Simulation of Liquid Flow Permeability for Dendritic Structures during Solidification Process

Abstract

The article presents a numerical model for detn. of liq. flow permeability through dendritic solid phases during growth. The model includes three stages; first, numerical simulation of nucleation and growth of the equiaxed grains using a novel Cellular Automation Finite Difference (CAFD) method, and second, numerical simulation of micro fluid flow for interdendritic liq. alloys using Computational Fluid Dynamics (CFD) technique, and third, calcn. of permeability based on Darcy's law by the pressure and velocity results of CFD code. Finally detg. and modeling the permeability variations vs. the cooling rate and the solidification rate during growth. This model can be linked as a module into a com. macro fluid flow code in order to predict the micro-defects such as the micro porosities, shrinkages or micro-segregations. [on SciFinder(R)]