2D multi-phase-field lattice Boltzmann simulations of semi-solid shear deformation

Abstract

The deformation of solid–liquid coexistence regions strongly affects the formation of solidification defects in casting applications. Thus, understanding the mechanism of semi-solid deformation is crucial. This study used the multi-phase-field lattice Boltzmann model (MPF-LBM), which can simulate polycrystalline solidification with solid motion and liquid flow, to simulate two-dimensional semi-solid shear deformation with various grain shapes and solid fractions. It was concluded that the MPF-LBM could express the characteristic behaviors of semi-solid deformation, such as the Reynolds’ dilatancy and shear band, depending on the grain shape and solid fraction.

Multi-phase-field lattice Boltzmann simulations of semi-solid simple shear deformation in thin film

“…Our group replicated polycrystalline solidification, using a model IOP Publishing doi:10.1088/1742-6596/2766/1/012195 2 coupled with the multi-phase-field (MPF) and LB methods, thereby applying the MPF-LB model to semi-solid deformation [14]. Although the MPF-LB model successfully describes the continuous process from polycrystalline solidification to semi-solid deformation [14][15][16], the aforementioned simulations were limited to 2D. However, the fluid flow occurs three-dimensionally avoiding grains, therefore 3D simulations are essential for better understanding of the semi-solid deformation.…”