Peta-scale phase-field simulation for dendritic solidification on the TSUBAME 2.0 supercomputer

Authors:
Takashi Shimokawabe;Takayuki Aoki;Tomohiro Takaki;Toshio Endo;Akinori Yamanaka;Naoya Maruyama;Akira Nukada;Satoshi Matsuoka
Affiliations:
Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo, Japan;Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan and Japan Science and Technology Agency, CREST;Kyoto Institute of Technology, Gosyokaido-cyo, Matsugasaki, Sakyo-ku, Kyoto, Japan;Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan and Japan Science and Technology Agency, CREST;Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan;Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan and Japan Science and Technology Agency, CREST;Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan and Japan Science and Technology Agency, CREST;Tokyo Institute of Technology, Meguro-ku, Tokyo, Japan and Japan Science and Technology Agency, CREST and National Institute of Informatics
Venue:
Proceedings of 2011 International Conference for High Performance Computing, Networking, Storage and Analysis
Year:
2011

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Abstract

The mechanical properties of metal materials largely depend on their intrinsic internal microstructures. To develop engineering materials with the expected properties, predicting patterns in solidified metals would be indispensable. The phase-field simulation is the most powerful method known to simulate the micro-scale dendritic growth during solidification in a binary alloy. To evaluate the realistic description of solidification, however, phase-field simulation requires computing a large number of complex nonlinear terms over a fine-grained grid. Due to such heavy computational demand, previous work on simulating three-dimensional solidification with phase-field methods was successful only in describing simple shapes. Our new simulation techniques achieved scales unprecedentedly large, sufficient for handling complex dendritic structures required in material science. Our simulations on the GPU-rich TSUBAME 2.0 supercomputer at the Tokyo Institute of Technology have demonstrated good weak scaling and achieved 1.017 PFlops in single precision for our largest configuration, using 4,000 GPUs along with 16,000 CPU cores.