rich chemistry and benzene formation steps, was compiled, validated, and reduced. The reduced ethylene mechanism was incorporated into a high-fidelity LES code, together with a moment-based soot model and models for thermal radiation, to evaluate the ability of the chemistry and soot models to predict soot formation in the jet diffusion flame. The LES results highlight the importance of including an optically-thick radiation model

  10. Microphysical structure of simulated marine stratocumulus: Effects of physical and numerical approximations

    SciTech Connect (OSTI)

    Stevens, B.; Cotton, W.R.; Feingold, G.

    1996-04-01

    Over the past decade or so the evolution and equilibria of persistent decks of stratocumulus climatologically clinging to the edge of summertime subtropical highs have been an issue of increased scientific inquiry. The particular interest in the microphysical structure of these clouds stems from a variety of hypotheses which suggest that anthropogenic influences or biogenic feedbacks may alter the structure of these clouds in a climatically significant manner. Most of these hypotheses are quite tentative, based as they are on simple formulations of boundary layer structures and interactions between drops and aerosols. This work is concerned with an assessment of the microphysical structure of marine stratocumulus as simulated by an LES-EM model.

  11. PDSF User Meeting 06-04-13.pptx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    4 , 2 013 Lisa Gerhardt Utilization --- 2 --- Past / Planned Outages * Past - May 2 1 st m aintenance / u pgrade t o n ew k ernel * Planned - None Other Topics from PDSF Staff * Cleaning o ut o ld, n on---func=oning m odule fi les i n S L53 - Tomorrow a ll b ut t hese m odules w ill g o a way ( 62 / 2 01) - If n ew s oAware i s n eeded, p lease s end a n e mail! 3.1.6 c ernlib/2006 g sl/1.14 q t4/4.4.3 AcJveTcl/8.4.13.0 c make/2.8.3 g sl/1.3 s ubversion/1.6.9(default) CGAL/3.6 c

  12. Quantum states of neutrons in the gravitational and centrifugal potentials in a new GRANIT spectrometer

    ScienceCinema (OSTI)

    None

    2011-10-06

    We will discuss the scientific program to be studied in a new gravitational spectrometer GRANIT in a broad context of quantum states (quantum behaviour) of ultracold neutrons (UCN) in gravitational [1] and centrifugal [2] potentials, as well as applications of these phenomena/spectrometer to various domains of physics, ranging from studies of fundamental short-range interactions and symmetries to neutron quantum optics and reflectometry using UCN. All these topics, as well as related instrumental and methodical developments have been discussed during dedicated GRANIT-2010 Workshop [3]. The GRANIT spectrometer has been recently installed at the Institut Laue-Langevin, Grenoble, France [4] and could become operational in near future. 1. V.V. Nesvizhevsky et al (2002), Nature 415, 297. 2. V.V. Nesvizhevsky et al (2010), Nature Physics 6, 114. 3. GRANIT-2010, Les Houches, 14-19 february 2010. 4. M. Kreuz et al (2009), NIM 611, 326.

  13. Club of Rome

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le Club de Rome s'est fait connaître du grand public par la publication du premier ouvrage "Halte à la croissance" qui a fait l'object d'un débat, il y a 2 ans. Le Prof. Tinbergen a commencé par s'adonner à la physique, il est docteur en physique et très tôt il s'est tourné vers les problèmes sociaux économiques. Il est expert auprès des nombreux gouvernements et organisations internationales et il a vu ses travaux couronnés par le prix Nobel en 1969.

  14. Mo#va#on

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    = a n i nherent l imita#ons of both: h ot & c old f usion r eac#ons: Hot (well--- d eformed r adioac1ve ac1nides ( Act.) t argets a re u sed a nd compound n ucleus i s q uite e xcited ) * a8empts o f g oing b eyond the r eac#ons A ct. + 48 Ca b y using h eavier p rojec#les l ike 50 Ti, 54 Cr, 58 Fe, a nd 64 Ni gave n o r esults s o f ar. * all h eavier a c#nides w ith Z>98 l ive t o s hort t hat o ne could p erform t arget w ith them. Cold ( magic n uclei a s t argets a re u sed w ith

  15. Microsoft PowerPoint - lathuile_miniboone

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Results from MiniBooNE: A search for e appearance at m 2 ~ 1 eV 2 Georgia Karagiorgi, MIT Results and Perspectives in Particle Physics Les 23 rd Rencontres de Physique de la Vallée d'Aoste LaThuile, Aosta Valley, Italy March 1-7, 2008 Another Another m m 2 2 ? ? LSND experiment: P( µ e ) = sin 2 (2 ) sin 2 ( ) = 0.245 ± 0.067 ± 0.045 % 1.27 L m 2 E observed excess: 87.9 ± 22.4 ± 6.0 anti-ν e events (3.8σ) 2-neutrino mixing with: * Detected anti- ν e from stopped pion source: ̟ + µ +

  16. A Proposal for a Standard Interface Between Monte Carlo Tools And One-Loop Programs

    SciTech Connect (OSTI)

    Binoth, T.; Boudjema, F.; Dissertori, G.; Lazopoulos, A.; Denner, A.; Dittmaier, S.; Frederix, R.; Greiner, N.; Hoeche, Stefan; Giele, W.; Skands, P.; Winter, J.; Gleisberg, T.; Archibald, J.; Heinrich, G.; Krauss, F.; Maitre, D.; Huber, M.; Huston, J.; Kauer, N.; Maltoni, F.; /Louvain U., CP3 /Milan Bicocca U. /INFN, Turin /Turin U. /Granada U., Theor. Phys. Astrophys. /CERN /NIKHEF, Amsterdam /Heidelberg U. /Oxford U., Theor. Phys.

    2011-11-11

    Many highly developed Monte Carlo tools for the evaluation of cross sections based on tree matrix elements exist and are used by experimental collaborations in high energy physics. As the evaluation of one-loop matrix elements has recently been undergoing enormous progress, the combination of one-loop matrix elements with existing Monte Carlo tools is on the horizon. This would lead to phenomenological predictions at the next-to-leading order level. This note summarises the discussion of the next-to-leading order multi-leg (NLM) working group on this issue which has been taking place during the workshop on Physics at TeV Colliders at Les Houches, France, in June 2009. The result is a proposal for a standard interface between Monte Carlo tools and one-loop matrix element programs.

  17. The QCD/SM working group: A Summary report

    SciTech Connect (OSTI)

    Alekhin, S.; Balazs, C.; Ball, R.; Binoth, T.; Boos, E.; Botje, M.; Cacciari, M.; Catani, S.; Del Duca, V.; Dobbs, M.; Ellis, S.D.; Field, R.; deFlorian, D.; Forte, S.; Gardi, E.; Gehrmann, T.; Gehrmann-De Riddler, A.; Giele, W.; Glover, E.W.N.; Grazzini, M.; Guillet, J.-Ph.; HeinRich, G.; Huston, J.; Hinchliffe, I.; Llyin, V.; Kanzaki, J.; Kato, K.; Kersevan, B.; Kidonakis, N.; Kulesza, A.; Kurihara, Y.; Laenen, E.; Lassila-Perini, K.; Lonnblad, L.; Magnea, L.; Mangano, M.; Mazumudar, K.; Moch, S.; Mrenna, S.; Nadolsky, P.; Nason, P.; Olness, F.; Paige, F.; Puljak, I.; Pumplin, J.; Richter-Was, E.; Salam, G.; Scalise, R.; Seymour, M.; Sjostrand, T.; Sterman, G.; Monnesmann, M.; Tournefier, E.; Vogelsang, W.; Vogt, A.; Vogt, R.; Webber, B.; Yuan, C.-P.; Zeppenfeld, D.

    2002-04-01

    This report documents the results obtained by the Working Group on Quantum Chromodynamics and the Standard Model for the Workshop ''Physics at TeV Colliders,'' Les Houches, France, 26 May - 6 June 2003. After a Monte Guide description, the first contributions report on progress in describing multiple interactions, important for the LHC, and underlying events. An announcement of a Monte Carlo database, under construction, is then followed by a number of contributions improving parton shower descriptions. Subsequently, a large number of contributions address resummations in various forms, after which follow studies of QCD effects in pion pair, top quark pair and photon pair plus jet production. After a study of electroweak corrections to hadronic precision observables, the report ends by presenting recent progress in methods to compute finite order corrections at one-loop with many legs, and at two-loop.

  18. Large-eddy simulation of turbulent circular jet flows

    SciTech Connect (OSTI)

    Jones, S. C.; Sotiropoulos, F.; Sale, M. J.

    2002-07-01

    This report presents a numerical method for carrying out large-eddy simulations (LES) of turbulent free shear flows and an application of a method to simulate the flow generated by a nozzle discharging into a stagnant reservoir. The objective of the study was to elucidate the complex features of the instantaneous flow field to help interpret the results of recent biological experiments in which live fish were exposed to the jet shear zone. The fish-jet experiments were conducted at the Pacific Northwest National Laboratory (PNNL) under the auspices of the U.S. Department of Energy’s Advanced Hydropower Turbine Systems program. The experiments were designed to establish critical thresholds of shear and turbulence-induced loads to guide the development of innovative, fish-friendly hydropower turbine designs.

  19. mira perf boot camp 2015-debugging-v1.0.ppt

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Q Mira P erformance B oot C amp May 2 0, 2 015 Ray L oy Applica;ons P erformance E ngineering ALCF Outline § Interac;ve j obs § Log fi les § Exit s eman;cs § bgq_stack § coreprocessor § Serial d ebugger ( gdb) § Parallel d ebugger ( DDT) 2 Interactive runs for tests § Submit a n i nterac;ve j ob t o t he q ueue, e .g. - qsub - I - t 3 0 - n 5 12 § When j ob " runs", t he r equested n odes a re a llocated t o y ou, and y ou r eceive a ( new) s hell p

  20. Italian Exposition

    ScienceCinema (OSTI)

    None

    2011-04-25

    Le DG parle dans son allocution à l'occasion de l'exposition (suivi d'une visite)de la contribution du Cern à la création d'une espace de la technologie européenne. Il parle de la manière comment organiser des formes fructueuses de coopération et coordination internationales dans ce domaine. "Afin de renforcer encore notre relation avec l'industrie et intensifier le transfert de la technologie nous proposerons au ministre de recherche de poursuivre dans le cadre du programme EUREKA ensemble avec les industries des programmes concrètes." Le ministre italien prend ensuite la parole.

  1. Nick Balthaser! Storage Systems Group

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Storage Systems Group Introduction to Archival Storage at NERSC --- 1 --- February 1 5, 2 013 Agenda * Objec2ves - Describe t he r ole o f a rchival s torage i n a 4 ered s torage s trategy - Log i nto t he N ERSC a rchive - Store a nd r etrieve fi les f rom t he a rchive - Avoid c ommon p roblems * Archive B asics - What i s a n a rchive? - Why s hould I u se o ne? - Features o f t he N ERSC a rchive * Using t he N ERSC A rchive Note: U nix/Linux c ommand---line f amiliarity r equired - How t o

  2. Eaboratorp

    Office of Legacy Management (LM)

    letallurgicaI ' Eaboratorp Herowith I am sonding you u pieca of Tube t' 37 Be-N alloy. ' This tube ' ,;I26 ccst jy the U.-S.- ~ipe-and_~ound~~O!npf~y in the CD' dI"Re of thf3iI' experirantal aevelopment of beryllium tubing and it is of interest for the recscm t11et the 1 1~s been molted and cast five time@. It the pick-up of impurities in tho casting procoaa. The o 6cd stlm~les vril 8s woula like to wld iron. U?. BiliQOIl, ma@lnosium also 8 qualit a- nts htlve been picked cc A. B. ureningor

  3. I

    Office of Legacy Management (LM)

    (gj' z,r' I 3 CEISTRAL F;LES O+ 2g I y * ,;r" x(-J,, r;:, i, :*.s- > _ !, ;I'"( 1' . 5; y 0 $ 3 1 10 tiC0 P .' y lT<c -T;\$ ;,' f J j$ 9 c.j?)> <-.$--,r.:+s ; a 0 :.9fS .Yw (' t i 1 7, T :., r*> ;< ' , J;! P' ,.;,. y--T;' ; j;.z,,:;, I, -5 ' ir' Ab ,I,: ,;.,.&.. .*. -wrv . i -rs-ab"=-- . ' J.' & :,' JZFi> :;<; of% 1 .+ ,, .,i:.s this ~~3s tc ;rovi.tie IieGth ,mZ safety cover age &iX i?Jg 8 .I; 3 5 ,j of -'-?- ic ;: F?qi:>::J.iy; - .,.C +

  4. RACORO continental boundary layer cloud investigations. Part I: Case study development and ensemble large-scale forcings

    SciTech Connect (OSTI)

    Vogelmann, Andrew M.; Fridlind, Ann M.; Toto, Tami; Endo, Satoshi; Lin, Wuyin; Wang, Jian; Feng, Sha; Zhang, Yunyan; Turner, David D.; Liu, Yangang; Li, Zhijin; Xie, Shaocheng; Ackerman, Andrew S.; Zhang, Minghua; Khairoutdinov, Marat

    2015-06-19

    Observation-based modeling case studies of continental boundary layer clouds have been developed to study cloudy boundary layers, aerosol influences upon them, and their representation in cloud- and global-scale models. Three 60-hour case study periods span the temporal evolution of cumulus, stratiform, and drizzling boundary layer cloud systems, representing mixed and transitional states rather than idealized or canonical cases. Based on in-situ measurements from the RACORO field campaign and remote-sensing observations, the cases are designed with a modular configuration to simplify use in large-eddy simulations (LES) and single-column models. Aircraft measurements of aerosol number size distribution are fit to lognormal functions for concise representation in models. Values of the aerosol hygroscopicity parameter, ?, are derived from observations to be ~0.10, which are lower than the 0.3 typical over continents and suggestive of a large aerosol organic fraction. Ensemble large-scale forcing datasets are derived from the ARM variational analysis, ECMWF forecasts, and a multi-scale data assimilation system. The forcings are assessed through comparison of measured bulk atmospheric and cloud properties to those computed in 'trial' large-eddy simulations, where more efficient run times are enabled through modest reductions in grid resolution and domain size compared to the full-sized LES grid. Simulations capture many of the general features observed, but the state-of-the-art forcings were limited at representing details of cloud onset, and tight gradients and high-resolution transients of importance. Methods for improving the initial conditions and forcings are discussed. The cases developed are available to the general modeling community for studying continental boundary clouds.

