用改进的 SOLA-VOF 法模拟铸造充型过程

Numerical simulation of mold filling of casting with an improved SOLA VOF method

铸造充型过程对铸件质量的影响很大，文中对流体充型过程的数值模拟做了研究。以ＳＯＬＡ－ＶＯＦ法为基础提出了改进算法。在三维自由表面处理上，提出一种简单而实用的方法，对原算法的累积流量误差做了修正，方程求解改用预处理共轭梯度法，保证了解的收敛性。为了模拟紊流现象，引入了Ｋ－ε双方程模型，用实验验证这些改进的效果，又用国际会议的标准检验实验进行了验证，着重于紊流现象的分析，模拟结果与验证实验吻合较好。

Mold filling processes are very important for the quality of castings. The authors have studied the numerical simulation of fluid flow during mold filling process. Based on SOLA VOF, an improved algorithm is presented. A simple but practical method is put forward to treat 3 D free surface. Modification is made to reduce flux deviation and PCGM technique is used to solve equations in order to guarantee the convergence of solution. K ε model is employed to simulate turbulent flow during mold filling. Based on self designed experiments, the authors use a benchmark test from an international conference to verify the modifications. Turbulent flow is paid special attention. The calculation result coincides well with the experimental.