【摘要】 采用 VOF法处理自由表面 ,达西源项法处理固 -液两相区流动 ,开发了铸造过程流动与传热耦合数值模拟软件。通过对流场及温度场分别采用不同的计算域和时间步长 ,大大提高了计算效率。利用该软件模拟了一薄壁板件的低压铸造过程 ,并进行了实验验证。数值模拟结果表明 ,对薄壁件而言 ,充型过程的流动对铸件初始温度分布影响较大 ,但充满后的残余流动对温度分布影响较小更多还原

【Abstract】 Using the VOF method to track the free surface and the Darcy source term approach to model the flow in mushy regions, we developed a 3 dimensional program for modeling the coupled fluid flow and heat transfer during casting processes. We adopted different time steps for the calculation of the flow and temperature field, which improve the efficiency greatly. With this program we modeled the low pressure casting process of a thin plate casting from the beginning of filling till the end of solidification. The simulation results were verified by experiment. The results indicate that the fluid flow during mould filling has great influence on the initial temperature profile, but the residual fluid flow after being filled has little influence on the temperature for thin wall castings.更多还原