  5. Final Environmental Impact Statement for the construction and operation of Claiborne Enrichment Center, Homer, Louisiana (Docket No. 70-3-70). Volume 2, Public comments and NRC response

    SciTech Connect (OSTI)

    Zeitoun, A.

    1994-08-01

    The Final Environmental Impact Statement (FEIS) (Volume 1), was prepared by the Nuclear Regulatory Commission (NRC) in accordance with regulation 10 CFR Part 51, which implements the National Environmental Policy Act (NEPA), to assess the potential environmental impacts for licensing the construction and operation of a proposed gaseous centrifuge enrichment facility to be built in Claiborne Parish, Louisiana by Louisiana Energy Services, L.P. (LES). The proposed facility would have a production capacity of about 866 metric tons annually of up to 5 weight percent enriched UF{sub 6}, using a proven centrifuge technology. Included in the assessment are co on, both normal operations and potential accidents (internal and external events), and the eventual decontamination and decommissioning of the site. In order to help assure that releases from the operation of the facility and potential impacts on the public are as low as reasonably achievable, an environmental monitoring program was developed by LES to detect significant changes in the background levels of uranium around the site. Other issues addressed include the purpose and need for the facility, the alternatives to the proposed action, potential disposition of the tails, the site selection process, and environmental justice. The NRC staff concludes that the facility can be constructed and operated with small and acceptable impacts on the public and the environment, and proposes to issue a license to the applicant, Louisiana Energy Services, to authorize construction and operation of the proposed facility. The letters in this Appendix have been divided into three sections. Section One contains letters to which the NRC responded by addressing specific comments. Section Two contains the letters that concerned the communities of Forest Grove and Center Springs. Section Three is composed of letters that required no response. These letters were generally in support of the facility.

  6. RACORO continental boundary layer cloud investigations. Part I: Case study development and ensemble large-scale forcings

    SciTech Connect (OSTI)

    Vogelmann, Andrew M.; Fridlind, Ann M.; Toto, Tami; Endo, Satoshi; Lin, Wuyin; Wang, Jian; Feng, Sha; Zhang, Yunyan; Turner, David D.; Liu, Yangang; Li, Zhijin; Xie, Shaocheng; Ackerman, Andrew S.; Zhang, Minghua; Khairoutdinov, Marat

    2015-06-19

    Observation-based modeling case studies of continental boundary layer clouds have been developed to study cloudy boundary layers, aerosol influences upon them, and their representation in cloud- and global-scale models. Three 60-hour case study periods span the temporal evolution of cumulus, stratiform, and drizzling boundary layer cloud systems, representing mixed and transitional states rather than idealized or canonical cases. Based on in-situ measurements from the RACORO field campaign and remote-sensing observations, the cases are designed with a modular configuration to simplify use in large-eddy simulations (LES) and single-column models. Aircraft measurements of aerosol number size distribution are fit to lognormal functions for concise representation in models. Values of the aerosol hygroscopicity parameter, κ, are derived from observations to be ~0.10, which are lower than the 0.3 typical over continents and suggestive of a large aerosol organic fraction. Ensemble large-scale forcing datasets are derived from the ARM variational analysis, ECMWF forecasts, and a multi-scale data assimilation system. The forcings are assessed through comparison of measured bulk atmospheric and cloud properties to those computed in 'trial' large-eddy simulations, where more efficient run times are enabled through modest reductions in grid resolution and domain size compared to the full-sized LES grid. Simulations capture many of the general features observed, but the state-of-the-art forcings were limited at representing details of cloud onset, and tight gradients and high-resolution transients of importance. Methods for improving the initial conditions and forcings are discussed. The cases developed are available to the general modeling community for studying continental boundary clouds.

  7. THE HIGGS WORKING GROUP: SUMMARY REPORT.

    SciTech Connect (OSTI)

    DAWSON, S.; ET AL.

    2005-08-01

    This working group has investigated Higgs boson searches at the Tevatron and the LHC. Once Higgs bosons are found their properties have to be determined. The prospects of Higgs coupling measurements at the LHC and a high-energy linear e{sup +}e{sup -} collider are discussed in detail within the Standard Model and its minimal supersymmetric extension (MSSM). Recent improvements in the theoretical knowledge of the signal and background processes are presented and taken into account. The residual uncertainties are analyzed in detail. Theoretical progress is discussed in particular for the gluon-fusion processes gg {yields} H(+j), Higgs-bremsstrahlung off bottom quarks and the weak vector-boson-fusion (VBF) processes. Following the list of open questions of the last Les Houches workshop in 2001 several background processes have been calculated at next-to-leading order, resulting in a significant reduction of the theoretical uncertainties. Further improvements have been achieved for the Higgs sectors of the MSSM and NMSSM. This report summarizes our work performed before and after the workshop in Les Houches. Part A describes the theoretical developments for signal and background processes. Part B presents recent progress in Higgs boson searches at the Tevatron collider. Part C addresses the determination of Higgs boson couplings, part D the measurement of tan {beta} and part E Higgs boson searches in the VBF processes at the LHC. Part F summarizes Higgs searches in supersymmetric Higgs decays, part G photonic Higgs decays in Higgs-strahlung processes at the LHC, while part H concentrates on MSSM Higgs bosons in the intense-coupling regime at the LHC. Part I presents progress in charged Higgs studies and part J the Higgs discovery potential in the NMSSM at the LHC. The last part K describes Higgs coupling measurements at a 1 TeV linear e{sup +}e{sup -} collider.

  8. A GRAND DESIGN FOR GALAXY CLUSTERS: CONNECTIONS AND PREDICTIONS

    SciTech Connect (OSTI)

    Cavaliere, A.; Lapi, A.; Fusco-Femiano, R.

    2011-11-20

    We analyze with our entropy-based Supermodel a library of 12 galaxy clusters featuring extended X-ray observations of their intracluster plasma (ICP). The few intrinsic parameters of the model-basically, the central level and the outer slope of the entropy profile-enable us to uniformly derive not only robust snapshots of the ICP thermal state, but also the 'concentration' parameter marking the age of the host dark matter (DM) halo. We test these profiles for consistency with numerical simulations and observations. We find the central and the outer entropy correlate, so that these clusters split into two main classes defined on the basis of low (LE) or high entropy (HE) conditions prevailing throughout the ICP. We also find inverse correlations between the central/outer entropy and the halo concentration. We interpret these in terms of mapping the ICP progress on timescales around 5 Gyr toward higher concentrations, under the drive of the DM halo development. The progress proceeds from HE clusters to LE clusters, toward states of deeper entropy erosion by radiative cooling in the inner regions and of decreasing outer entropy production as the accretion peters out. We propose these radial and time features constitute a cluster Grand Design that we use here to derive a number of predictions. For HE clusters we predict sustained outer temperature profiles. For LEs we expect the outer entropy ramp to bend over; hence the temperature declines before steepening at low z; this feature goes together with an increasing turbulent support, a condition that can be directly probed with the Sunyaev-Zel'dovich effect. We finally discuss the looming out of two intermediate subsets: a wiggled HE-tilde at low z that features central temperature profiles retaining imprints of entropy discharged by active galactic nuclei or deep mergers and high-z LEs where the cosmogony/cosmology had little time to enforce a sharp outer entropy bending.

  9. Parameterizing correlations between hydrometeor species in mixed-phase Arctic clouds

    SciTech Connect (OSTI)

    Larson, Vincent E.; Nielsen, Brandon J.; Fan, Jiwen; Ovchinnikov, Mikhail

    2011-08-16

    Mixed-phase Arctic clouds, like other clouds, contain small-scale variability in hydrometeor fields, such as cloud water or snow mixing ratio. This variability may be worth parameterizing in coarse-resolution numerical models. In particular, for modeling processes such as accretion and aggregation, it would be useful to parameterize subgrid correlations among hydrometeor species. However, one difficulty is that there exist many hydrometeor species and many microphysical processes, leading to complexity and computational expense.Existing lower and upper bounds (inequalities) on linear correlation coefficients provide useful guidance, but these bounds are too loose to serve directly as a method to predict subgrid correlations. Therefore, this paper proposes an alternative method that is based on a blend of theory and empiricism. The method begins with the spherical parameterization framework of Pinheiro and Bates (1996), which expresses the correlation matrix in terms of its Cholesky factorization. The values of the elements of the Cholesky matrix are parameterized here using a cosine row-wise formula that is inspired by the aforementioned bounds on correlations. The method has three advantages: 1) the computational expense is tolerable; 2) the correlations are, by construction, guaranteed to be consistent with each other; and 3) the methodology is fairly general and hence may be applicable to other problems. The method is tested non-interactively using simulations of three Arctic mixed-phase cloud cases from two different field experiments: the Indirect and Semi-Direct Aerosol Campaign (ISDAC) and the Mixed-Phase Arctic Cloud Experiment (M-PACE). Benchmark simulations are performed using a large-eddy simulation (LES) model that includes a bin microphysical scheme. The correlations estimated by the new method satisfactorily approximate the correlations produced by the LES.

  10. RACORO continental boundary layer cloud investigations. Part I: Case study development and ensemble large-scale forcings

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Vogelmann, Andrew M.; Fridlind, Ann M.; Toto, Tami; Endo, Satoshi; Lin, Wuyin; Wang, Jian; Feng, Sha; Zhang, Yunyan; Turner, David D.; Liu, Yangang; et al

    2015-06-19

    Observation-based modeling case studies of continental boundary layer clouds have been developed to study cloudy boundary layers, aerosol influences upon them, and their representation in cloud- and global-scale models. Three 60-hour case study periods span the temporal evolution of cumulus, stratiform, and drizzling boundary layer cloud systems, representing mixed and transitional states rather than idealized or canonical cases. Based on in-situ measurements from the RACORO field campaign and remote-sensing observations, the cases are designed with a modular configuration to simplify use in large-eddy simulations (LES) and single-column models. Aircraft measurements of aerosol number size distribution are fit to lognormal functionsmore » for concise representation in models. Values of the aerosol hygroscopicity parameter, κ, are derived from observations to be ~0.10, which are lower than the 0.3 typical over continents and suggestive of a large aerosol organic fraction. Ensemble large-scale forcing datasets are derived from the ARM variational analysis, ECMWF forecasts, and a multi-scale data assimilation system. The forcings are assessed through comparison of measured bulk atmospheric and cloud properties to those computed in 'trial' large-eddy simulations, where more efficient run times are enabled through modest reductions in grid resolution and domain size compared to the full-sized LES grid. Simulations capture many of the general features observed, but the state-of-the-art forcings were limited at representing details of cloud onset, and tight gradients and high-resolution transients of importance. Methods for improving the initial conditions and forcings are discussed. The cases developed are available to the general modeling community for studying continental boundary clouds.« less

  11. Limitations of one-dimensional mesoscale PBL parameterizations in reproducing mountain-wave flows

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Munoz-Esparza, Domingo; Sauer, Jeremy A.; Linn, Rodman R.; Kosovic, Branko

    2015-12-08

    In this study, mesoscale models are considered to be the state of the art in modeling mountain-wave flows. Herein, we investigate the role and accuracy of planetary boundary layer (PBL) parameterizations in handling the interaction between large-scale mountain waves and the atmospheric boundary layer. To that end, we use recent large-eddy simulation (LES) results of mountain waves over a symmetric two-dimensional bell-shaped hill [Sauer et al., J. Atmos. Sci. (2015)], and compare them to four commonly used PBL schemes. We find that one-dimensional PBL parameterizations produce reasonable agreement with the LES results in terms of vertical wavelength, amplitude of velocitymore » and turbulent kinetic energy distribution in the downhill shooting flow region. However, the assumption of horizontal homogeneity in PBL parameterizations does not hold in the context of these complex flow configurations. This inappropriate modeling assumption results in a vertical wavelength shift producing errors of ≈ 10 m s–1 at downstream locations due to the presence of a coherent trapped lee wave that does not mix with the atmospheric boundary layer. In contrast, horizontally-integrated momentum flux derived from these PBL schemes displays a realistic pattern. Therefore results from mesoscale models using ensembles of one-dimensional PBL schemes can still potentially be used to parameterize drag effects in general circulation models. Nonetheless, three-dimensional PBL schemes must be developed in order for mesoscale models to accurately represent complex-terrain and other types of flows where one-dimensional PBL assumptions are violated.« less

  12. Limitations of one-dimensional mesoscale PBL parameterizations in reproducing mountain-wave flows

    SciTech Connect (OSTI)

    Munoz-Esparza, Domingo; Sauer, Jeremy A.; Linn, Rodman R.; Kosovic, Branko

    2015-12-08

    In this study, mesoscale models are considered to be the state of the art in modeling mountain-wave flows. Herein, we investigate the role and accuracy of planetary boundary layer (PBL) parameterizations in handling the interaction between large-scale mountain waves and the atmospheric boundary layer. To that end, we use recent large-eddy simulation (LES) results of mountain waves over a symmetric two-dimensional bell-shaped hill [Sauer et al., J. Atmos. Sci. (2015)], and compare them to four commonly used PBL schemes. We find that one-dimensional PBL parameterizations produce reasonable agreement with the LES results in terms of vertical wavelength, amplitude of velocity and turbulent kinetic energy distribution in the downhill shooting flow region. However, the assumption of horizontal homogeneity in PBL parameterizations does not hold in the context of these complex flow configurations. This inappropriate modeling assumption results in a vertical wavelength shift producing errors of ≈ 10 m s–1 at downstream locations due to the presence of a coherent trapped lee wave that does not mix with the atmospheric boundary layer. In contrast, horizontally-integrated momentum flux derived from these PBL schemes displays a realistic pattern. Therefore results from mesoscale models using ensembles of one-dimensional PBL schemes can still potentially be used to parameterize drag effects in general circulation models. Nonetheless, three-dimensional PBL schemes must be developed in order for mesoscale models to accurately represent complex-terrain and other types of flows where one-dimensional PBL assumptions are violated.

