An improved moving particle semi-implicit (MPS) method was developed to solve water entry problems. The traditional mixed source term was modified based on a prediction-correction scheme to suppress pressure oscillations. An improved free surface identification method was implemented for fluid computations. A weak coupling method was adopted for fluid-structure interaction. The structures were modeled by isotropic linear elastic particles. The application of the source term correction method leads to a better pressure prediction and therefore a more accurate interaction between the fluid and the structure. Validation studies were carried out for water entry of two rigid wedges, a rigid ship section, and a flexible wedge. The results by the present MPS method are in good agreement with experimental data and other published numerical results.

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