CFD Simulation and Validation of Flap Type Wave-Maker

A general purpose viscous flow solver Ansys CFX was used to solve the unsteady three-dimensional (3D) Reynolds Averaged Navier-Stokes Equation (RANSE) for simulating a 3D numerical viscous wave tank. A flap-type wave generator was incorporated in the computational domain to generate the desired incident waves. Authors have made effort to study the physical behaviors of Flap type wave maker with governing parameters. Dependency of the water fill depth, Time period of oscillations and amplitude of oscillations of flap were studied. Effort has been made to establish relations between parameters. A validation study was also carried out against CFD methodology with wave maker theory. It has been observed that CFD results are in good agreement with theoretical results. Beaches of different slopes were introduced to damp the wave, so that it should not cause any reflection from boundary. As a conclusion this methodology can simulate the experimental wave-maker for regular wave generation for different wave length and amplitudes. Keywords—CFD, RANSE, Flap type, wave-maker, VOF, seakeeping, numerical method. NOMENCLATURE Af = flap stroke length Aw = wave amplitude H = wave height hf = Height of stationary wall below flap hw = water height S= stroke length Tp = Time period Ө = rotation angle of flap Xdisp = displacement of flap at z Pi = point location for wave elevation SUBSCRIPTS f = flap w = wave p = period of flap movement