  13. A stochastic extension of the explicit algebraic subgrid-scale models

    SciTech Connect (OSTI)

    Rasam, A. Brethouwer, G.; Johansson, A. V.

    2014-05-15

    The explicit algebraic subgrid-scale (SGS) stress model (EASM) of Marstorp et al. [“Explicit algebraic subgrid stress models with application to rotating channel flow,” J. Fluid Mech. 639, 403–432 (2009)] and explicit algebraic SGS scalar flux model (EASFM) of Rasam et al. [“An explicit algebraic model for the subgrid-scale passive scalar flux,” J. Fluid Mech. 721, 541–577 (2013)] are extended with stochastic terms based on the Langevin equation formalism for the subgrid-scales by Marstorp et al. [“A stochastic subgrid model with application to turbulent flow and scalar mixing,” Phys. Fluids 19, 035107 (2007)]. The EASM and EASFM are nonlinear mixed and tensor eddy-diffusivity models, which improve large eddy simulation (LES) predictions of the mean flow, Reynolds stresses, and scalar fluxes of wall-bounded flows compared to isotropic eddy-viscosity and eddy-diffusivity SGS models, especially at coarse resolutions. The purpose of the stochastic extension of the explicit algebraic SGS models is to further improve the characteristics of the kinetic energy and scalar variance SGS dissipation, which are key quantities that govern the small-scale mixing and dispersion dynamics. LES of turbulent channel flow with passive scalar transport shows that the stochastic terms enhance SGS dissipation statistics such as length scale, variance, and probability density functions and introduce a significant amount of backscatter of energy from the subgrid to the resolved scales without causing numerical stability problems. The improvements in the SGS dissipation predictions in turn enhances the predicted resolved statistics such as the mean scalar, scalar fluxes, Reynolds stresses, and correlation lengths. Moreover, the nonalignment between the SGS stress and resolved strain-rate tensors predicted by the EASM with stochastic extension is in much closer agreement with direct numerical simulation data.

  14. Simulations of Turbulent Flows with Strong Shocks and Density Variations: Final Report

    SciTech Connect (OSTI)

    Sanjiva Lele

    2012-10-01

    The target of this SciDAC Science Application was to develop a new capability based on high-order and high-resolution schemes to simulate shock-turbulence interactions and multi-material mixing in planar and spherical geometries, and to study Rayleigh-Taylor and Richtmyer-Meshkov turbulent mixing. These fundamental problems have direct application in high-speed engineering flows, such as inertial confinement fusion (ICF) capsule implosions and scramjet combustion, and also in the natural occurrence of supernovae explosions. Another component of this project was the development of subgrid-scale (SGS) models for large-eddy simulations of flows involving shock-turbulence interaction and multi-material mixing, that were to be validated with the DNS databases generated during the program. The numerical codes developed are designed for massively-parallel computer architectures, ensuring good scaling performance. Their algorithms were validated by means of a sequence of benchmark problems. The original multi-stage plan for this five-year project included the following milestones: 1) refinement of numerical algorithms for application to the shock-turbulence interaction problem and multi-material mixing (years 1-2); 2) direct numerical simulations (DNS) of canonical shock-turbulence interaction (years 2-3), targeted at improving our understanding of the physics behind the combined two phenomena and also at guiding the development of SGS models; 3) large-eddy simulations (LES) of shock-turbulence interaction (years 3-5), improving SGS models based on the DNS obtained in the previous phase; 4) DNS of planar/spherical RM multi-material mixing (years 3-5), also with the two-fold objective of gaining insight into the relevant physics of this instability and aiding in devising new modeling strategies for multi-material mixing; 5) LES of planar/spherical RM mixing (years 4-5), integrating the improved SGS and multi-material models developed in stages 3 and 5. This final report is

  15. The QCD/SM Working Group: Summary Report

    SciTech Connect (OSTI)

    M. Dobbs et al.

    2004-08-05

    Among the many physics processes at TeV hadron colliders, we look most eagerly for those that display signs of the Higgs boson or of new physics. We do so however amid an abundance of processes that proceed via Standard Model (SM) and in particular Quantum Chromodynamics (QCD) interactions, and that are interesting in their own right. Good knowledge of these processes is required to help us distinguish the new from the known. Their theoretical and experimental study teaches us at the same time more about QCD/SM dynamics, and thereby enables us to further improve such distinctions. This is important because it is becoming increasingly clear that the success of finding and exploring Higgs boson physics or other New Physics at the Tevatron and LHC will depend significantly on precise understanding of QCD/SM effects for many observables. To improve predictions and deepen the study of QCD/SM signals and backgrounds was therefore the ambition for our QCD/SM working group at this Les Houches workshop. Members of the working group made significant progress towards this on a number of fronts. A variety of tools were further developed, from methods to perform higher order perturbative calculations or various types of resummation, to improvements in the modeling of underlying events and parton showers. Furthermore, various precise studies of important specific processes were conducted. A significant part of the activities in Les Houches revolved around Monte Carlo simulation of collision events. A number of contributions in this report reflect the progress made in this area. At present a large number of Monte Carlo programs exist, each written with a different purpose and employing different techniques. Discussions in Les Houches revealed the need for an accessible primer on Monte Carlo programs, featuring a listing of various codes, each with a short description, but also providing a low-level explanation of the underlying methods. This primer has now been compiled and a

  16. The QCD/SM working group: Summary report

    SciTech Connect (OSTI)

    Dobbs, Matt; Frixione, S.; Laenen, E.; De Roeck, A.; Tollefson, K.; Andersen, J.; Balazs, C.; Banfi, A.; Bernreuther, W.; Binoth, T.; Brandenburg, A.; Buttar, C.; Cao, C-H.; Cruz, A.; Dawson, I.; DelDuca, V.; Drollinger, V.; Dudko, L.; Eynck, T.; Field, R.; Grazzini, M.; Guillet, J.P.; Heinrich, G.; Huston, J.; Kauer, N.; Kidonakis, N.; Kulesza, A.; Lassila-Perini, K.; Magnea, L.; Mahmoudi, F.; Maina, E.; Maltoni, F.; Nolten, M.; Moraes, A.; Moretti, S.; Mrenna, S.; Nagy, Z.; Olness, F.; Puljak, I.; Ross, D.A.; Sabio-Vera, A.; Salam, G.P.; Sherstnev, A.; Si, Z.G.; Sjostrand, T.; Skands, P.; Thome, E.; Trocsanyi, Z.; Uwer, P.; Weinzierl, S.; Yuan, C.P.; Zanderighi,G.; Zanderighi, G.

    2004-04-09

    Among the many physics processes at TeV hadron colliders, we look most eagerly for those that display signs of the Higgs boson or of new physics. We do so however amid an abundance of processes that proceed via Standard Model (SM) and in particular Quantum Chromodynamics (QCD) interactions, and that are interesting in their own right. Good knowledge of these processes is required to help us distinguish the new from the known. Their theoretical and experimental study teaches us at the same time more about QCD/SM dynamics, and thereby enables us to further improve such distinctions. This is important because it is becoming increasingly clear that the success of finding and exploring Higgs boson physics or other New Physics at the Tevatron and LHC will depend significantly on precise understanding of QCD/SM effects for many observables. To improve predictions and deepen the study of QCD/SM signals and backgrounds was therefore the ambition for our QCD/SM working group at this Les Houches workshop. Members of the working group made significant progress towards this on a number of fronts. A variety of tools were further developed, from methods to perform higher order perturbative calculations or various types of resummation, to improvements in the modeling of underlying events and parton showers. Furthermore, various precise studies of important specific processes were conducted. A significant part of the activities in Les Houches revolved around Monte Carlo simulation of collision events. A number of contributions in this report reflect the progress made in this area. At present a large number of Monte Carlo programs exist, each written with a different purpose and employing different techniques. Discussions in Les Houches revealed the need for an accessible primer on Monte Carlo programs, featuring a listing of various codes, each with a short description, but also providing a low-level explanation of the underlying methods. This primer has now been compiled and a

  17. Dispersion of Radionuclides and Exposure Assessment in Urban Environments: A Joint CEA and LLNL Report

    SciTech Connect (OSTI)

    Glascoe, Lee; Gowardhan, Akshay; Lennox, Kristin; Simpson, Matthew; Yu, Kristen; Armand, Patrick; Duchenne, Christophe; Mariotte, Frederic; Pectorin, Xavier

    2014-12-19

    In the interest of promoting the international exchange of technical expertise, the US Department of Energy’s Office of Emergency Operations (NA-40) and the French Commissariat à l'Energie Atomique et aux énergies alternatives (CEA) requested that the National Atmospheric Release Advisory Center (NARAC) of Lawrence Livermore National Laboratory (LLNL) in Livermore, California host a joint table top exercise with experts in emergency management and atmospheric transport modeling. In this table top exercise, LLNL and CEA compared each other’s flow and dispersion models. The goal of the comparison is to facilitate the exchange of knowledge, capabilities, and practices, and to demonstrate the utility of modeling dispersal at different levels of computational fidelity. Two modeling approaches were examined, a regional scale modeling approach, appropriate for simple terrain and/or very large releases, and an urban scale modeling approach, appropriate for small releases in a city environment. This report is a summary of LLNL and CEA modeling efforts from this exercise. Two different types of LLNL and CEA models were employed in the analysis: urban-scale models (Aeolus CFD at LLNL/NARAC and Parallel- Micro-SWIFT-SPRAY, PMSS, at CEA) for analysis of a 5,000 Ci radiological release and Lagrangian Particle Dispersion Models (LODI at LLNL/NARAC and PSPRAY at CEA) for analysis of a much larger (500,000 Ci) regional radiological release. Two densely-populated urban locations were chosen: Chicago with its high-rise skyline and gridded street network and Paris with its more consistent, lower building height and complex unaligned street network. Each location was considered under early summer daytime and nighttime conditions. Different levels of fidelity were chosen for each scale: (1) lower fidelity mass-consistent diagnostic, intermediate fidelity Navier-Stokes RANS models, and higher fidelity Navier-Stokes LES for urban-scale analysis, and (2) lower-fidelity single

  18. World enrichment services market 1990-2005

    SciTech Connect (OSTI)

    1990-08-01

    Growth in world enrichment capacity, already in oversupply, will lead to a very competitive enrichment services market by the second half of the 1990s. Three of the four primary enrichment suppliers (USDOE, Eurodif, and Urenco) already have the capacity to produce 33 million SWU per year. Explorts from the Soviet Union and the People`s Republic of China (PRC) currently make available an additional six million SWU per year, and that figure could rise substantially. With additional supply capability expected from China, the Soviet Union, Louisiana Energy Services (LES) and Isotope Technologies (ITI), and the increased capacity of Urenco, and possibly even AVLIS from DOE, enrichment supply capability could exceed 46 million SWU per year by the year 2000. Yet annual enrichment requirements are only estimated to grow from 23.5 million SWU in 1990, to 28.9 million SWU by 2000. Total unfilled enrichment requirements will rise significantly in the second half of the 1990s, particularly from US utilities, creating sales opportunities for which suppliers will compete aggressively. These factors foretell a very competitive market in which sellers will offer low prices and flexible contracts. The anticipation of such strong competition also raises the question of which enrichment technology will succeed, and puts tremendous pressure on all suppliers to find cost-effective means of production as quickly as possible.

  19. Review of Wind Energy Forecasting Methods for Modeling Ramping Events

    SciTech Connect (OSTI)

    Wharton, S; Lundquist, J K; Marjanovic, N; Williams, J L; Rhodes, M; Chow, T K; Maxwell, R

    2011-03-28

    Tall onshore wind turbines, with hub heights between 80 m and 100 m, can extract large amounts of energy from the atmosphere since they generally encounter higher wind speeds, but they face challenges given the complexity of boundary layer flows. This complexity of the lowest layers of the atmosphere, where wind turbines reside, has made conventional modeling efforts less than ideal. To meet the nation's goal of increasing wind power into the U.S. electrical grid, the accuracy of wind power forecasts must be improved. In this report, the Lawrence Livermore National Laboratory, in collaboration with the University of Colorado at Boulder, University of California at Berkeley, and Colorado School of Mines, evaluates innovative approaches to forecasting sudden changes in wind speed or 'ramping events' at an onshore, multimegawatt wind farm. The forecast simulations are compared to observations of wind speed and direction from tall meteorological towers and a remote-sensing Sound Detection and Ranging (SODAR) instrument. Ramping events, i.e., sudden increases or decreases in wind speed and hence, power generated by a turbine, are especially problematic for wind farm operators. Sudden changes in wind speed or direction can lead to large power generation differences across a wind farm and are very difficult to predict with current forecasting tools. Here, we quantify the ability of three models, mesoscale WRF, WRF-LES, and PF.WRF, which vary in sophistication and required user expertise, to predict three ramping events at a North American wind farm.

  20. Dry-vault storage of spent fuel at the CASCAD facility

    SciTech Connect (OSTI)

    Baillif, L.; Guay, M.

    1989-01-01

    A new modular dry storage vault concept using vertical metallic wells cooled by natural convection has been developed by the Commissariat a l'Energie Atomique and Societe Generale pour les Techniques Nouvelles to accommodate special fuels for high-level wastes. Basic specifications and design criteria have been followed to guarantee a double containment system and cooling to maintain the fuel below an acceptable temperature. The double containment is provided by two static barriers: At the reactor, fuels are placed in containers playing the role of the first barrier; the storage wells constitute the second barrier. Spent fuel placed in wells is cooled by natural convection: a boundary layer is created along the outer side of the well. The heated air rises along the well leading to a thermosiphon flow that extracts the heat released. For heat transfer, studies, computations, and experimental tests have been carried out to calculate and determine the temperature of the containers and the fuel rod temperatures in various situations. The CASCAD vault storage can be applied to light water reactor (LWR) fuels without any difficulties if two requirements are satisfied: (1) Spend fuels have to be inserted in tight canisters. (2) Spent fuels have to be received only after a minimum decay time of 5 yr.

  1. The selection of turbulence models for prediction of room airflow

    SciTech Connect (OSTI)

    Nielsen, P.V.

