Author(s): Daniel B. Bung, Mario Oertel
Keywords: Wave breaking; Numerical modeling; Experimental modeling; Computer Vision; Optical Flow;
Abstract: Wave breaking is a complex phenomenon which typically involves strong air entrainment and turbulence. When taking place at the shoreline, wave breaking may cause severe erosion and beach deformation. Wave breakers may be considered to force offshore breaking. It was shown in several earlier studies that a submerged horizontal plate may serve as such wave breaker. Waves propagating over the plate are transformed to shallow water waves and breaking takes place over the plate.
In the present study, this process is modeled numerically by 3D LES and RANS (with RNG k- turbulence closure) CFD simulations using the commercial software FLOW-3D®. The performance of both methods is compared to each other and to new laboratory data. Optical Flow and surface detection methods are employed in the experimental model, using high-speed recordings with HD resolution. The paper aims to provide a performance evaluation of different numerical simulation methods and visual laboratory measurement techniques.