A ghost-node immersed smoothed point interpolation method (ghost-node-ISPIM) for fluid-structure interaction problems

Immersed smoothed point interpolation method (IS-PIM) was successfully proposed for solving fluid-structure interaction (FSI) problems with large solid deformations. However, the defects of IS-PIM include inaccurate solid boundary, spurious pressure oscillation and the “fresh node” phenomenon, which will cause different degrees of numerical errors. In order to solve these problems, the ghost-node immersed smoothed point interpolation method (Ghost-node-ISPIM) has been presented in this paper. In this method, the ghost-node technique is firstly proposed and achieved based on unstructured triangular elements, combined with mass source/sink algorithm and the sharp-interface method to fix the inherent defects existed in original IS-PIM. The effectiveness and superiority of the Ghost-node-ISPIM are demonstrated by a series of typical FSI numerical examples. • A ghost-node technique is firstly proposed based on triangular elements. • The mass source/sink algorithm is introduced to prevent pressure oscillations. • The sharp-interface method is employed to solve the "fresh nodes" problem. • The proposed method exhibits good performance for fluid-structure interactions.