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Title: Parallel processing algorithms for hydrocodes on a computer with MIMD architecture (DENELCOR's HEP)

Abstract

In real time simulation/prediction of complex systems such as water-cooled nuclear reactors, if reactor operators had fast simulator/predictors to check the consequences of their operations before implementing them, events such as the incident at Three Mile Island might be avoided. However, existing simulator/predictors such as RELAP run slower than real time on serial computers. It appears that the only way to overcome the barrier to higher computing rates is to use computers with architectures that allow concurrent computations or parallel processing. The computer architecture with the greatest degree of parallelism is labeled Multiple Instruction Stream, Multiple Data Stream (MIMD). An example of a machine of this type is the HEP computer by DENELCOR. It appears that hydrocodes are very well suited for parallelization on the HEP. It is a straightforward exercise to parallelize explicit, one-dimensional Lagrangean hydrocodes in a zone-by-zone parallelization. Similarly, implicit schemes can be parallelized in a zone-by-zone fashion via an a priori, symbolic inversion of the tridiagonal matrix that arises in an implicit scheme. These techniques are extended to Eulerian hydrocodes by using Harlow's rezone technique. The extension from single-phase Eulerian to two-phase Eulerian is straightforward. This step-by-step extension leads to hydrocodes with zone-by-zone parallelization that aremore » capable of two-phase flow simulation. Extensions to two and three spatial dimensions can be achieved by operator splitting. It appears that a zone-by-zone parallelization is the best way to utilize the capabilities of an MIMD machine. 40 references.« less

Authors:
Publication Date:
Research Org.:
Idaho National Engineering Lab., Idaho Falls (USA)
OSTI Identifier:
5487001
Report Number(s):
EGG-SAAM-6452
ON: DE84004941
DOE Contract Number:  
AC07-76ID01570
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; TWO-PHASE FLOW; COMPUTER CALCULATIONS; WATER COOLED REACTORS; ALGORITHMS; COMPUTERS; DATA PROCESSING; LAGRANGE EQUATIONS; SIMULATION; DIFFERENTIAL EQUATIONS; EQUATIONS; FLUID FLOW; MATHEMATICAL LOGIC; PARTIAL DIFFERENTIAL EQUATIONS; PROCESSING; REACTORS; 220900* - Nuclear Reactor Technology- Reactor Safety

Citation Formats

Hicks, D L. Parallel processing algorithms for hydrocodes on a computer with MIMD architecture (DENELCOR's HEP). United States: N. p., 1983. Web.
Hicks, D L. Parallel processing algorithms for hydrocodes on a computer with MIMD architecture (DENELCOR's HEP). United States.
Hicks, D L. Tue . "Parallel processing algorithms for hydrocodes on a computer with MIMD architecture (DENELCOR's HEP)". United States.
@article{osti_5487001,
title = {Parallel processing algorithms for hydrocodes on a computer with MIMD architecture (DENELCOR's HEP)},
author = {Hicks, D L},
abstractNote = {In real time simulation/prediction of complex systems such as water-cooled nuclear reactors, if reactor operators had fast simulator/predictors to check the consequences of their operations before implementing them, events such as the incident at Three Mile Island might be avoided. However, existing simulator/predictors such as RELAP run slower than real time on serial computers. It appears that the only way to overcome the barrier to higher computing rates is to use computers with architectures that allow concurrent computations or parallel processing. The computer architecture with the greatest degree of parallelism is labeled Multiple Instruction Stream, Multiple Data Stream (MIMD). An example of a machine of this type is the HEP computer by DENELCOR. It appears that hydrocodes are very well suited for parallelization on the HEP. It is a straightforward exercise to parallelize explicit, one-dimensional Lagrangean hydrocodes in a zone-by-zone parallelization. Similarly, implicit schemes can be parallelized in a zone-by-zone fashion via an a priori, symbolic inversion of the tridiagonal matrix that arises in an implicit scheme. These techniques are extended to Eulerian hydrocodes by using Harlow's rezone technique. The extension from single-phase Eulerian to two-phase Eulerian is straightforward. This step-by-step extension leads to hydrocodes with zone-by-zone parallelization that are capable of two-phase flow simulation. Extensions to two and three spatial dimensions can be achieved by operator splitting. It appears that a zone-by-zone parallelization is the best way to utilize the capabilities of an MIMD machine. 40 references.},
doi = {},
url = {https://www.osti.gov/biblio/5487001}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1983},
month = {11}
}

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