Phase-field simulation of alloy dendritic growth based on LBM algorithm in force flow
Phase-field simulation of alloy dendritic growth based on LBM algorithm in force flow
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发表时间：
2014
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通讯作者：
Wang Zhi-pin
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作者：
Wang Zhi-pin
The Lattice Boltzmann Method(LBM)was coupled with a phase-field model to simulate dendrite growth of Al-4.5%Cu(mass percent)binary alloy with fluid flow during solidification,thereby,phase field-LBM model(PF-LBM)was established to simulate the dendritic growth of undercooled melt in a forced laminar flow state.The results show that the model have high computational efficiency and good numerical stability in simulating dendritic growth by combining the LBM.The dendrite shapes are symmetrical when the pure solute diffused,the dendrites evenly distribute around the solute,and the dendrite tip growth rate is the same.However,the melt flow change solute distribution around the dendrite when the situation is with forced convection,the solute is washed from upstream to downstream,resulting an large components undercooling in the upstream and an small undercooling in the downstream,as a result,the growth velocity of upstream dendritic tip is higher than that when the pure solute diffuse,but the downstream dendritic tip is inhibited and the dendrite shapes are unsymmetrical as same as that when the pure solute diffuse.
