摘要
分别用结合壁面函数的层流模型和K-ε紊流模型，对重力及压力铸造条件下的型腔充填过程进行了数值模拟。结果表明：对于重力充填过程，结合壁面函数的层流模型可获得与结合壁面函数的紊流模型相似的结果，计算效率大大提高；但对压力条件下的充填过程，两种模型的计算结果有明显差别，紊流模型更接近实验结果。所以，对于重力充填过程，结合壁面函数层流模型可近似代替紊流模型进行模拟。
The nutnerical simulations of mold filling are carried out for gravity and pressure die casting process-es. The laminar assurnption and turbuIence model,both combining the wall function,are used to show the influence onthe calculated results. It is shown for the gravity condition that the Iarninar assumption can obtain a similar calcuIatedresult as using thte turbulence model,and that the computational time decreases very much. Furthermore,for the pres-sure die casting,the turbulence model shows better than the laminar assumption,and can get results agreeable with theexperimental ones. In order to save computational tirne,the laminar assumption can replace the turbulence model underthe gravity casting condition for the mold filling process.
出处
《热加工工艺》
CSCD
北大核心
1997年第5期11-14,共4页
Hot Working Technology
