Abstract
This paper presents a developed new coupled method which combined our in-house CFD solver naoe-FOAM-SJTU and naoe-FOAM-os with a potential theory High Order Spectral method (HOS). A parametric study of nonlinear wave propagation in computational fluid dynamics (CFD) zone is considered. Mesh convergence, time step convergence, time discretization scheme and length of relaxation zone are all carried out. Those parametric studies verify the steady of this new combined method and give better choice for wave propagation. The dissipation in propagation of nonlinear regular wave can be lower than 3% in static mesh, and less than 2% in overset grid mesh. Meanwhile, a LNG FPSO is put into the viscous wave tank to study the suitable size of CFD zone. To achieve a better solution with least calculating resources and best numerical results, the length of CFD zone is discussed. These parametric studies can give reference upon employment of the potential-viscous coupled method and validation of the coupled method.
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