Extreme wave propagation by coupling two computational models: SWASH Model and DualSPHysics Model

In this work, a new physical approach has been implemented to generate various scenarios of extreme waves by coupling two computational models, Simulating WAve till Shore (SWASH) and DualSPHysics Models, with different computational costs. Both models have been largely used for investigating the hydrodynamics in nearshore and coastal zones. The SWASH model is deterministic wave model based on the nonlinear shallow water equations, with added non-hydrostatic effects is an effective model for propagating waves in extended areas, while the DualSPHysics model is a meshless Lagrangian model based on the smoothed particle hydrodynamics method, developed to study free-surface flows is useful to investigate analysis of the interaction between waves and coastal structures. The SWASH-SPH coupling technique utilizes experimental water surface elevation data as input to SWASH. The SWASH model employs a multi-layer approach to obtain velocity distributions over time, and at the coupling point, the resulting velocity data from SWASH is utilized for the coupling point. Waves in DualSPHysics are generated by a moving boundary (MB), whose displacement over time is reconstructed using velocities provided by SWASH.  The numerical coupling of both models has been validated using experimental data, useful to extend its application to more complex systems and/or those not achievable through physical experiments. In addition, this approach opens up interesting prospects for advanced modeling and numerical simulations in a variety of environments, such as dam failure, waves breaking and sediment transport on beaches. The coupled SWASH-SPH model reproduces the propagation and breaking of extreme waves. SWASH captures wave transformation offshore, while SPH effectively resolves the complex dynamics in the breaking zone. Overall, the SWASH-SPH method successfully quantitatively reproduces the expected behavior in these test cases.

 

Keywords: Extreme Wave, Wave propagation, SWASH Model, DualSPHysics Model.