SC15 Austin, TX

Large-Scale and Massively Parallel Phase-Field Simulations of Pattern Formation in Ternary Eutectic Alloys

Authors: Johannes Hötzer (Karlsruhe University of Applied Sciences), Martin Bauer (FAU Erlangen Nuremberg), Marcus Jainta (Karlsruhe Institute of Technology), Philipp Steinmetz (Karlsruhe Institute of Technology), Marco Berghoff (Karlsruhe Institute of Technology), Florian Schornbaum (FAU Erlangen Nuremberg), Christian Godenschwager (FAU Erlangen Nuremberg), Harald Köstler (FAU Erlangen Nuremberg), Ulrich Rüde (FAU Erlangen Nuremberg), Britta Nestler (Karlsruhe Institute of Technology)

Best Poster Finalist

Abstract: Various patterns form during directional solidification of ternary eutectic alloys. These macroscopic patterns strongly influences the material properties. To study the influence of the material and process parameters for a wide range of ternary alloys during solidification, simulations are conducted to gain new insights. In this poster, we present the results of massive parallel phase-field simulations on up to 262144 cores, based on the HPC framework waLBerla. Results of optimization techniques are shown, starting from the model up to the code level, including buffering strategies and vectorization. The approach comprises systematic node level performance engineering and gains in a speedup of factor 80 compared to the original code. Excellent weak scaling results on the currently largest German supercomputers, SuperMUC, Hornet and Juqueen, are presented. Novel methods like principle component analysis and graph based approaches are applied to compare the computed microstructural patterns with experimental Al-Ag-Cu micrographs.

Poster: pdf
Two-page extended abstract: pdf

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