Numerical Simulation of Nonlinear Regular and Irregular Waves Based on HOS-CFD Method

Abstract

Abstract In naval architecture and ocean engineering, efficient and accurate generation and propagation of nonlinear waves is an important problem to be solved. Due to the use of pseudo-spectral method and fast Fourier transforms (FFTs), High-Order Spectrum (HOS) is an efficient and stable potential flow theory model for simulating nonlinear waves. However, the HOS method cannot consider the effect of viscosity, which makes it difficult to solve the interaction problem between wave and structure. Meanwhile, the CFD method consumes a lot of computational time and resources to solve a large viscous wave field. Therefore, this paper intends to build a HOS and CFD coupling calculation model: The regular and irregular wave fields generated by the HOS method are reconstructed and interpolated, and then the nonlinear wave field information is transmitted to the computational domain from the boundary velocity inlet of the in-house viscous solver HUST-SHIP. The influence of mesh size on coupling is discussed, and the accuracy of the coupling method is validated by simulating various types of waves. The generation of nonlinear wave field and the coupling with viscous flow solver are obtained, which lays a solid foundation for the subsequent analysis of the interaction between nonlinear waves and ships and marine structures.