Keywords: fluid-structure interaction, reflective boundary conditions, meshfree particle method, SPH, dynamic boundary conditions.

The replacement of artificial computational techniques by the physical reflective boundary conditions (RBC) - according to the physical laws in the continuum domain - is a relevant advance in the current scientific community search for a realistic treatment of the interaction between the fluid and the solid boundaries in meshfree particle methods. In most particle simulations of fluid-structure interaction (FSI) problems employing meshfree Lagrangian particle methods, artificial boundary conditions (ghost and dummy particles, dynamic boundary conditions, among others) are used, despite confronting the continuum laws. In this work, the implementation of RBC in the Smoothed Particle Hydrodynamics (SPH) simulation of the benchmark problem of a wave impacting a tall structure - a rigid obstacle fixed inside a reservoir – is presented. The numerical results obtained have been compared to literature results and both are in good agreement. The water wave generated due to the dam break over the dry bed reached the rigid obstacle approximately at the instant of time 0.30 s. The good applicability of RBC coupled with the SPH meshfree particle method encourages the implementation and testing of RBC to solve FSI problems involving fixed rigid boundaries.

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