[PO-F1] Poster Session 1

[P1-41] Multi-phase-field lattice Boltzmann modeling and simulation of equiaxed structure

^○Ryotaro Sato¹, Tomohiro Takaki¹, Shinji Sakane¹, Munekazu Ohno², Yasushi Shibuta³ (1.Kyoto Institute of Technology, Japan, 2.Hokkaido University, Japan, 3.Tokyo University, Japan)

Equiaxed structure formed during a solidification process of metals and alloys determines the mechanical property of materials. Therefore, it is crucial to accurately predict and control the formation process of the equiaxed structure. However, the formation process of equiaxed structure is a complicated multiphysics problem including a motion of multiple grains.

In this study, we construct a multi-phase-field-lattice Boltzmann model which can express the growth, motion, collision, and coalescence of multiple dendrites and following grain growth. In this model, the growth and motion of multiple dendrites are expressed by a multi-phase-field method and equations of motion, respectively, and the liquid flow is computed by lattice Boltzmann method. The collision and coalescence of multiple dendrites and/or grains are also modeled in a concept of diffuse interface. Moreover, the simulation is accelerated by employing the active parameter tracking and graphics processing unit. By using the developed method, the formation simulations of the equiaxed structure are demonstrated.