    1998-10-01

    The airflow in buildings involves a combination of many different flow elements. It is, therefore, difficult to find an adequate, all-round turbulence model covering all aspects. Consequently, it is appropriate and economical to choose turbulence models according to the situation that is to be predicted. This paper discusses the use of different turbulence models and their advantages in given situations. As an example, it is shown that a simple zero-equation model can be used for the prediction of special situations as flow with a low level of turbulence. A zero-equation model with compensation for room dimensions and velocity level also is discussed. A {kappa}-{epsilon} model expanded by damping functions is used to improve the prediction of the flow in a room ventilated by displacement ventilation. The damping functions especially take into account the turbulence level and the vertical temperature gradient. Low Reynolds number models (LNR models) are used to improve the prediction of evaporation-controlled emissions from building material, which is shown by an example. Finally, large eddy simulation (LES) of room airflow is discussed and demonstrated.

  2. Safety Evaluation Report for the Claiborne Enrichment Center, Homer, Louisiana (Docket No. 70-3070)

    SciTech Connect (OSTI)

    Not Available

    1994-01-01

    This report documents the US Nuclear Regulatory Commission (NRC) staff review and safety evaluation of the Louisiana Energy Services, L.P. (LES, the applicant) application for a license to possess and use byproduct, source, and special nuclear material and to enrich natural uranium to a maximum of 5 percent U-235 by the gas centrifuge process. The plant, to be known as the Claiborne Enrichment Center (CEC), would be constructed near the town of Homer in Claiborne Parish, Louisiana. At full production in a given year, the plant will receive approximately 4,700 tonnes of feed UF{sub 6} and produce 870 tonnes of low-enriched UF{sub 6}, and 3,830 tonnes of depleted UF{sub 6} tails. Facility construction, operation, and decommissioning are expected to last 5, 30, and 7 years, respectively. The objective of the review is to evaluate the potential adverse impacts of operation of the facility on worker and public health and safety under both normal operating and accident conditions. The review also considers the management organization, administrative programs, and financial qualifications provided to assure safe design and operation of the facility. The NRC staff concludes that the applicant`s descriptions, specifications, and analyses provide an adequate basis for safety review of facility operations and that construction and operation of the facility does not pose an undue risk to public health and safety.

  3. Development and testing of an aerosol-stratus cloud parameterization scheme for middle and high latitudes

    SciTech Connect (OSTI)

    Olsson, P.Q.; Meyers, M.P.; Kreidenweis, S.; Cotton, W.R.

    1996-04-01

    The aim of this new project is to develop an aerosol/cloud microphysics parameterization of mixed-phase stratus and boundary layer clouds. Our approach is to create, test, and implement a bulk-microphysics/aerosol model using data from Atmospheric Radiation Measurement (ARM) Cloud and Radiation Testbed (CART) sites and large-eddy simulation (LES) explicit bin-resolving aerosol/microphysics models. The primary objectives of this work are twofold. First, we need the prediction of number concentrations of activated aerosol which are transferred to the droplet spectrum, so that the aerosol population directly affects the cloud formation and microphysics. Second, we plan to couple the aerosol model to the gas and aqueous-chemistry module that will drive the aerosol formation and growth. We begin by exploring the feasibility of performing cloud-resolving simulations of Arctic stratus clouds over the North Slope CART site. These simulations using Colorado State University`s regional atmospheric modeling system (RAMS) will be useful in designing the structure of the cloud-resolving model and in interpreting data acquired at the North Slope site.

  4. Final Environmental Impact Statement for the construction and operation of Claiborne Enrichment Center, Homer, Louisiana (Docket No. 70-3070)

    SciTech Connect (OSTI)

    Zeitoun, A.

    1994-08-01

    This two-volume Final Environmental Impact Statement (FEIS) was prepared by the Nuclear Regulatory Commission (NRC) in accordance with regulation 10 CFR Part 51, which implements the National Environmental Policy Act (NEPA). Volume 1 contains the assessment of the potential environmental impacts for licensing the construction and operation of a proposed gaseous centrifuge enrichment facility to be built in Claiborne Parish, Louisiana, by Louisiana Energy Services, LP. (LES). The proposed facility would have a production capacity of about 866 metric tons annually of up to 5 weight percent enriched UF{sub 6}, using a proven centrifuge technology. Included in the assessment are construction, both normal operations and potential accidents (internal and external events), and the eventual decontamination and decommissioning (D&D)- of the site. Issues addressed include the purpose and need for the facility, the alternatives to the proposed action, potential disposition of the tails, the site selection process, and environmental justice. The NRC staff concludes that the facility can be constructed and operated with small and acceptable impacts on the public and the environment. The FEIS supports issuance of a license to the applicant, Louisiana Energy Services, to authorize construction and operation of the proposed facility.

  5. A Multi-Year Plan for Enhancing Turbulence Modeling in Hydra-TH Revised and Updated Version 2.0

    SciTech Connect (OSTI)

    Smith, Thomas M.; Berndt, Markus; Baglietto, Emilio; Magolan, Ben

    2015-10-01

    The purpose of this report is to document a multi-year plan for enhancing turbulence modeling in Hydra-TH for the Consortium for Advanced Simulation of Light Water Reactors (CASL) program. Hydra-TH is being developed to the meet the high- fidelity, high-Reynolds number CFD based thermal hydraulic simulation needs of the program. This work is being conducted within the thermal hydraulics methods (THM) focus area. This report is an extension of THM CASL milestone L3:THM.CFD.P10.02 [33] (March, 2015) and picks up where it left off. It will also serve to meet the requirements of CASL THM level three milestone, L3:THM.CFD.P11.04, scheduled for completion September 30, 2015. The objectives of this plan will be met by: maturation of recently added turbulence models, strategic design/development of new models and systematic and rigorous testing of existing and new models and model extensions. While multi-phase turbulent flow simulations are important to the program, only single-phase modeling will be considered in this report. Large Eddy Simulation (LES) is also an important modeling methodology. However, at least in the first year, the focus is on steady-state Reynolds Averaged Navier-Stokes (RANS) turbulence modeling.

  6. A new subgrid-scale representation of hydrometeor fields using a multivariate PDF

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Griffin, Brian M.; Larson, Vincent E.

    2016-06-03

    The subgrid-scale representation of hydrometeor fields is important for calculating microphysical process rates. In order to represent subgrid-scale variability, the Cloud Layers Unified By Binormals (CLUBB) parameterization uses a multivariate probability density function (PDF). In addition to vertical velocity, temperature, and moisture fields, the PDF includes hydrometeor fields. Previously, hydrometeor fields were assumed to follow a multivariate single lognormal distribution. Now, in order to better represent the distribution of hydrometeors, two new multivariate PDFs are formulated and introduced.The new PDFs represent hydrometeors using either a delta-lognormal or a delta-double-lognormal shape. The two new PDF distributions, plus the previous single lognormalmore » shape, are compared to histograms of data taken from large-eddy simulations (LESs) of a precipitating cumulus case, a drizzling stratocumulus case, and a deep convective case. Finally, the warm microphysical process rates produced by the different hydrometeor PDFs are compared to the same process rates produced by the LES.« less

  7. Assessment of a hybrid finite element and finite volume code for turbulent incompressible flows

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Xia, Yidong; Wang, Chuanjin; Luo, Hong; Christon, Mark; Bakosi, Jozsef

    2015-12-15

    Hydra-TH is a hybrid finite-element/finite-volume incompressible/low-Mach flow simulation code based on the Hydra multiphysics toolkit being developed and used for thermal-hydraulics applications. In the present work, a suite of verification and validation (V&V) test problems for Hydra-TH was defined to meet the design requirements of the Consortium for Advanced Simulation of Light Water Reactors (CASL). The intent for this test problem suite is to provide baseline comparison data that demonstrates the performance of the Hydra-TH solution methods. The simulation problems vary in complexity from laminar to turbulent flows. A set of RANS and LES turbulence models were used in themore » simulation of four classical test problems. Numerical results obtained by Hydra-TH agreed well with either the available analytical solution or experimental data, indicating the verified and validated implementation of these turbulence models in Hydra-TH. Where possible, we have attempted some form of solution verification to identify sensitivities in the solution methods, and to suggest best practices when using the Hydra-TH code.« less

  8. Improved mixed oxide fuel calculations with the evaluated nuclear data library JEFF-3.2

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Noguere, G.; Bernard, D.; Blaise, P.; Bouland, O.; Leal, Luiz C.; Leconte, P.; Litaize, O.; Peneliau, Y.; Roque, B.; Santamarina, A.; et al

    2016-02-01

    In this study, an overestimation of the keff values for mixed oxide (MOX) fuels was identified with Monte Carlo (TRIPOLI-4) and deterministic (APOLLO2) calculations based on the Joint Evaluated Fission and Fusion (JEFF) evaluated nuclear data library. The overestimation becomes sizeable with Pit aging, reaching a reactivity change of Delta(p)similar or equal to+700 pcm for integral measurements carried out with MOX fuel containing a large amount of americium. This bias was observed for various critical configurations performed in the zero power reactor EOLE of the Commissariat a l'energie atomique et aux energies alternatives (CEA), Cadarache, France. The present work focusesmore » on the improvements achieved with the new 239PU and 241Am evaluated nuclear data files available in the latest version of the JEFF library (JEFF-3.2). The resolved resonance range of the plutonium evaluation was reevaluated at Oak Ridge National Laboratory (ORNL), Oak Ridge, Tennessee, with the Ski/NH code in collaboration with CEA Cadarache. The resonance parameters of the americium evaluation were obtained with the REFIT code in collaboration with the research institutes Institute for Reference Materials and Measurements aRmm, Geel, Belgium, and Institut de recherche sur les lois fondamentales de l'Univers ofio, Saclay, France.« less

  9. GPHS-RTGs in support of the Cassini RTG Program. Final technical report, January 11, 1991--April 30, 1998

    SciTech Connect (OSTI)

    1998-08-01

    As noted in the historical summary, this program encountered a number of changes in direction, schedule, and scope over the period 11 January 1991 to 31 December 1998. The report provides a comprehensive summary of all the varied aspects of the program over its seven and a quarter years, and highlights those aspects that provide information beneficial to future radioisotope programs. In addition to summarizing the scope of the Cassini GPHS-RTG Program provided as background, the introduction includes a discussion of the scope of the final report and offers reference sources for information on those topics not covered. Much of the design heritage of the GPHS-RTG comes from the Multi-Hundred Watt (MHW) RTGs used on the Lincoln Experimental Satellites (LES) 8/9 and Voyager spacecraft. The design utilized for the Cassini program was developed, in large part, under the GPHS-RTG program which produced the Galileo and Ulysses RTGs. Reports from those programs included detailed documentation of the design, development, and testing of converter components and full converters that were identical to, or similar to, components used in the Cassini program. Where such information is available in previous reports, it is not repeated here.

  10. Role of Design Standards in Wind Plant Optimization (Presentation)

    SciTech Connect (OSTI)

    Veers, P.; Churchfield, M.; Lee, S.; Moon, J.; Larsen, G.

    2013-10-01

    When a turbine is optimized, it is done within the design constraints established by the objective criteria in the international design standards used to certify a design. Since these criteria are multifaceted, it is a challenging task to conduct the optimization, but it can be done. The optimization is facilitated by the fact that a standard turbine model is subjected to standard inflow conditions that are well characterized in the standard. Examples of applying these conditions to rotor optimization are examined. In other cases, an innovation may provide substantial improvement in one area, but be challenged to impact all of the myriad design load cases. When a turbine is placed in a wind plant, the challenge is magnified. Typical design practice optimizes the turbine for stand-alone operation, and then runs a check on the actual site conditions, including wakes from all nearby turbines. Thus, each turbine in a plant has unique inflow conditions. The possibility of creating objective and consistent inflow conditions for turbines within a plant, for used in optimization of the turbine and the plant, are examined with examples taken from LES simulation.

  11. A Reconstructed Discontinuous Galerkin Method for the Compressible Navier-Stokes Equations on Hybrid Grids

    SciTech Connect (OSTI)

    Xiaodong Liu; Lijun Xuan; Hong Luo; Yidong Xia

    2001-01-01

    A reconstructed discontinuous Galerkin (rDG(P1P2)) method, originally introduced for the compressible Euler equations, is developed for the solution of the compressible Navier- Stokes equations on 3D hybrid grids. In this method, a piecewise quadratic polynomial solution is obtained from the underlying piecewise linear DG solution using a hierarchical Weighted Essentially Non-Oscillatory (WENO) reconstruction. The reconstructed quadratic polynomial solution is then used for the computation of the inviscid fluxes and the viscous fluxes using the second formulation of Bassi and Reay (Bassi-Rebay II). The developed rDG(P1P2) method is used to compute a variety of flow problems to assess its accuracy, efficiency, and robustness. The numerical results demonstrate that the rDG(P1P2) method is able to achieve the designed third-order of accuracy at a cost slightly higher than its underlying second-order DG method, outperform the third order DG method in terms of both computing costs and storage requirements, and obtain reliable and accurate solutions to the large eddy simulation (LES) and direct numerical simulation (DNS) of compressible turbulent flows.

  12. Andrei Sakharov

    ScienceCinema (OSTI)

    None

    2011-04-25

    Ce discours donné par Mons.Jonauch qui est né en Tchécoslovaquie et a fait ses études à Leningrad, Moscou et Prague, est organisé par le comité Youri Orlov. Le conférencier parle de Andrei Sakharov, ce physicien et homme soviétique qui fit ses études à Moscou, effectua des recherches sur les armes thermonucléaires et entra à l'Académie des Sciences d'URSS en 1953. Il participa à la mise au point de la bombe à hydrogène, mais s'opposa quelques années plus tard à la poursuite des expériences nucléaires. Il créa en 1970 le comité pour la défense des droits de l'homme ce que lui valut le prix Nobel de la paix en 1975.

