Fluid-Rigid Body Simulation for Seawall Block Collapse using Moving Particle Hydrodynamics (MPH)
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When seawalls collapse due to high waves, horizontal forces are generated by the difference in water levels between the front and back sides of the blocks [1]. If the seawall is under construction, the stones are packed behind it. It is known that the backfill stones influence the force to the blocks. To estimate damage to seawalls under construction by high waves, numerical analysis is one of the effective approaches along with experimentation. To analyze this phenomenon numerically, a fluid-structure interaction simulation was performed for the collapse of seawall blocks under construction when exposed to high waves. The particle method was adopted for the simulation, as it effectively handles large-scale fluid and rigid body motions. Moving Particle Hydrodynamics (MPH) [2], a physically consistent particle method, was applied to accurately simulate the interactions between the blocks, backfill stones, and water. The study also examined modeling techniques for representing rigid bodies. The simulation results were compared with experimental data. REFERENCES [1] Arikawa, T., Sato, M., Shimosako, K., Hasegawa, I., Yeom, G-S., & Tomita, T., “Failure Mechanism of Kamaishi Breakwaters due to the Great East Japan Earthquake Tsunami”, Coastal Engineering Proceedings, Coastal Eng. (2012). [2] Kondo, M., “A Physically Consistent Particle Method for Incompressible Fluid Flow Calculation”, Computational Particle Mechanics, 8, 69-86 (2021).