Coupling Simulations of Growth and Motion of Dendrite by Phase-field Lattice Boltzmann Method

Abstract:

Typical solidification microstructures consist of equiaxed and columnar structures. During solidification, convection of liquid plays a crucial role on both solidification structures. Here, the growth direction of columnar structures is changed by the convection [1], and free dendrites flowing within the melt form the equiaxed structures [2]. Due to some computational advantages over other numerical techniques, the phase-field method (PFM) has emerged as the most powerful numerical tool to simulate dendritic solidification [3]. The PFM has been also applied to dendritic growth in fluid flow [4]. However, almost all simulations have been carried out for fixed dendrites in fluid flow, and only few phase-field studies have been done for moving dendrites [5]. Recently, we have developed a phase-field lattice Boltzmann method (PFLBM) which can simultaneously simulate dendritic growth, and translation and rotation of the solid phase in fluid flow [6].

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