FE~2TI: Computational Scale Bridging for Dual-Phase Steels

摘要

A scale bridging approach combining the FE~2 method with parallel domain decomposition (FE~2TI) is presented. The FE~2TI approach is used in the project "EXASTEEL - Bridging Scales for Multiphase Steels" (within the German priority program "Software for Exascale Computing - SPPEXA") for the simulation of modern dual-phase steels. This approach incorporates phenomena on the microscale into the macroscopic problem by solving many independent microscopic problems on representative volume elements (RVEs). The results on the RVEs replace a phenomenological material law on the macroscale. In order to bring large micro-macro simulations to modern supercomputers, in the FE~2TI approach a highly scalable implementation of the inexact reduced FETI-DP (Finite Element Tearing and Interconnecting - Dual Primal) domain decomposition method (scalable up to 786432 Mira BlueGene/Q cores) is used as a solver on the RVEs. Weak scalability results for the FE~2TI method are presented, filling the complete JUQUEEN at JSC Jiilich (458 752 cores) and the complete Mira at Argonne National Laboratory (786 432 cores).