Abstract：Free surface flows impacting elastic structure are common problems, usually referring to interface track, elastic or plastic deformation and fluid-structure interaction. To simulate these problems, it has to capture the deformation of interfacial flow and compute the fluid structure coupling interaction accurately. In this paper, a SPH uniform method where both fluid and solid phases are described by smoothing particle hydrodynamics is present, solving uniform continuous medium governing equations and weekly pressure state equation. A new contact algorithm with the structure surface particles being treated as virtual particles is developed. The virtual particles would be defined in initial particle configuration, contain both of fluid and structure particle characters and produce repulsive force to prevent the penetration. Compared numerical results with experiments, it is demonstrated that the SPH uniform method with the new contact algorithm can be used to simulate free surface impacting elastic structure problems easily and accurately.
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