Improved Solver Settings for 3D Exploding Wire Simulations in ALEGRA

Report No. ARL-TR-7748
Authors: Robert Doney; Chris Siefert; John Niederhaus
Date/Pages: August 2016; 24 pages
Abstract: We are interested in simulating a variety of problems in 3 dimensions featuring large electric currents using the Sandia National Laboratories multiphysics code, ALEGRA. However, many such simulations were prohibitively slow due in part to unoptimized (matrix) solver settings. In this report, we address that by varying 6 parameters in the algebraic multigrid preconditioner,Trilinos/ML, as implemented in ALEGRA. Three parameters impacted performance with one dominating. We provide insight to solver behavior as well as recommended values.
Distribution: Approved for public release
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Last Update / Reviewed: August 1, 2016