建立了模具充型过程的光滑粒子流体动力学方法数值模型。为了表征模具固壁对充型流体的约束,建立了一种耦合固壁边界条件。在固壁表面设置了L-S斥力粒子;在固壁内部设置了若干层边界虚粒子,实现对流体粒子支持域的补充。通过冷态水模拟实验对计算模型进行了验证。计算结果与实验吻合良好,证明了本文模型的有效性。 A numerical model of smooth particle hydrodynamics for mold filling is established. In order to characterize the constraint of the mold wall on the filling fluid, a coupled solid wall boundary condition is established. L-S repulsion particles are arranged on the surface of the solid wall; several layers of boundary virtual particles are arranged inside the solid wall so as to supplement the fluid particle supportive field. The calculation model is verified by cold water simulation. The calculated results are in good agreement with the experimental results, which proves the validity of the proposed model.