  13. Microsoft PowerPoint - HAB 2012 Final.pptx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    fe a n d E ff e c ti v e C le a n u p th a t P ro te c ts th e C o lu m b ia R iv e r Re du ce s th e Ac tiv e Sit e Fo ot pr int of Cl ea nu p to 75 Sq ua re Mi les (5 86 to 75 ) Sig ni fic an tly Re du ce s Lo ng -T erm Mo rtg ag e Co st s At Co m pl eti on , Sh ift s Em ph as is an d Re so ur ce s to Fu ll of th e Ce nt ra l Pla tea u (7 5 sq ua re m ile s) Re du ce s Co st s by "R i Mi ss io Ri ch la nd O pe ra tio ns Of fic e B & C Ar ea Inte rim Saf e Sto rag e f N Ar ea Inte rim

  14. Microsoft PowerPoint - HAB1111-Dowellfinalnobu.pptx

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    fe a n d E ff e c ti v e C le a n u p th a t P ro te c ts th e C o lu m b ia R iv e r ¾ Re du ce s th e Ac tiv e Sit e Fo ot pr int of Cl ea nu p to 75 Sq ua re Mi les (5 86 to 75 ) ¾ Sig ni fic an tly Re du ce s Lo ng -T erm Mo rtg ag e Co st s ¾ At Co m pl eti on , Sh ift s Em ph as is an d Re so ur ce s to Fu ll of th e Ce nt ra l Pla tea u (7 5 sq ua re m ile s) ¾ Re du ce s Co st s by "R i Mi ss io Ri ch la nd O pe ra tio ns Of fic e B & C Ar ea 9 Inte rim Saf e Sto rag e f 9 N

  15. Modifications to WRFs dynamical core to improve the treatment of moisture for large-eddy simulations

    SciTech Connect (OSTI)

    Xiao, Heng; Endo, Satoshi; Wong, May; Skamarock, William C.; Klemp, Joseph B.; Fast, Jerome D.; Gustafson, Jr., William I.; Vogelmann, Andrew; Wang, Hailong; Liu, Yangang; Lin, Wuyin

    2015-10-29

    Yamaguchi and Feingold (2012) note that the cloud fields in their large-eddy simulations (LESs) of marine stratocumulus using the Weather Research and Forecasting (WRF) model exhibit a strong sensitivity to time stepping choices. In this study, we reproduce and analyze this sensitivity issue using two stratocumulus cases, one marine and one continental. Results show that (1) the sensitivity is associated with spurious motions near the moisture jump between the boundary layer and the free atmosphere, and (2) these spurious motions appear to arise from neglecting small variations in water vapor mixing ratio (qv) in the pressure gradient calculation in the acoustic sub-stepping portion of the integration procedure. We show that this issue is remedied in the WRF dynamical core by replacing the prognostic equation for the potential temperature θ with one for the moist potential temperature θm=θ(1+1.61qv), which allows consistent treatment of moisture in the calculation of pressure during the acoustic sub-steps. With this modification, the spurious motions and the sensitivity to the time stepping settings (i.e., the dynamic time step length and number of acoustic sub-steps) are eliminated in both of the example stratocumulus cases. In conclusion, this modification improves the applicability of WRF for LES applications, and possibly other models using similar dynamical core formulations, and also permits the use of longer time steps than in the original code.

  16. An ensemble constrained variational analysis of atmospheric forcing data and its application to evaluate clouds in CAM5: Ensemble 3DCVA and Its Application

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Tang, Shuaiqi; Zhang, Minghua; Xie, Shaocheng

    2016-01-05

    Large-scale atmospheric forcing data can greatly impact the simulations of atmospheric process models including Large Eddy Simulations (LES), Cloud Resolving Models (CRMs) and Single-Column Models (SCMs), and impact the development of physical parameterizations in global climate models. This study describes the development of an ensemble variationally constrained objective analysis of atmospheric large-scale forcing data and its application to evaluate the cloud biases in the Community Atmospheric Model (CAM5). Sensitivities of the variational objective analysis to background data, error covariance matrix and constraint variables are described and used to quantify the uncertainties in the large-scale forcing data. Application of the ensemblemore » forcing in the CAM5 SCM during March 2000 intensive operational period (IOP) at the Southern Great Plains (SGP) of the Atmospheric Radiation Measurement (ARM) program shows systematic biases in the model simulations that cannot be explained by the uncertainty of large-scale forcing data, which points to the deficiencies of physical parameterizations. The SCM is shown to overestimate high clouds and underestimate low clouds. These biases are found to also exist in the global simulation of CAM5 when it is compared with satellite data.« less

  17. Modifications to WRFs dynamical core to improve the treatment of moisture for large-eddy simulations

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Xiao, Heng; Endo, Satoshi; Wong, May; Skamarock, William C.; Klemp, Joseph B.; Fast, Jerome D.; Gustafson, Jr., William I.; Vogelmann, Andrew; Wang, Hailong; Liu, Yangang; et al

    2015-10-29

    Yamaguchi and Feingold (2012) note that the cloud fields in their large-eddy simulations (LESs) of marine stratocumulus using the Weather Research and Forecasting (WRF) model exhibit a strong sensitivity to time stepping choices. In this study, we reproduce and analyze this sensitivity issue using two stratocumulus cases, one marine and one continental. Results show that (1) the sensitivity is associated with spurious motions near the moisture jump between the boundary layer and the free atmosphere, and (2) these spurious motions appear to arise from neglecting small variations in water vapor mixing ratio (qv) in the pressure gradient calculation in themore » acoustic sub-stepping portion of the integration procedure. We show that this issue is remedied in the WRF dynamical core by replacing the prognostic equation for the potential temperature θ with one for the moist potential temperature θm=θ(1+1.61qv), which allows consistent treatment of moisture in the calculation of pressure during the acoustic sub-steps. With this modification, the spurious motions and the sensitivity to the time stepping settings (i.e., the dynamic time step length and number of acoustic sub-steps) are eliminated in both of the example stratocumulus cases. In conclusion, this modification improves the applicability of WRF for LES applications, and possibly other models using similar dynamical core formulations, and also permits the use of longer time steps than in the original code.« less

  18. Assessment of a hybrid finite element and finite volume code for turbulent incompressible flows

    SciTech Connect (OSTI)

    Xia, Yidong; Wang, Chuanjin; Luo, Hong; Christon, Mark; Bakosi, Jozsef

    2015-12-15

    Hydra-TH is a hybrid finite-element/finite-volume incompressible/low-Mach flow simulation code based on the Hydra multiphysics toolkit being developed and used for thermal-hydraulics applications. In the present work, a suite of verification and validation (V&V) test problems for Hydra-TH was defined to meet the design requirements of the Consortium for Advanced Simulation of Light Water Reactors (CASL). The intent for this test problem suite is to provide baseline comparison data that demonstrates the performance of the Hydra-TH solution methods. The simulation problems vary in complexity from laminar to turbulent flows. A set of RANS and LES turbulence models were used in the simulation of four classical test problems. Numerical results obtained by Hydra-TH agreed well with either the available analytical solution or experimental data, indicating the verified and validated implementation of these turbulence models in Hydra-TH. Where possible, we have attempted some form of solution verification to identify sensitivities in the solution methods, and to suggest best practices when using the Hydra-TH code.

  19. A new class of finite element variational multiscale turbulence models for incompressible magnetohydrodynamics

    SciTech Connect (OSTI)

    Sondak, D.; Shadid, J. N.; Oberai, A. A.; Pawlowski, R. P.; Cyr, E. C.; Smith, T. M.

    2015-04-29

    New large eddy simulation (LES) turbulence models for incompressible magnetohydrodynamics (MHD) derived from the variational multiscale (VMS) formulation for finite element simulations are introduced. The new models include the variational multiscale formulation, a residual-based eddy viscosity model, and a mixed model that combines both of these component models. Each model contains terms that are proportional to the residual of the incompressible MHD equations and is therefore numerically consistent. Moreover, each model is also dynamic, in that its effect vanishes when this residual is small. The new models are tested on the decaying MHD Taylor Green vortex at low and high Reynolds numbers. The evaluation of the models is based on comparisons with available data from direct numerical simulations (DNS) of the time evolution of energies as well as energy spectra at various discrete times. Thus a numerical study, on a sequence of meshes, is presented that demonstrates that the large eddy simulation approaches the DNS solution for these quantities with spatial mesh refinement.

  20. A new class of finite element variational multiscale turbulence models for incompressible magnetohydrodynamics

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Sondak, D.; Shadid, J. N.; Oberai, A. A.; Pawlowski, R. P.; Cyr, E. C.; Smith, T. M.

    2015-04-29

    New large eddy simulation (LES) turbulence models for incompressible magnetohydrodynamics (MHD) derived from the variational multiscale (VMS) formulation for finite element simulations are introduced. The new models include the variational multiscale formulation, a residual-based eddy viscosity model, and a mixed model that combines both of these component models. Each model contains terms that are proportional to the residual of the incompressible MHD equations and is therefore numerically consistent. Moreover, each model is also dynamic, in that its effect vanishes when this residual is small. The new models are tested on the decaying MHD Taylor Green vortex at low and highmore » Reynolds numbers. The evaluation of the models is based on comparisons with available data from direct numerical simulations (DNS) of the time evolution of energies as well as energy spectra at various discrete times. Thus a numerical study, on a sequence of meshes, is presented that demonstrates that the large eddy simulation approaches the DNS solution for these quantities with spatial mesh refinement.« less

  1. Large eddy simulation of unsteady lean stratified premixed combustion

    SciTech Connect (OSTI)

    Duwig, C.; Fureby, C.

    2007-10-15

    Premixed turbulent flame-based technologies are rapidly growing in importance, with applications to modern clean combustion devices for both power generation and aeropropulsion. However, the gain in decreasing harmful emissions might be canceled by rising combustion instabilities. Unwanted unsteady flame phenomena that might even destroy the whole device have been widely reported and are subject to intensive studies. In the present paper, we use unsteady numerical tools for simulating an unsteady and well-documented flame. Computations were performed for nonreacting, perfectly premixed and stratified premixed cases using two different numerical codes and different large-eddy-simulation-based flamelet models. Nonreacting simulations are shown to agree well with experimental data, with the LES results capturing the mean features (symmetry breaking) as well as the fluctuation level of the turbulent flow. For reacting cases, the uncertainty induced by the time-averaging technique limited the comparisons. Given an estimate of the uncertainty, the numerical results were found to reproduce well the experimental data in terms both of mean flow field and of fluctuation levels. In addition, it was found that despite relying on different assumptions/simplifications, both numerical tools lead to similar predictions, giving confidence in the results. Moreover, we studied the flame dynamics and particularly the response to a periodic pulsation. We found that above a certain excitation level, the flame dynamic changes and becomes rather insensitive to the excitation/instability amplitude. Conclusions regarding the self-growth of thermoacoustic waves were drawn. (author)

  2. Boundary Layer Cloudiness Parameterizations Using ARM Observations

    SciTech Connect (OSTI)

    Bruce Albrecht

    2004-09-15

    This study used DOE ARM data and facilities to: (1) study macroscopic properties of continental stratus clouds at SGP and the factors controlling these properties, (2) develop a scientific basis for understanding the processes responsible for the formation of boundary layer clouds using ARM observations in conjunction with simple parametric models and LES, and (3) evaluate cumulus cloud characteristics retrieved from the MMCR operating at TWP-Nauru. In addition we have used high resolution 94 GHz observations of boundary layer clouds and precipitation to: (1) develop techniques for using high temporal resolution Doppler velocities to study large-eddy circulations and turbulence in boundary layer clouds and estimate the limitations of using current and past MMCR data for boundary layer cloud studies, (2) evaluate the capability and limitations of the current MMCR data for estimating reflectivity, vertical velocities, and spectral under low- signal-to-noise conditions associated with weak no n-precipitating clouds, (3) develop possible sampling modes for the new MMCR processors to allow for adequate sampling of boundary layer clouds, and (4) retrieve updraft and downdraft structures under precipitating conditions.

  3. Final Technical Report ARM DOE Grant #DE-FG02-03ER63520 Parameterizations of Shortwave Radiactive Properties of Broken Clouds from Satellite and Ground-Based Measurements

    SciTech Connect (OSTI)

    Albrecht, Bruce, A.

    2006-06-19

    This study used DOE ARM data and facilities to: 1) study macroscopic properties of continental stratus clouds at SGP and the factors controlling these properties, 2) develop a scientific basis for understanding the pocesses responsible for the formation of boundary layer clouds using ARM observations in conjunction with simple parametric models and LES, and 3) evaluate cumulus cloud characteristics retrieved retrieved from the MMCR operating at TWP-Nauru. In addition we have used high resolution 94 GHz observations of boundary layer clouds and precipitation to: 1)develop techniques for using high temporal resolution Doppler velocities to study large-eddy circulations and turbulence in boundary layer clouds and estimate the limitations of using current and past MMCR data for boundary layer cloud studies, 2) evaluate the capability and limitation of the current MMCR data for estimating reflectivity, vertical velocities, and spectral under low-signal-to-noise conditions associated with weak non-precipitating clouds, 3) develop possible sampling modes for the new MMCR processors to allow for adequate sampling of boundary layer clouds, and 4) retrieve updraft and downdraft structures under precipitating conditions.

  4. Mesoscale and Large-Eddy Simulations for Wind Energy

    SciTech Connect (OSTI)

    Marjanovic, N

    2011-02-22

    Operational wind power forecasting, turbine micrositing, and turbine design require high-resolution simulations of atmospheric flow over complex terrain. The use of both Reynolds-Averaged Navier Stokes (RANS) and large-eddy (LES) simulations is explored for wind energy applications using the Weather Research and Forecasting (WRF) model. To adequately resolve terrain and turbulence in the atmospheric boundary layer, grid nesting is used to refine the grid from mesoscale to finer scales. This paper examines the performance of the grid nesting configuration, turbulence closures, and resolution (up to as fine as 100 m horizontal spacing) for simulations of synoptically and locally driven wind ramping events at a West Coast North American wind farm. Interestingly, little improvement is found when using higher resolution simulations or better resolved turbulence closures in comparison to observation data available for this particular site. This is true for week-long simulations as well, where finer resolution runs show only small changes in the distribution of wind speeds or turbulence intensities. It appears that the relatively simple topography of this site is adequately resolved by all model grids (even as coarse as 2.7 km) so that all resolutions are able to model the physics at similar accuracy. The accuracy of the results is shown in this paper to be more dependent on the parameterization of the land-surface characteristics such as soil moisture rather than on grid resolution.

