SCHEDULE: NOV 15-20, 2015

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Massively Parallel Phase-Field Simulations for Ternary Eutectic Directional Solidification

SESSION: Applications: Material Science

EVENT TYPE: Papers, Best Paper Finalists

EVENT TAG(S): Applications

TIME: 10:30AM - 11:00AM

SESSION CHAIR(S): Suzanne Shontz

AUTHOR(S):Martin Bauer, Johannes Hötzer, Marcus Jainta, Philipp Steinmetz, Marco Berghoff, Florian Schornbaum, Christian Godenschwager, Harald Köstler, Britta Nestler, Ulrich Rüde

ROOM:18AB

ABSTRACT:

Microstructures forming during ternary eutectic directional solidification processes have significant influence on the macroscopic mechanical properties of metal alloys.
For a realistic simulation, we use the well established thermodynamically consistent phase-field method and improve it with a new grand potential formulation to couple the concentration evolution.
This extension is very compute intensive due to a temperature dependent diffusive concentration.
We significantly extend previous simulations that have used simpler phase-field models or were performed on smaller domain sizes.
The new method has been implemented within the massively parallel HPC framework waLBerla that is designed to exploit current supercomputers efficiently.
We apply various optimization techniques, including buffering techniques, explicit SIMD kernel vectorization, and communication hiding.
Simulations utilizing up to 262,144 cores have been run on three different supercomputing architectures and weak scalability results are shown.
Additionally, a hierarchical, mesh-based data reduction strategy is developed to keep the I/O problem manageable at scale.

Chair/Author Details:

Suzanne Shontz (Chair) - University of Kansas|

Martin Bauer - FAU Erlangen Nuremberg

Johannes Hötzer - Karlsruhe University of Applied Sciences

Marcus Jainta - Karlsruhe University of Applied Sciences

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

Britta Nestler - Karlsruhe Institute of Technology

Ulrich Rüde - FAU Erlangen Nuremberg