Abstract
This paper describes a method for the coupled analysis between incompressible smoothed particle hydrodynamics (ISPH) and multibody dynamics (MBD). ISPH is a numerical technique used to calculate the motion of a fluid that is expressed as a system of particles. The analysis program for SPH-MBD coupled analysis is developed. The fluid force acting on a body should be calculated to solve the coupled problem. The method for fluid-body interaction at an acceleration level is proposed. The fluid force is considered as the external force and moment for a body. The motion of a body due to the fluid force and other forces is calculated by an implicit HHT-α integration technique in MBD. A pendulum model is used to verify the accuracy of the analysis program. An experimental setup is designed using a dimensional water tank. Four wave conditions are used. The wave height and the pendulum motion of a buoy are compared with experimental results. Simulation results reveal that period and wave height are consistent with experimental findings, and the pendulum motion of a buoy shows a maximum error of 12.2 %.
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