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本文将铸件以外的一切影响因素视为一种假想的特殊介质,结合生产实际获得了三种砂型冷却条件下的两种动态边界条件,在求解区域只包括铸件的计算凝固温度场的算法中,所给动态边界条件的准确性决定着该种算法的成败,而动态边界条件的通用性则决定着该种算法的应用前景。笔者在提出上述两种动态边界条件的基础上,又提出模数修正法,使得两种动态边界条件在铸件形状不同的条件下通用,且修正后计算误差最大不超过0.27%。而且使用该动态边界条件进行数值模拟,与传统的摸拟方法相比,可节省计算机内存和机时60—80%。
In this paper, we consider all factors except castings as an imaginary special medium. Combining with the actual production, we obtain two kinds of dynamic boundary conditions under three kinds of sand cooling conditions. Among the algorithms that only include the calculated solidification temperature field of casting, The accuracy of the given dynamic boundary conditions determines the success or failure of the algorithm, while the generality of the dynamic boundary conditions determines the application prospect of the algorithm. Based on the above two kinds of dynamic boundary conditions, the author also proposed the modulus correction method, which makes the two kinds of dynamic boundary conditions common under the different shape of the casting, and the calculated error after correction is no more than 0.27%. And using this dynamic boundary condition for numerical simulation, compared with the traditional simulation method, can save computer memory and machine time 60-80%.