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为了提高薄壁、复杂铸件凝固过程数值模拟时的计算速度 ,将整个计算域分为砂型和铸件两个分区 ,用显式差分格式计算砂型中的温度场 ,用交替方向隐式迭代法计算铸件中的温度场 ;基于热焓法 ,采用源项线性化技术处理凝固潜热 ,以提高铸件温度场的收敛速度 ,采用变时间步长以提高铸件温度场的计算效率 .通过一个算例 ,证实本算法可提高薄壁铸件凝固过程数值模拟的计算效率 .
In order to improve the calculation speed of numerical simulation of solidification process of thin-wall and complex castings, the whole calculation domain is divided into two sections of sand mold and casting. The temperature field in sand mold is calculated by explicit difference format and the castings are calculated by the alternating direction implicit iterative method Based on the enthalpy method, the linearization of the source term is used to deal with the latent heat of solidification to improve the convergence rate of the temperature field of the casting, and the time-varying step is adopted to improve the calculation efficiency of the temperature field of the casting.Through an example, The algorithm can improve the computational efficiency of the numerical simulation of thin-walled casting solidification process.