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对有移动热源的表面重熔问题，在固定坐标系内，采用固定网格、焓－孔隙度法处理相变，并将移动热源引起的能量、 动量方程的变化作为附加源项构建控制方程组，使用控制容积积分法对其进行求解，数值模拟了激光扫描条件下熔池内传热、相交 及流体流动的情况；利用所开发的软件对同一扫描速度、不同激光输入功率条件下不锈钢材料熔化与凝固过程中温度场、速度场进 行了比较与分析．
In the case of surface remelting with moving heat sources, fixed-grid and enthalpy-porosity methods are used to deal with the phase transformation in a fixed coordinate system, and the changes of energy and momentum caused by moving heat sources are taken as additional source terms to construct the control equations , Which is solved by the control volume integral method. The heat transfer, intersection and fluid flow in the molten pool under the condition of laser scanning are numerically simulated. By using the developed software, the melting conditions of the stainless steel with the same scanning speed and different laser input power Solidification process temperature and velocity fields were compared and analyzed.