Abstract
The multiplicity of renewable energy sources represents the biggest challenge for environmental scientists and engineers. This research presents a mathematical model and a numerical study using the high-performance ANSYS-CFX software to analyze the dynamic behavior of the point absorber wave energy converter (PAWEC). Two different models were constructed to predict the hydrodynamic response of the wave energy converter in both free and forced oscillations under the action of incident regular waves and external mechanical damping. The differential equations are solved analytically using RKFOM. CFX multiphase model is constructed to solve the 3D Unsteady Reynolds Averaged Navier–Stokes Equation (URANS) using the two-way Fluid–Structure Interaction (FSI) technique. The regular waves were generated in a numerical wave tank, by using a flap-type wavemaker. Mesh densities and solver settings were performed. The numerical results in both models, CFD and RKFOM, are validated against published experimental and numerical data under the same conditions, and the numerical results agreed with both published data. Two additional designs for the body bottom, conical and spherical shapes, were analyzed based on the presented numerical method. The damping coefficient and added mass are obtained for each design in the case of heave motion only.
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