中文摘要：

本文将固液界面熔融区作为多孔介质处理，通过引入液相分数标量，建立流体区和固体区统一的控制方程，实现流体与固体区域耦合求解以及熔化过程和凝固过程的同时求解．以 ＡＩＳＩ ３０４不锈钢材料激光加工过程为例，详细分析比较热传导、Ｍａｒａｎｇｏｎｉ和热浮力三种不同的换热机理对溶池形状和溶池内流动的影响。

英文摘要：

The article illustrates characteristics of melting and solidification processes in fixed meshes, from unified Continuity Equations, Momentum Equations and Energy Equations for both liquid and solid phases by introducing scalar of liquid fraction and applying source-based method. The model was applied to laser processing of AISI 304 stainless steel. The effects of heat conduction, Marangoni flow and thermal buoyancy on melting process and shape of molten pool were analyzed and physical fundamentals of laser ...