Parallelization of an Unstructed Grid, Hydrodynamic-Diffusion Code.

Shestakov, A. I. ; Milovich, J. L.

Technical Information Center Oak Ridge Tennessee

关键词: Hydrodynamics;    Parallel processing;    Diffusion;    Grids;    Finite element method;   

RP-ID  :  DE20052590

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We describe the parallelization of a three dimensional, unstructured grid, finite element code which solves hyperbolic conservation laws for mass, momentum, and energy, and diffusion equations modeling heat conduction and radiation transport. Explicit temporal differencing advances the cell-based gasdynamic equations. Diffusion equations use fully implicit differencing of nodal variables which leads to large, sparse, symmetric, and positive definite matrices. Because of the unstructured grid, the off-diagonal non-zero elements appear inunpredictable locations. The linear systems are solved using parallelized conjugate gradients. The code is parallelized by domain decomposition of physical space into disjoint subdomains (SDS). Each processor receives its own SD plus a border of ghost cells. Results are presented on a problem coupling hydrodynamics to non-linear heat conduction.