Numerical analysis of fluid flow and heat transfer in melted pool with a moving heat source

In a reference frame attached to the moving heat source, for example, surface remelting, a fixed grid enthalpy-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 discretized and solved using control-volume-based computational method. Heat transfer, 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.