[SY-F5] Symposium F-5

[SY-F5] Solidification microstructure formation by phase-field simulation with multi-GPU acceleration

Invited

^○Tomohiro Takaki¹, Shinji Sakane¹, Munekazu Ohno², Yasushi Shibuta³, Takayuki Aoki⁴ (1.Kyoto Institute of Technology, Japan, 2.Hokkaido University, Japan, 3.The University of Tokyo, Japan, 4.Tokyo Institute of Technology, Japan)

Accurate prediction of material microstructures is crucial for the production and design of high performance material. Phase-field method has emerged as a powerful numerical model for predicting the formation process of complicated material microstructure. Now, it is well accepted as the most accurate and promising model for microstructure formation in the mesoscale. On the other hand, a large computational cost due to the diffuse interface is a major drawback, and usually the phase-field simulation is limited to the small domain. To overcome this drawback, we need a high-performance computing for the phase-field simulation.

In this talk, we introduce our recent progresses in the high-performance phase-field simulation using multi-GPU acceleration. Here, we focus on the dendritic solidification where the microstructure is formed through the competitive growth among multiple dendrites. We introduce the phase-field simulations of dendrite competitive growth during directional solidification of a binary alloy in single crystal [1], bicrystal [2], and polycrystal [3]. In addition, the liquid flow drastically changes the solidification microstructure. We also introduce the large-scale phase-field simulations of dendrite growth with liquid flow [4-6]. The above all simulations have been performed by the GPU supercomputer TSUBAME at the Tokyo Institute of Technology.

[1] T. Takaki, S. Sakane, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki, Acta Materialia 118 (2016) 230-243.
[2] T. Takaki, S. Sakane, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki, ISIJ Int. 56(8) (2016) 1427-1435.
[3] T. Takaki, M. Ohno, Y. Shibuta, S. Sakane, T. Shimokawabe, T. Aoki, J. Crystal Growth 442 (2016) 14-24.
[4] S. Sakane, T. Takaki, R. Rojas, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki, J. Crystal Growth 474 (2017) 154-159.
[5] T. Takaki, R. Rojas, S. Sakane, M. Ohno, Y. Shibuta, T. Shimokawabe, T. Aoki, J. Crystal Growth 474 (2017) 146-153.
[6] T. Takaki, R. Sato, R. Rojas, M. Ohno, Y. Shibuta, Comp. Mater. Sci. 147 (2018) 124-131.