In this paper, a hybrid immersed smoothed point interpolation method (hybrid IS-PIM) is proposed, which employs a hybrid force approach to impose fluid-structure interaction (FSI) force condition. Compared with the original IS-PIM using a complete body force, the hybrid IS-PIM still utilizes the form of body force for pressure term to enhance the stability of numerical algorithm, and the shear force is applied to the boundary to accord with the physical law and the practical situation. Numerical examples have shown that the body force term enables the proposed method to overcome the constraint of mesh size ratio, and the boundary force term has a direct effect on the motion and deformation of solids, which yields more accurate results in comparison with the complete body force applied in the original IS-PIM. Moreover, the equivalence of FSI force in forms of body force and boundary force are also verified straightforwardly using a series of mesh combinations.

在本文中，提出了一种混合浸入式平滑点插值方法（混合 IS-PIM），该方法采用混合力方法来施加流固耦合 (FSI) 力条件。与原来使用完全体力的IS-PIM相比，混合IS-PIM仍然利用体力的形式作为压力项来增强数值算法的稳定性，在边界上施加剪力以符合物理法律和实际情况。数值算例表明，体力项使所提出的方法能够克服网格尺寸比的约束，边界力项对固体的运动和变形有直接影响，与完整体相比产生更准确的结果施加在原始 IS-PIM 中的力。而且，