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Title: Terascale Direct Numerical Simulations of Turbulent Combustion: Capabilities and Limits (PReSS Talk)

The rapid growth in computational capabilities has provided great opportunities for direct numerical simulations (DNS) of turbulent combustion, a type of simulations without any turbulence model. Withmore » the help of terascale high performance supercomputing (HPC) resources, we are now able to provide fundamental insight into turbulence-chemistry interaction in simple laboratory-scale turbulent flames with detailed chemistry using three-dimensional (3D) DNS. However, the actual domain size of 3D-DNS is still limited within {approx} O(10 cm{sup 3}) due to its tremendously high grid resolution required to resolve the smallest turbulent length scale as well as flame structures. Moreover, 3D-DNS will require more computing powers to investigate next-generation engines, of which operating conditions will be characterized by higher pressures, lower temperatures, and higher levels of dilution. In this talk, I will discuss the capabilities and limits of DNS of turbulent combustion and present some results of ignition/extinction characteristics of a highly diluted hydrogen flame counter-flowing against heated air. The results of our recent 3D-DNS of a spatially-developing turbulent lifted hydrogen jet flame in heated coflow will also be presented. The 3D-DNS was performed at a jet Reynolds number of 11,000 with {approx} 1 billion grid points, which required 3.5 million CPU hours on Cray XT3/XT4 at Oak Ridge National Laboratories.« less
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Title: Terascale Direct Numerical Simulations of Turbulent Combustion: Capabilities and Limits (PReSS Talk)
Authors:
Publication Date: 2009-03-26
OSTI Identifier: 1008021
DOE Contract Number: AC04-94-AL85000
Other Number(s): TRN: US201122%%11
Resource Type: Multimedia
Resource Relation: Conference: Post-Doctoral and Recent Staff Seminar Series (PReSS), Sandia National Laboratories, Albuquerque, New Mexico (United States), presented on March 26, 2009
Research Org: SNL (Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States))
Sponsoring Org: USDOE Office of Science (SC)
Subject: 08 HYDROGEN ; AIR ; CHEMISTRY ; COMBUSTION ; DILUTION ; ENGINES ; FLAMES ; HYDROGEN ; PERFORMANCE ; RESOLUTION ; REYNOLDS NUMBER ; SANDIA NATIONAL LABORATORIES ; TURBULENCE
Country of Publication: United States
Language: English
Run Time: 0:42:13
System Entry Date: 2016-01-27