  5. A multiscale MDCT image-based breathing lung model with time-varying regional ventilation

    SciTech Connect (OSTI)

    Yin, Youbing, E-mail: youbing-yin@uiowa.edu [Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242 (United States) [Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242 (United States); IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, IA 52242 (United States); Department of Radiology, The University of Iowa, Iowa City, IA 52242 (United States); Choi, Jiwoong, E-mail: jiwoong-choi@uiowa.edu [Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242 (United States) [Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242 (United States); IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, IA 52242 (United States); Hoffman, Eric A., E-mail: eric-hoffman@uiowa.edu [Department of Radiology, The University of Iowa, Iowa City, IA 52242 (United States); Department of Biomedical Engineering, The University of Iowa, Iowa City, IA 52242 (United States); Department of Internal Medicine, The University of Iowa, Iowa City, IA 52242 (United States); Tawhai, Merryn H., E-mail: m.tawhai@auckland.ac.nz [Auckland Bioengineering Institute, The University of Auckland, Auckland (New Zealand); Lin, Ching-Long, E-mail: ching-long-lin@uiowa.edu [Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242 (United States) [Department of Mechanical and Industrial Engineering, The University of Iowa, Iowa City, IA 52242 (United States); IIHR-Hydroscience and Engineering, The University of Iowa, Iowa City, IA 52242 (United States)

    2013-07-01

    A novel algorithm is presented that links local structural variables (regional ventilation and deforming central airways) to global function (total lung volume) in the lung over three imaged lung volumes, to derive a breathing lung model for computational fluid dynamics simulation. The algorithm constitutes the core of an integrative, image-based computational framework for subject-specific simulation of the breathing lung. For the first time, the algorithm is applied to three multi-detector row computed tomography (MDCT) volumetric lung images of the same individual. A key technique in linking global and local variables over multiple images is an in-house mass-preserving image registration method. Throughout breathing cycles, cubic interpolation is employed to ensure C{sub 1} continuity in constructing time-varying regional ventilation at the whole lung level, flow rate fractions exiting the terminal airways, and airway deformation. The imaged exit airway flow rate fractions are derived from regional ventilation with the aid of a three-dimensional (3D) and one-dimensional (1D) coupled airway tree that connects the airways to the alveolar tissue. An in-house parallel large-eddy simulation (LES) technique is adopted to capture turbulent-transitional-laminar flows in both normal and deep breathing conditions. The results obtained by the proposed algorithm when using three lung volume images are compared with those using only one or two volume images. The three-volume-based lung model produces physiologically-consistent time-varying pressure and ventilation distribution. The one-volume-based lung model under-predicts pressure drop and yields un-physiological lobar ventilation. The two-volume-based model can account for airway deformation and non-uniform regional ventilation to some extent, but does not capture the non-linear features of the lung.

  6. Material report in support to RCC-MRX code 2010 stainless steel parts and products

    SciTech Connect (OSTI)

    Ancelet, Olivier; Lebarbe, Thierry; Dubiez-Le Goff, Sophie; Bonne, Dominique; Gelineau, Odile

    2012-07-01

    This paper presents the Material Report dedicated to stainless steels parts and products issued by AFCEN (Association Francaise pour les regles de Conception et de Construction des Materiels des Chaudieres Electro-Nucleaires) in support to RCC-MRx 2010 Code. The RCC-MRx Code is the result of the merger of the RCC-MX 2008, developed in the context of the research reactor Jules Horowitz Reactor project, in the RCC-MR 2007, which set up rules applicable to the design of components operating at high temperature and to the Vacuum Vessel of ITER (a presentation of RCC-MRx 2010 Code is the subject of another paper proposed in this Congress; it explains in particular the status of this Code). This Material Report is part of a set of Criteria of RCC-MRx (this set of Criteria is under construction). The Criteria aim at explaining the design and construction rules of the Code. They cover analyses rules as well as part procurement, welding, methods of tests and examination and fabrication rules. The Material Report particularly provides justifications and explanations on requirements and features dealing with parts and products proposed in the Code. The Material Report contains the following information: Introduction of the grade(s): codes and standards and Reference Procurement Specifications covering parts and products, applications and experience gained, - Physical properties, - Mechanical properties used for design calculations (base metal and welds): basic mechanical properties, creep mechanical properties, irradiated mechanical properties, - Fabrication: experience gained, metallurgy, - Welding: weldability, experience gained during welding and repair procedure qualifications, - Non-destructive examination, - In-service behaviour. In the article, examples of data supplied in the Material Report dedicated to stainless steels will be exposed. (authors)

  7. Multi-scale thermalhydraulic analyses performed in Nuresim and Nurisp projects

    SciTech Connect (OSTI)

    Bestion, D.; Lucas, D.; Anglart, H.; Niceno, B.; Vyskocil, L.

    2012-07-01

    The NURESIM and NURISP successive projects of the 6. and 7. European Framework Programs joined the efforts of 21 partners for developing and validating a reference multi-physics and multi-scale platform for reactor simulation. The platform includes system codes, component codes, and also CFD or CMFD simulation tools. Fine scale CFD simulations are useful for a better understanding of physical processes, for the prediction of small scale geometrical effects and for solving problems that require a fine space and/or time resolution. Many important safety issues usually treated at the system scale may now benefit from investigations at a CFD scale. The Pressurized Thermal Shock is investigated using several simulation scales including Direct Numerical Simulation, Large Eddy Simulation, Very Large Eddy Simulation and RANS approaches. At the end a coupling of system code and CFD is applied. Condensation Induced Water-Hammer was also investigated at both CFD and 1-D scale. Boiling flow in a reactor core up to Departure from Nucleate Boiling or Dry-Out is investigated at scales much smaller than the classical subchannel analysis codes. DNS was used to investigate very local processes whereas CFD in both RANS and LES was used to simulate bubbly flow and Euler-Lagrange simulations were used for annular mist flow investigations. Loss of Coolant Accidents are usually treated by system codes. Some related issues are now revisited at the CFD scale. In each case the progress of the analysis is summarized and the benefit of the multi-scale approach is shown. (authors)

  8. History and Evolution of Control Banding: A Review

    SciTech Connect (OSTI)

    Zalk, D; Nelson, D

    2006-07-19

    Control Banding (CB) strategies offer simplified solutions for controlling worker exposures to constituents often encountered in the workplace. The original CB model was developed within the pharmaceutical industry; however, the modern movement involves models developed for non-experts to input hazard and exposure potential information for bulk chemical processes, receiving control advice as a result. The CB approach utilizes these models for the dissemination of qualitative and semi-quantitative risk assessment tools being developed to complement the traditional industrial hygiene model of air sampling and analysis. It is being applied and tested in small and medium size enterprises (SMEs) within developed countries and industrially developing countries; however, large enterprises (LEs) have also incorporated these strategies within chemical safety programs. Existing research of the components of the most available CB model, the Control of Substances Hazardous to Health (COSHH) Essentials, has shown that exposure bands do not always provide adequate margins of safety, that there is a high rate of under-control errors, that it works better with dusts than with vapors, that there is an inherent inaccuracy in estimating variability, and that when taken together the outcomes of this model may lead to potentially inappropriate workplace confidence in chemical exposure reduction in some operations. Alternatively, large-scale comparisons of industry exposure data to this CB model's outcomes have indicated more promising results with a high correlation seen internationally. With the accuracy of the toxicological ratings and hazard band classification currently in question, their proper reevaluation will be of great benefit to the reliability of existing and future CB models. The need for a more complete analysis of CB model components and, most importantly, a more comprehensive prospective research process remains and will be important in understanding implications of the

  9. Facility design, construction, and operation

    SciTech Connect (OSTI)

    1995-04-01

    France has been disposing of low-level radioactive waste (LLW) at the Centre de Stockage de la Manche (CSM) since 1969 and now at the Centre de Stockage de l`Aube (CSA) since 1992. In France, several agencies and companies are involved in the development and implementation of LLW technology. The Commissariat a l`Energie Atomic (CEA), is responsible for research and development of new technologies. The Agence National pour la Gestion des Dechets Radioactifs is the agency responsible for the construction and operation of disposal facilities and for wastes acceptance for these facilities. Compagnie Generale des Matieres Nucleaires provides fuel services, including uranium enrichment, fuel fabrication, and fuel reprocessing, and is thus one generator of LLW. Societe pour les Techniques Nouvelles is an engineering company responsible for commercializing CEA waste management technology and for engineering and design support for the facilities. Numatec, Inc. is a US company representing these French companies and agencies in the US. In Task 1.1 of Numatec`s contract with Martin Marietta Energy Systems, Numatec provides details on the design, construction and operation of the LLW disposal facilities at CSM and CSA. Lessons learned from operation of CSM and incorporated into the design, construction and operating procedures at CSA are identified and discussed. The process used by the French for identification, selection, and evaluation of disposal technologies is provided. Specifically, the decisionmaking process resulting in the change in disposal facility design for the CSA versus the CSM is discussed. This report provides` all of the basic information in these areas and reflects actual experience to date.

  10. HR Public meeting

    ScienceCinema (OSTI)

    None

    2011-10-06

    Cher(e)s collègues, En collaboration avec le Département HR, le Directeur général a le plaisir de vous convier à une réunion publique qui se tiendra le vendredi 25 juin 2010 à 9h30 dans l?Amphithéâtre principal (Bâtiment 500)*. Un café d?accueil y sera servi à partir de 9h. Cette réunion abordera les thèmes suivants : ? Valeurs de l?Organisation (Directeur général) ? Code de Conduite (Directeur général / Anne-Sylvie Catherin) ? Création du nouveau rôle d?Ombudsperson (Vincent Vuillemin) Ces présentations seront suivies d?une séance de questions-réponses. Nous espérons vous retrouver nombreux le 25 juin ! Meilleures salutations, Anne-Sylvie Catherin Chef du Département des Ressources humaines *Cette réunion sera retransmise simultanément dans l?Amphithéâtre BE de Prévessin (Bâtiment 864) et également disponible à l?adresse suivante : http://webcast.cern.ch -------------------------------------------------------- Dear colleagues, In collaboration with HR Department, the Director-General would like to invite you to an information meeting which will be held on Friday 25 June 2010 at 9:30 am in the Main Auditorium (Building 500)*. A welcome coffee will be available from 9:00 am. During this meeting, information will be given about: ? Organization?s values (Director-General) ? Code of Conduct (Director-General / Anne-Sylvie Catherin) ? New Ombudsperson role (Vincent Vuillemin) These presentations will be followed by a questions & answers session. We look forward to seeing you all on 25 June! Best regards, Anne-Sylvie Catherin Head, Human Resources Department *This meeting will be simultaneously retransmitted in BE Auditorium (Building 864) and available at the following address: http://webcast.cern.ch.

  11. Investigating wind turbine impacts on near-wake flow using profiling Lidar data and large-eddy simulations with an actuator disk model

    SciTech Connect (OSTI)

    Mirocha, Jeffrey D.; Rajewski, Daniel A.; Marjanovic, Nikola; Lundquist, Julie K.; Kosovic, Branko; Draxl, Caroline; Churchfield, Matthew J.

    2015-08-27

    In this study, wind turbine impacts on the atmospheric flow are investigated using data from the Crop Wind Energy Experiment (CWEX-11) and large-eddy simulations (LESs) utilizing a generalized actuator disk (GAD) wind turbine model. CWEX-11 employed velocity-azimuth display (VAD) data from two Doppler lidar systems to sample vertical profiles of flow parameters across the rotor depth both upstream and in the wake of an operating 1.5 MW wind turbine. Lidar and surface observations obtained during four days of July 2011 are analyzed to characterize the turbine impacts on wind speed and flow variability, and to examine the sensitivity of these changes to atmospheric stability. Significant velocity deficits (VD) are observed at the downstream location during both convective and stable portions of four diurnal cycles, with large, sustained deficits occurring during stable conditions. Variances of the streamwise velocity component, σu, likewise show large increases downstream during both stable and unstable conditions, with stable conditions supporting sustained small increases of σu , while convective conditions featured both larger magnitudes and increased variability, due to the large coherent structures in the background flow. Two representative case studies, one stable and one convective, are simulated using LES with a GAD model at 6 m resolution to evaluate the compatibility of the simulation framework with validation using vertically profiling lidar data in the near wake region. Virtual lidars were employed to sample the simulated flow field in a manner consistent with the VAD technique. Simulations reasonably reproduced aggregated wake VD characteristics, albeit with smaller magnitudes than observed, while σu values in the wake are more significantly underestimated. The results illuminate the limitations of using a GAD in combination with coarse model resolution in the simulation of near wake physics, and validation thereof using VAD data.

  12. Investigating wind turbine impacts on near-wake flow using profiling Lidar data and large-eddy simulations with an actuator disk model

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Mirocha, Jeffrey D.; Rajewski, Daniel A.; Marjanovic, Nikola; Lundquist, Julie K.; Kosovic, Branko; Draxl, Caroline; Churchfield, Matthew J.

