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Numerical study of dynamics of hollow square under plunging wave action using a modified WCSPH-MSDEM coupling method
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DOI：10.1016/j.jfluidstructs.2026.104597.png)
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Abstract
En 中文
This work presents a numerical study on the dynamic behavior of a hollow square placed on a slope subject to plunging waves. The investigation employs a mesh-less model that couples the Weakly-Compressible Smoothed Particle Hydrodynamics (WCSPH) with a modified Multi-Sphere Discrete Element Method (MSDEM). A novel Bottom Pressure Integration (BPI) algorithm is introduced into the model to enhance the accuracy of the hydrodynamic force evaluation, particularly the buoyancy acting on a block partially in contact with solid boundaries. The capability of the WCSPH model to simulate violent free-surface flows, together with the effectiveness of the BPI algorithm in accurately simulating the buoyancy on a block, are thoroughly validated through test cases. After further validation against laboratory experiments of a hollow block sliding under regular waves, the model is then applied to explore complex motion behaviors of the block which include sliding, jumping, and rolling triggered by wave run-up, run-down, and the impact of plunging jets. Additionally, a quantitative analysis of the effects of both tangential action and time-varying buoyancy on block motion is provided.
Keywords:
Armor block instability
WCSPH-MSDEM model
BPI algorithm
Wave-induced block dynamics
Buoyancy
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