Numerical Simulation Of Wave Overtopping Over Seawalls Based On FLUENT

Wave run-up and overtopping is an important norm. to measure the effectiveness and safety of a large dike and levee. However, while the wave reached the nearshore from the offshore, The interaction between waves and marine structures is a complex hydrodynamic processes. Type of dikes, water depth in front of seawalls, wave factor and so on has influence on wave run-up and overtopping. So, it's very important to estimate wave overtopping and reduce it in revetment design.Based on CFD software FLUENT, using VOF method and RNG turbulence k-epsilon mode, a kind of numerical wave tank is established. Then two kinds of wave-generating methods will be compared, they are source wave-generating method and push-pedal wave-generating method. We find source wave-generating method will be better when the wave steepness is bigger. The outgoing waves are dissipated by damping layers. By giving the porous resistance coefficient a linear increase with the x coordinate, we avoid wave reflection when the wave just gets into damping layers.A porous media source term is added to the momentum equation, then wave run-up and overtopping is simulated while the sea dikes are paved with armor blocks. Moreover, the relationship between porous resistance coefficient and roughness coefficient of armor block is given by simulating wave run-up. In order to verify the applicability of overtopping model, a variety of working condition is simulated. Then the results are compared with specification data. Comparisons show that numerical results agreed well with specification data. So, the model has a good enough accuracy and applicability.At last, wave overtopping is simulated when there are no armor blocks on the slopes, including two situations(have wave wall or not), then the results are compared with the physical model experiment and agreed well with it.