    2015-08-27

    In this study, wind turbine impacts on the atmospheric flow are investigated using data from the Crop Wind Energy Experiment (CWEX-11) and large-eddy simulations (LESs) utilizing a generalized actuator disk (GAD) wind turbine model. CWEX-11 employed velocity-azimuth display (VAD) data from two Doppler lidar systems to sample vertical profiles of flow parameters across the rotor depth both upstream and in the wake of an operating 1.5 MW wind turbine. Lidar and surface observations obtained during four days of July 2011 are analyzed to characterize the turbine impacts on wind speed and flow variability, and to examine the sensitivity of thesemore » changes to atmospheric stability. Significant velocity deficits (VD) are observed at the downstream location during both convective and stable portions of four diurnal cycles, with large, sustained deficits occurring during stable conditions. Variances of the streamwise velocity component, σu, likewise show large increases downstream during both stable and unstable conditions, with stable conditions supporting sustained small increases of σu , while convective conditions featured both larger magnitudes and increased variability, due to the large coherent structures in the background flow. Two representative case studies, one stable and one convective, are simulated using LES with a GAD model at 6 m resolution to evaluate the compatibility of the simulation framework with validation using vertically profiling lidar data in the near wake region. Virtual lidars were employed to sample the simulated flow field in a manner consistent with the VAD technique. Simulations reasonably reproduced aggregated wake VD characteristics, albeit with smaller magnitudes than observed, while σu values in the wake are more significantly underestimated. The results illuminate the limitations of using a GAD in combination with coarse model resolution in the simulation of near wake physics, and validation thereof using VAD data.« less

  13. A hybrid incremental projection method for thermal-hydraulics applications

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Christon, Mark A.; Bakosi, Jozsef; Nadiga, Balasubramanya T.; Berndt, Markus; Francois, Marianne M.; Stagg, Alan K.; Xia, Yidong; Luo, Hong

    2016-05-04

    In this paper, a new second-order accurate, hybrid, incremental projection method for time-dependent incompressible viscous flow is introduced in this paper. The hybrid finite-element/finite-volume discretization circumvents the well-known Ladyzhenskaya–Babuška–Brezzi conditions for stability, and does not require special treatment to filter pressure modes by either Rhie–Chow interpolation or by using a Petrov–Galerkin finite element formulation. The use of a co-velocity with a high-resolution advection method and a linearly consistent edge-based treatment of viscous/diffusive terms yields a robust algorithm for a broad spectrum of incompressible flows. The high-resolution advection method is shown to deliver second-order spatial convergence on mixed element topology meshes,more » and the implicit advective treatment significantly increases the stable time-step size. The algorithm is robust and extensible, permitting the incorporation of features such as porous media flow, RANS and LES turbulence models, and semi-/fully-implicit time stepping. A series of verification and validation problems are used to illustrate the convergence properties of the algorithm. The temporal stability properties are demonstrated on a range of problems with 2 ≤ CFL ≤ 100. The new flow solver is built using the Hydra multiphysics toolkit. The Hydra toolkit is written in C++ and provides a rich suite of extensible and fully-parallel components that permit rapid application development, supports multiple discretization techniques, provides I/O interfaces, dynamic run-time load balancing and data migration, and interfaces to scalable popular linear solvers, e.g., in open-source packages such as HYPRE, PETSc, and Trilinos.« less

  14. Bluff Body Flow Simulation Using a Vortex Element Method

    SciTech Connect (OSTI)

    Anthony Leonard; Phillippe Chatelain; Michael Rebel

    2004-09-30

    Heavy ground vehicles, especially those involved in long-haul freight transportation, consume a significant part of our nation's energy supply. it is therefore of utmost importance to improve their efficiency, both to reduce emissions and to decrease reliance on imported oil. At highway speeds, more than half of the power consumed by a typical semi truck goes into overcoming aerodynamic drag, a fraction which increases with speed and crosswind. Thanks to better tools and increased awareness, recent years have seen substantial aerodynamic improvements by the truck industry, such as tractor/trailer height matching, radiator area reduction, and swept fairings. However, there remains substantial room for improvement as understanding of turbulent fluid dynamics grows. The group's research effort focused on vortex particle methods, a novel approach for computational fluid dynamics (CFD). Where common CFD methods solve or model the Navier-Stokes equations on a grid which stretches from the truck surface outward, vortex particle methods solve the vorticity equation on a Lagrangian basis of smooth particles and do not require a grid. They worked to advance the state of the art in vortex particle methods, improving their ability to handle the complicated, high Reynolds number flow around heavy vehicles. Specific challenges that they have addressed include finding strategies to accurate capture vorticity generation and resultant forces at the truck wall, handling the aerodynamics of spinning bodies such as tires, application of the method to the GTS model, computation time reduction through improved integration methods, a closest point transform for particle method in complex geometrics, and work on large eddy simulation (LES) turbulence modeling.

  15. Large Eddy Simulation Modeling of Flashback and Flame Stabilization in Hydrogen-Rich Gas Turbines Using a Hierarchical Validation Approach

    SciTech Connect (OSTI)

    Clemens, Noel

    2015-09-30

    This project was a combined computational and experimental effort to improve predictive capability for boundary layer flashback of premixed swirl flames relevant to gas-turbine power plants operating with high-hydrogen-content fuels. During the course of this project, significant progress in modeling was made on four major fronts: 1) use of direct numerical simulation of turbulent flames to understand the coupling between the flame and the turbulent boundary layer; 2) improved modeling capability for flame propagation in stratified pre-mixtures; 3) improved portability of computer codes using the OpenFOAM platform to facilitate transfer to industry and other researchers; and 4) application of LES to flashback in swirl combustors, and a detailed assessment of its capabilities and limitations for predictive purposes. A major component of the project was an experimental program that focused on developing a rich experimental database of boundary layer flashback in swirl flames. Both methane and high-hydrogen fuels, including effects of elevated pressure (1 to 5 atm), were explored. For this project, a new model swirl combustor was developed. Kilohertz-rate stereoscopic PIV and chemiluminescence imaging were used to investigate the flame propagation dynamics. In addition to the planar measurements, a technique capable of detecting the instantaneous, time-resolved 3D flame front topography was developed and applied successfully to investigate the flow-flame interaction. The UT measurements and legacy data were used in a hierarchical validation approach where flows with increasingly complex physics were used for validation. First component models were validated with DNS and literature data in simplified configurations, and this was followed by validation with the UT 1-atm flashback cases, and then the UT high-pressure flashback cases. The new models and portable code represent a major improvement over what was available before this project was initiated.

  16. Development and Utilization of mathematical Optimization in Advanced Fuel Cycle Systems Analysis

    SciTech Connect (OSTI)

    Turinsky, Paul; Hays, Ross

    2011-09-02

    Over the past sixty years, a wide variety of nuclear power technologies have been theorized, investigated and tested to various degrees. These technologies, if properly applied, could provide a stable, long-term, economical source of CO2-free electric power. However, the recycling of nuclear fuel introduces a degree of coupling between reactor systems which must be accounted for when making long term strategic plans. This work investigates the use of a simulated annealing optimization algorithm coupled together with the VISION fuel cycle simulation model in order to identify attractive strategies from economic, evironmental, non-proliferation and waste-disposal perspectives, which each have associated an objective function. The simulated annealing optimization algorithm works by perturbing the fraction of new reactor capacity allocated to each available reactor type (using a set of heuristic rules) then evaluating the resulting deployment scenario outcomes using the VISION model and the chosen objective functions. These new scenarios, which are either accepted or rejected according the the Metropolis Criterion, are then used as the basis for further perturbations. By repeating this process several thousand times, a family of near-optimal solutions are obtained. Preliminary results from this work using a two-step, Once-through LWR to Full-recycle/FRburner deployment scenario with exponentially increasing electric demand indicate that the algorithm is capable of #12;nding reactor deployment pro#12;les that reduce the long-term-heat waste disposal burden relative to an initial reference scenario. Further work is under way to re#12;ne the current results and to extend them to include the other objective functions and to examine the optimization trade-o#11;s that exist between these di#11;erent objectives.

  17. The SM and NLO Multileg Working Group: Summary Report

    SciTech Connect (OSTI)

    Andersen, J.R.; Archibald, J.; Badger, S.; Ball, R.D.; Bevilacqua, G.; Bierenbaum, I.; Binoth, T.; Boudjema, F.; Boughezal, R.; Bredenstein, A.; Britto, R.; Campanelli, M.; Campbell, J.; Carminati, L.; Chachamis, G.; Ciulli, V.; Cullen, G.; Czakon, M.; Del Debbio, L.; Denner, A.; Dissertori, G.; /Edinburgh U. /Zurich, ETH /Michigan State U. /CAFPE, Granada /CERN /Durham U., IPPP /DESY, Zeuthen /Democritos Nucl. Res. Ctr. /Valencia U., IFIC /Annecy, LAPTH /Zurich U. /KEK, Tsukuba /Saclay, SPhT /University Coll. London /Fermilab /INFN, Milan /Milan U. /PSI, Villigen /Florence U. /INFN, Florence /RWTH Aachen U.

    2012-04-10

    After years of waiting, and after six Les Houches workshops, the era of LHC running is finally upon us, albeit at a lower initial center-of-mass energy than originally planned. Thus, there has been a great sense of anticipation from both the experimental and theoretical communities. The last two years, in particular, have seen great productivity in the area of multi-parton calculations at leading order (LO), next-to-leading order (NLO) and next-to-next-to-leading order (NNLO), and this productivity is reflected in the proceedings of the NLM group. Both religions, Feynmanians and Unitarians, as well as agnostic experimenters, were well-represented in both the discussions at Les Houches, and in the contributions to the write-up. Next-to-leading order (NLO) is the first order at which the normalization, and in some cases the shape, of perturbative cross sections can be considered reliable. This can be especially true when probing extreme kinematic regions, as for example with boosted Higgs searches considered in several of the contributions to this writeup. A full understanding for both standard model and beyond the standard model physics at the LHC requires the development of fast, reliable programs for the calculation of multi-parton final states at NLO. There have been many advances in the development of NLO techniques, standardization and automation for such processes and this is reflected in the contributions to the first section of this writeup. Many calculations have previously been performed with the aid of semi-numerical techniques. Such techniques, although retaining the desired accuracy, lead to codes which are slow to run. Advances in the calculation of compact analytic expressions for Higgs + 2 jets have resulted in the development of much faster codes, which extend the phenomenology that can be conducted, as well as making the code available to the public for the first time. A prioritized list of NLO cross sections was assembled at Les Houches in 2005

  18. HR Public meeting

    ScienceCinema (OSTI)

    None

    2011-10-06

    Cher(e)s collègues, En collaboration avec le Département HR, le Directeur général a le plaisir de vous convier à une réunion publique qui se tiendra le vendredi 25 juin 2010 à 9h30 dans l?Amphithéâtre principal (Bâtiment 500)*. Un café d?accueil y sera servi à partir de 9h. Cette réunion abordera les thèmes suivants : ? Valeurs de l?Organisation (Directeur général) ? Code de Conduite (Directeur général / Anne-Sylvie Catherin) ? Création du nouveau rôle d?Ombudsperson (Vincent Vuillemin) Ces présentations seront suivies d?une séance de questions-réponses. Nous espérons vous retrouver nombreux le 25 juin ! Meilleures salutations, Anne-Sylvie Catherin Chef du Département des Ressources humaines *Cette réunion sera retransmise simultanément dans l?Amphithéâtre BE de Prévessin (Bâtiment 864) et également disponible à l?adresse suivante : http://webcast.cern.ch -------------------------------------------------------- Dear colleagues, In collaboration with HR Department, the Director-General would like to invite you to an information meeting which will be held on Friday 25 June 2010 at 9:30 am in the Main Auditorium (Building 500)*. A welcome coffee will be available from 9:00 am. During this meeting, information will be given about: ? Organization?s values (Director-General) ? Code of Conduct (Director-General / Anne-Sylvie Catherin) ? New Ombudsperson role (Vincent Vuillemin) These presentations will be followed by a questions & answers session. We look forward to seeing you all on 25 June! Best regards, Anne-Sylvie Catherin Head, Human Resources Department *This meeting will be simultaneously retransmitted in BE Auditorium (Building 864) and available at the following address: http://webcast.cern.ch.

  19. Investigation on the Core Bypass Flow in a Very High Temperature Reactor

    SciTech Connect (OSTI)

    Hassan, Yassin

    2013-10-22

    Uncertainties associated with the core bypass flow are some of the key issues that directly influence the coolant mass flow distribution and magnitude, and thus the operational core temperature profiles, in the very high-temperature reactor (VHTR). Designers will attempt to configure the core geometry so the core cooling flow rate magnitude and distribution conform to the design values. The objective of this project is to study the bypass flow both experimentally and computationally. Researchers will develop experimental data using state-of-the-art particle image velocimetry in a small test facility. The team will attempt to obtain full field temperature distribution using racks of thermocouples. The experimental data are intended to benchmark computational fluid dynamics (CFD) codes by providing detailed information. These experimental data are urgently needed for validation of the CFD codes. The following are the project tasks: • Construct a small-scale bench-top experiment to resemble the bypass flow between the graphite blocks, varying parameters to address their impact on bypass flow. Wall roughness of the graphite block walls, spacing between the blocks, and temperature of the blocks are some of the parameters to be tested. • Perform CFD to evaluate pre- and post-test calculations and turbulence models, including sensitivity studies to achieve high accuracy. • Develop the state-of-the art large eddy simulation (LES) using appropriate subgrid modeling. • Develop models to be used in systems thermal hydraulics codes to account and estimate the bypass flows. These computer programs include, among others, RELAP3D, MELCOR, GAMMA, and GAS-NET. Actual core bypass flow rate may vary considerably from the design value. Although the uncertainty of the bypass flow rate is not known, some sources have stated that the bypass flow rates in the Fort St. Vrain reactor were between 8 and 25 percent of the total reactor mass flow rate. If bypass flow rates are on the

  20. THE SURFACE-MEDIATED UNFOLDING KINETICS OF GLOBULAR PROTEINS IS DEPENDENT ON MOLECULAR WEIGHT AND TEMPERATURE

    SciTech Connect (OSTI)

    Patananan, A.N.; Goheen, S.C.

