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Title: MP-1 Issues for Plasma Spraying

Authors:
 [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
DOE/LANL
OSTI Identifier:
1143990
Report Number(s):
LA-UR-14-25492
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
Materials Science(36)

Citation Formats

Hollis, Kendall Jon. MP-1 Issues for Plasma Spraying. United States: N. p., 2014. Web. doi:10.2172/1143990.
Hollis, Kendall Jon. MP-1 Issues for Plasma Spraying. United States. doi:10.2172/1143990.
Hollis, Kendall Jon. Fri . "MP-1 Issues for Plasma Spraying". United States. doi:10.2172/1143990. https://www.osti.gov/servlets/purl/1143990.
@article{osti_1143990,
title = {MP-1 Issues for Plasma Spraying},
author = {Hollis, Kendall Jon},
abstractNote = {},
doi = {10.2172/1143990},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jul 18 00:00:00 EDT 2014},
month = {Fri Jul 18 00:00:00 EDT 2014}
}

Technical Report:

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  • The Regional Oxidant Model (ROM) has been developed and enhanced over the past decade by the U.S. Environmental Protection Agency (EPA) in response to the need for an appropriate simulation model capable of simulating multi-day chemical effects and the long-range transport of ozone and its percursors. The main purpose of the model is to test the effectiveness of emission control strategies on regional and urban airshed ozone concentrations. The EPA currently uses ROM2.2 to address many issues related to the 1990 revisions of the Clean Air Act with different modeling regions including the SUPROXA domain that is essentially the easternmore » half of the U.S. and southeast Canada. The large file sizes and amount of processing creates a proportionately large demand for model throughput and other computational resources, resulting in a critical need to have an optimized version of the core model on a high performance platform. The paper discusses efforts in optimizing the ROM core model on the Cray Y-MP and subsequently on the MasPar MP-1.« less
  • MELCOR is a fully integrated, engineering-level computer code being developed at Sandia National Laboratories for the USNRC, that models the entire spectrum of severe accident phenomena in a unified framework for both BWRs and PWRs. As a part of an ongoing assessment program, MELCOR has been used to model the MP-1 and MP-2 experiments, which provided data for late-phase melt progression in PWR geometries. Core temperature predicted by MELCOR were within 250--500 K of measured data in both MP-1 and MP-2. Relocation in the debris bed and metallic crust regions of MP-2 was predicted accurately compared to PIE data. Temperaturemore » gradients in lower portions of the test bundle were not predicted well in both MP-1 and MP-2, due to the lack of modeling of the heat transfer path to the cooling jacket in those portions of the test bundles. Fifteen sensitivity studies were run on various core (COR), control volume hydrodynamics (CVH) and heat structures (HS) package parameters. No unexpected sensitivities were found, and in particular there were no sensitivities to reduced time step, finer nodalization or to computer platform. Calculations performed by the DEBRIS and TAC2D codes for MP-1 and MP-2 showed better agreement with measured data than those performed by MELCOR. This was expected, through, due to the fully 2-dimensional modeling used in the other codes.« less
  • This Validation Summary Report describes the extent to which a specific Ada compiler conforms to the Ada Standard, ANSI/MIL-STD-1815A. The report explains all technical terms used within it and thoroughly reports the results of testing this compiler using the Ada Compiler Validation Capability. An Ada compiler must be implemented according to the Ada Standard, and any implementation-dependent features must conform to the requirements of the Ada Standard. The Ada Standard must be implemented in its entirety, and nothing can be implemented that is not in the Standard. Even though all validated Ada compilers conform to the Ada Standard, it mustmore » be understood that some differences do exist between implementations. The Ada Standard permits some implementation dependencies - for example, the maximum length of identifiers or the maximum values of integer types. Other differences between compilers result from the characteristics of particular operating systems, hardware, or implementation strategies. All the dependencies observed during the process of testing this compiler are given in this report. The information in this report is derived from the test results produced during validation testing. The validation process includes submitting a suite of standardized tests, the ACVC, as inputs to an Ada compiler and evaluating the results.« less
  • This paper describes some early experience with converting a plasma physics simulation program to the CRAY X-MP, a current multiple instruction, multiple data (MIMD) computer consisting of two processors with architecture similar to that of the CRAY-1. The computer program used in this study is an all Fortran version of SELF, a two species, one space, two velocity, electromagnetic, Newtonian, particle in cell, plasma simulation code. The approach to converting SELF to use both processors of the CRAY X-MP is described in some detail. The resulting multiprocessor version of SELF is nearly a factor of two faster in real timemore » than the single processor version. The multiprocessor version obtains 58.2+-.1 seconds of central processor time in 30+-.5 seconds of real time. For comparison, the CRAY-1 execution time if 74.5 seconds. For SELF, which is mostly scalar coding, the CRAY X-MP is about 2.5 times faster overall than the CRAY-1.« less