Interaction between wave and coastal structure: Validation of two lagrangian numerical models with experimental results marine 2011

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Didier, E.
Martins, R.
Neves, M. G.
Vasco, J. R G [UNESP]

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Numerical modeling of the interaction among waves and coastal structures is a challenge due to the many nonlinear phenomena involved, such as, wave propagation, wave transformation with water depth, interaction among incident and reflected waves, run-up / run-down and wave overtopping. Numerical models based on Lagrangian formulation, like SPH (Smoothed Particle Hydrodynamics), allow simulating complex free surface flows. The validation of these numerical models is essential, but comparing numerical results with experimental data is not an easy task. In the present paper, two SPH numerical models, SPHysics LNEC and SPH UNESP, are validated comparing the numerical results of waves interacting with a vertical breakwater, with data obtained in physical model tests made in one of the LNEC's flume. To achieve this validation, the experimental set-up is determined to be compatible with the Characteristics of the numerical models. Therefore, the flume dimensions are exactly the same for numerical and physical model and incident wave characteristics are identical, which allows determining the accuracy of the numerical models, particularly regarding two complex phenomena: wave-breaking and impact loads on the breakwater. It is shown that partial renormalization, i.e. renormalization applied only for particles near the structure, seems to be a promising compromise and an original method that allows simultaneously propagating waves, without diffusion, and modeling accurately the pressure field near the structure.



Impact loads, Sph - Smoothed Particle Hydrodynamics, Vertical breakwater, Wave-structure interaction, Coastal structures, Experimental data, Experimental setup, Free-surface flow, Incident waves, Lagrangian, Lagrangian formulations, Non-linear phenomena, Numerical modeling, Numerical results, Physical model, Physical model test, Pressure field, Reflected waves, Renormalization, Smoothed particle hydrodynamics, Water depth, Wave overtoppings, Wave transformations, Wavebreaking, Breakwaters, Computational methods, Computer simulation, Hydrodynamics, Lagrange multipliers, Marine engineering, Numerical models, Underwater foundations, Wave transmission, Coastal engineering

Como citar

MARINE 2011 - Computational Methods in Marine Engineering IV, p. 134-145.