【摘要】 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．更多还原

【Abstract】 In a reference frame attached to the moving heat source, for example, surface remelting, a fixed grid eathalpy-porosity method was used to deal with phase change problem, and the momentum and energy changes caused by moving heat source were taken as additional sources to formulate control equations which are discretised and solved using control-volume-based compotational method. Heat transfer 9 phase change and fluid flow in melted pool could be simulated. With the developed software, the temperature and velocity fields of stainless steel for different laser input powers and same scanning velocity during laser remelting have been calculated and analysized.更多还原