Coupling of SPH with smoothed point interpolation method for violent fluid-structure interaction problems

A two dimensional fluid-structure interaction (FSI) model has been proposed by coupling SPH with smoothed point interpolation method (S-PIM). SPH is a Lagrangian particle method, which has been frequently used to simulate the incompressible viscous fluid with free surface flow. The newly developed S-PIM has been used to deal with motion and deformation of nonlinear solids. And the softened model stiffness in S-PIM enhances the performance of mesh distortion insensitivity for large deformation. The coupled SPH with S-PIM has been achieved by introducing the ghost particles, which can prevent the fluid particles penetrating into the interface and construct intact support domain for particles around the interface. Numerical examples have validated the reliability and efficiency of the proposed method for FSI problems.