Simulation of Fluid-Structure Interaction using an Incompressible Smoothed Particle Hydrodynamics

Numerical simulations of fluid-structure interactions in free surface flows were conducted by using an Incompressible smoothed particle hydrodynamics (ISPH) method. In the current ISPH algorithm, a stabilized incompressible SPH method by relaxing the density invariance condition is introduced as Asai et al. (2012). The governing equations are discretized and solved with respect to Lagrangian moving particles filled within the mesh-free computational domain and the pressure was evaluated by solving pressure Poisson equation using a semi-implicit algorithm based on the projection scheme to ensure divergence free velocity field and density invariance condition. In this study, the structure is taken as a rigid body and it modeled by ISPH method. We computed the motions of a rigid body by direct integration of fluid pressure at the position of each particle on the body surface. Then, the equations of translational and rotational motions were integrated in time to update the position of the rigid body at each time step. The applicability and efficiency of current ISPH method with the new treatment of rigid body are tested by comparison with reference experimental results.