A two-dimensional high precision physical wave generation method based on structured dynamic mesh

This paper introduces a structured dynamic grid method and proposes a physics-based rocker-flap wave-making approach. It establishes a nonlinear mapping relationship between the slider and the wave-making plate and a linear mapping relationship between the moving grid and the initial grid. The computational area is divided into three sections: the wave-making area, propagation area, and offshore dike area (or wave dissipation area). The other areas are modeled with one of four turbulence models, with the exception of the propagation area, where the laminar model is applied. This hybrid numerical simulation model can accurately reproduce the wave formation, propagation, and interaction between waves and structures. The physical experiments and numerical simulations are carried out using three sets of two-dimensional models: a pure wave flume, grooved embankment, and smooth embankment. The results of the physical experiments validate the reliability of the proposed hybrid model approach. The most accurate results are obtained when the turbulent region is modeled with the k-ω SAS model. Furthermore, the study identifies vortex patterns using Rortex vortex identification. It is observed that the wave-making and propagation processes of short waves exhibit typical wave-vortex mixing turbulence characteristics characterized by large-scale fluctuations and small-scale wave surface vortex strings. • A mathematical model for flap-type wave generation is proposed. • A zonal hybrid method with dynamic mesh is proposed for solving 2D wave problems. • The k-ω SAS model is the preferred choice for the zonal hybrid simulation method. • The simulation accurately replicates the physical processes observed in the experiment. • Wave-vortex mixing turbulence features large-scale fluctuations and small-scale vortex strings in short waves.