    2008-01-01

    The adsorption and unfolding pathways of proteins on rigid surfaces are essential in numerous complex processes associated with biomedical engineering, nanotechnology, and chromatography. It is now well accepted that the kinetics of unfolding are characterized by chemical and physical interactions dependent on protein deformability and structure, as well as environmental pH, temperature, and surface chemistry. Although this fundamental process has broad implications in medicine and industry, little is known about the mechanism because of the atomic lengths and rapid time scales involved. Therefore, the unfolding kinetics of myoglobin, β-glucosidase, and ovalbumin were investigated by adsorbing the globular proteins to non-porous cationic polymer beads. The protein fractions were adsorbed at different residence times (0, 9, 10, 20, and 30 min) at near-physiological conditions using a gradient elution system similar to that in high-performance liquid chromatography. The elution profi les and retention times were obtained by ultraviolet/visible spectrophotometry. A decrease in recovery was observed with time for almost all proteins and was attributed to irreversible protein unfolding on the non-porous surfaces. These data, and those of previous studies, fi t a positively increasing linear trend between percent unfolding after a fi xed (9 min) residence time (71.8%, 31.1%, and 32.1% of myoglobin, β-glucosidase, and ovalbumin, respectively) and molecular weight. Of all the proteins examined so far, only myoglobin deviated from this trend with higher than predicted unfolding rates. Myoglobin also exhibited an increase in retention time over a wide temperature range (0°C and 55°C, 4.39 min and 5.74 min, respectively) whereas ovalbumin and β-glucosidase did not. Further studies using a larger set of proteins are required to better understand the physiological and physiochemical implications of protein unfolding kinetics. This study confi rms that surface

  1. Biologically based multistage modeling of radiation effects

    SciTech Connect (OSTI)

    William Hazelton; Suresh Moolgavkar; E. Georg Luebeck

    2005-08-30

    This past year we have made substantial progress in modeling the contribution of homeostatic regulation to low-dose radiation effects and carcinogenesis. We have worked to refine and apply our multistage carcinogenesis models to explicitly incorporate cell cycle states, simple and complex damage, checkpoint delay, slow and fast repair, differentiation, and apoptosis to study the effects of low-dose ionizing radiation in mouse intestinal crypts, as well as in other tissues. We have one paper accepted for publication in ''Advances in Space Research'', and another manuscript in preparation describing this work. I also wrote a chapter describing our combined cell-cycle and multistage carcinogenesis model that will be published in a book on stochastic carcinogenesis models edited by Wei-Yuan Tan. In addition, we organized and held a workshop on ''Biologically Based Modeling of Human Health Effects of Low dose Ionizing Radiation'', July 28-29, 2005 at Fred Hutchinson Cancer Research Center in Seattle, Washington. We had over 20 participants, including Mary Helen Barcellos-Hoff as keynote speaker, talks by most of the low-dose modelers in the DOE low-dose program, experimentalists including Les Redpath (and Mary Helen), Noelle Metting from DOE, and Tony Brooks. It appears that homeostatic regulation may be central to understanding low-dose radiation phenomena. The primary effects of ionizing radiation (IR) are cell killing, delayed cell cycling, and induction of mutations. However, homeostatic regulation causes cells that are killed or damaged by IR to eventually be replaced. Cells with an initiating mutation may have a replacement advantage, leading to clonal expansion of these initiated cells. Thus we have focused particularly on modeling effects that disturb homeostatic regulation as early steps in the carcinogenic process. There are two primary considerations that support our focus on homeostatic regulation. First, a number of epidemiologic studies using multistage

  2. Virtual Flow Simulator

    Energy Science and Technology Software Center (OSTI)

    2015-10-05

    Virtual Flow Simulator (VFS) is a state-of-the-art computational fluid mechanics (CFD) package that is capable of simulating multi-physics/multi-phase flows with the most advanced turbulence models (RANS, LES) over complex terrains. The flow solver is based on the Curvilinear Immersed Boundary (CURVIB) method to handle geometrically complex and moving domains. Different modules of the VFS package can provide different simulation capabilities for specific applications ranging from the fluid-structure interaction (FSI) of solid and deformable bodies, themore » two-phase free surface flow solver based on the level set method for ocean waves, sediment transport models in rivers and the large-scale models of wind farms based on actuator lines and surfaces. All numerical features of VFS package have been validated with known analytical and experimental data as reported in the related journal articles. VFS package is suitable for a broad range of engineering applications within different industries. VFS has been used in different projects with applications in wind and hydrokinetic energy, offshore and near-shore ocean studies, cardiovascular and biological flows, and natural streams and river morphodynamics. Over the last decade, the development of VFS has been supported and assisted with the help of various United States companies and federal agencies that are listed in the sponsor lists. In this version, VFS-Wind contains all the necessary modeling tools for wind energy applications, including land-based and offshore wind farms. VFS is highly scalable to run on either desktop computers or high performance clusters (up to 16,000 CPUs). This released version comes with a detailed user’s manual and a set of case studies designed to facilitate the learning of the various aspects of the code in a comprehensive manner. The included documentation and support material has been elaborated in a collaboration effort with Sandia National Labs under the contract DE-EE0005482

  3. Validation/Uncertainty Quantification for Large Eddy Simulations of the heat flux in the Tangentially Fired Oxy-Coal Alstom Boiler Simulation Facility

    SciTech Connect (OSTI)

    Smith, P.J.; Eddings, E.G.; Ring, T.; Thornock, J.; Draper, T.; Isaac, B.; Rezeai, D.; Toth, P.; Wu, Y.; Kelly, K.

    2014-08-01

    The objective of this task is to produce predictive capability with quantified uncertainty bounds for the heat flux in commercial-scale, tangentially fired, oxy-coal boilers. Validation data came from the Alstom Boiler Simulation Facility (BSF) for tangentially fired, oxy-coal operation. This task brings together experimental data collected under Alstom’s DOE project for measuring oxy-firing performance parameters in the BSF with this University of Utah project for large eddy simulation (LES) and validation/uncertainty quantification (V/UQ). The Utah work includes V/UQ with measurements in the single-burner facility where advanced strategies for O2 injection can be more easily controlled and data more easily obtained. Highlights of the work include: • Simulations of Alstom’s 15 megawatt (MW) BSF, exploring the uncertainty in thermal boundary conditions. A V/UQ analysis showed consistency between experimental results and simulation results, identifying uncertainty bounds on the quantities of interest for this system (Subtask 9.1) • A simulation study of the University of Utah’s oxy-fuel combustor (OFC) focused on heat flux (Subtask 9.2). A V/UQ analysis was used to show consistency between experimental and simulation results. • Measurement of heat flux and temperature with new optical diagnostic techniques and comparison with conventional measurements (Subtask 9.3). Various optical diagnostics systems were created to provide experimental data to the simulation team. The final configuration utilized a mid-wave infrared (MWIR) camera to measure heat flux and temperature, which was synchronized with a high-speed, visible camera to utilize two-color pyrometry to measure temperature and soot concentration. • Collection of heat flux and temperature measurements in the University of Utah’s OFC for use is subtasks 9.2 and 9.3 (Subtask 9.4). Several replicates were carried to better assess the experimental error. Experiments were specifically designed for the

  4. Numerical and Experimental Study of Mixing Processes Associated with Hydrogen and High Hydrogen Content Fuels

    SciTech Connect (OSTI)

    McDonell, Vincent; Hill, Scott; Akbari, Amin; McDonell, Vincent

    2011-09-30

    As simulation capability improves exponentially with increasingly more cost effective CPUs and hardware, it can be used ?routinely? for engineering applications. Many commercial products are available and they are marketed as increasingly powerful and easy to use. The question remains as to the overall accuracy of results obtained. To support the validation of the CFD, a hierarchical experiment was established in which the type of fuel injection (radial, axial) as well as level of swirl (non-swirling, swirling) could be systematically varied. The effort was limited to time efficient approaches (i.e., generally RANS approaches) although limited assessment of time resolved methods (i.e., unsteady RANS and LES) were considered. Careful measurements of the flowfield velocity and fuel concentration were made using both intrusive and non-intrusive methods. This database was then used as the basis for the assessment of the CFD approach. The numerical studies were carried out with a statistically based matrix. As a result, the effect of turbulence model, fuel type, axial plane, turbulent Schmidt number, and injection type could be studied using analysis of variance. The results for the non-swirling cases could be analyzed as planned, and demonstrate that turbulence model selection, turbulence Schmidt number, and the type of injection will strongly influence the agreement with measured values. Interestingly, the type of fuel used (either hydrogen or methane) has no influence on the accuracy of the simulations. For axial injection, the selection of proper turbulence Schmidt number is important, whereas for radial injection, the results are relatively insensitive to this parameter. In general, it was found that the nature of the flowfield influences the performance of the predictions. This result implies that it is difficult to establish a priori the ?best? simulation approach to use. However, the insights from the relative orientation of the jet and flow do offer some

  5. ACHILLES: Heat Transfer in PWR Core During LOCA Reflood Phase

    Energy Science and Technology Software Center (OSTI)

    2013-11-01

    1. NAME AND TITLE OF DATA LIBRARY ACHILLES -Heat Transfer in PWR Core During LOCA Reflood Phase. 2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS N/A 3. CONTRIBUTOR AEA Technology, Winfrith Technology Centre, Dorchester DT2 8DH United Kingdom through the OECD Nuclear Energy Agency Data Bank, Issy-les-Moulineaux, France. 4. DESCRIPTION OF TEST FACILITY The most important features of the Achilles rig were the shroud vessel, which contained the test section, and the downcomer. These maymore » be thought of as representing the core barrel and the annular downcomer in the reactor pressure vessel. The test section comprises a cluster of 69 rods in a square array within a circular shroud vessel. The rod diameter and pitch (9.5 mm and 12.6 mm) were typical of PWR dimensions. The internal diameter of the shroud vessel was 128 mm. Each rod was electrically heated over a length of 3.66 m, which is typical of the nuclear heated length in a PWR fuel rod, and each contained 6 internal thermocouples. These were arranged in one of 8 groupings which concentrated the thermocouples in different axial zones. The spacer grids were at prototypic PWR locations. Each grid had two thermocouples attached to its trailing edge at radial locations. The axial power profile along the rods was an 11 step approximation to a "chopped cosine". The shroud vessel had 5 heating zones whose power could be independently controlled. 5. DESCRIPTION OF TESTS The Achilles experiments investigated the heat transfer in the core of a Pressurized Water Reactor during the re-flood phase of a postulated large break loss of coolant accident. The results provided data to validate codes and to improve modeling. Different types of experiments were carried out which included single phase cooling, re-flood under low flow conditions, level swell and re-flood under high flow conditions. Three series of experiments were performed. The first and the third used the same test section but the second used another test section

  6. ACHILLES: Heat Transfer in PWR Core During LOCA Reflood Phase

    SciTech Connect (OSTI)

    2013-11-01

    1. NAME AND TITLE OF DATA LIBRARY ACHILLES -Heat Transfer in PWR Core During LOCA Reflood Phase. 2. NAME AND TITLE OF DATA RETRIEVAL PROGRAMS N/A 3. CONTRIBUTOR AEA Technology, Winfrith Technology Centre, Dorchester DT2 8DH United Kingdom through the OECD Nuclear Energy Agency Data Bank, Issy-les-Moulineaux, France. 4. DESCRIPTION OF TEST FACILITY The most important features of the Achilles rig were the shroud vessel, which contained the test section, and the downcomer. These may be thought of as representing the core barrel and the annular downcomer in the reactor pressure vessel. The test section comprises a cluster of 69 rods in a square array within a circular shroud vessel. The rod diameter and pitch (9.5 mm and 12.6 mm) were typical of PWR dimensions. The internal diameter of the shroud vessel was 128 mm. Each rod was electrically heated over a length of 3.66 m, which is typical of the nuclear heated length in a PWR fuel rod, and each contained 6 internal thermocouples. These were arranged in one of 8 groupings which concentrated the thermocouples in different axial zones. The spacer grids were at prototypic PWR locations. Each grid had two thermocouples attached to its trailing edge at radial locations. The axial power profile along the rods was an 11 step approximation to a "chopped cosine". The shroud vessel had 5 heating zones whose power could be independently controlled. 5. DESCRIPTION OF TESTS The Achilles experiments investigated the heat transfer in the core of a Pressurized Water Reactor during the re-flood phase of a postulated large break loss of coolant accident. The results provided data to validate codes and to improve modeling. Different types of experiments were carried out which included single phase cooling, re-flood under low flow conditions, level swell and re-flood under high flow conditions. Three series of experiments were performed. The first and the third used the same test section but the second used another test section, similar in

  7. Fuel-Flexible Combustion System for Co-production Plant Applications

    SciTech Connect (OSTI)

    Joel Haynes; Justin Brumberg; Venkatraman Iyer; Jonathan Janssen; Ben Lacy; Matt Mosbacher; Craig Russell; Ertan Yilmaz; Williams York; Willy Ziminsky; Tim Lieuwen; Suresh Menon; Jerry Seitzman; Ashok Anand; Patrick May

    2008-12-31

    not have the diluent requirements of Prototype-1 and was demonstrated at targeted gas turbine conditions. The TVC combustor, Prototype-2, premixes the syngas with air for low emission performance. The combustor was designed for operation with syngas and no additional diluents. The combustor was successfully operated at targeted gas turbine conditions. Another goal of the program was to advance the status of development tools for syngas systems. In Task 3 a syngas flame evaluation facility was developed. Fundamental data on syngas flame speeds and flame strain were obtained at pressure for a wide range of syngas fuels with preheated air. Several promising reduced order kinetic mechanisms were compared with the results from the evaluation facility. The mechanism with the best agreement was selected for application to syngas combustor modeling studies in Task 6. Prototype-1 was modeled using an advanced LES combustion code. The tools and combustor technology development culminate in a full-scale demonstration of the most promising technology in Task 8. The combustor was operated at engine conditions and evaluated against the various engine performance requirements.

  8. Test Problem: Tilted Rayleigh-Taylor for 2-D Mixing Studies

    SciTech Connect (OSTI)

    Andrews, Malcolm J.; Livescu, Daniel; Youngs, David L.

    2012-08-14

    reasonable quality photographic data. The photographs in Figure 2 also reveal the appearance of a boundary layer at the left and right walls; this boundary layer has not been included in the test problem as preliminary calculations suggested it had a negligible effect on plume penetration and RT mixing. The significance of this test problem is that, unlike planar RT experiments such as the Rocket-Rig (Youngs, 1984), Linear Electric Motor - LEM (Dimonte, 1990), or the Water Tunnel (Andrews, 1992), the Tilted-Rig is a unique two-dimensional RT mixing experiment that has experimental data and now (in this TP) Direct Numerical Simulation data from Livescu and Wei. The availability of DNS data for the tilted-rig has made this TP viable as it provides detailed results for comparison purposes. The purpose of the test problem is to provide 3D simulation results, validated by comparison with experiment, which can be used for the development and validation of 2D RANS models. When such models are applied to 2D flows, various physics issues are raised such as double counting, combined buoyancy and shear, and 2-D strain, which have not yet been adequately addressed. The current objective of the test problem is to compare key results, which are needed for RANS model validation, obtained from high-Reynolds number DNS, high-resolution ILES or LES with explicit sub-grid-scale models. The experiment is incompressible and so is directly suitable for algorithms that are designed for incompressible flows (e.g. pressure correction algorithms with multi-grid); however, we have extended the TP so that compressible algorithms, run at low Mach number, may also be used if careful consideration is given to initial pressure fields. Thus, this TP serves as a useful tool for incompressible and compressible simulation codes, and mathematical models. In the remainder of this TP we provide a detailed specification; the next section provides the underlying assumptions for the TP, fluids, geometry details