We studied collision between fluid surface and a rigid disk using smoothed particle hydrodynamics (SPH). A difficulty of the problem is the treatment of fluid boundary its condition largely varies with time. SPH is an effective method to solve such problems which involve time-dependent boundary condition. In our model, disk-fluid collision is characterized with four dimensionless parameters, which are Reynolds number, Froude number, angle of incident and ratio of disk density to fluid density. After the disk-fluid impact, disk will go down into fluid or rebound. We made a phase diagram for the two cases. Moreover, we present dynamics of repulsion and energy dissipation.
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