High Performance Computing Welding Analysis with DynaWeld and Parallelized LS-DYNA Solvers

In this paper the results of the PRACE SHAPE project “HPCWelding” are presented. During this project, a welding structure analysis with the parallel solvers of the LS-DYNA code was performed by Ingenieurbüro Tobias Loose on the Cray XC40 “HazelHen” at the High Performance Computing Center (HLRS) in Stuttgart. A variety of test cases relevant for industrial applications has been set up with DynaWeld, a welding and heat treatment pre-processor for LS-DYNA, and run on different numbers of compute cores. The results show that the implicit thermal and mechanical solver scales up to only 48 cores depending on the particular test case due to unbalanced workload. The explicit mechanical solver was tested up to 4080 cores with significant scaling. As we know, it was the first time that a welding simulation with the LS-DYNA explicit solver was performed on 4080 cores.