CFD (Computational Fluid Dynamics) technology is widely used in ship, port and ocean engineering field. The numerical wave tank based on CFD can avoid the error in the actual experiment, and has the advantages of low cost, high flexibility, etc., compared with the physical wave tank. Stable and accurate simulation of nonlinear waves (approximate real sea conditions) in numerical wave tanks is the primary task of related research. In this paper, a 3D numerical wave tank is established based on ANSYS FLUENT, and the convergence analysis of the tank is carried out for the simulation of nonlinear waves. By exploring and analyzing the factors affecting the accuracy of numerical wave simulation such as grid division and time step, the appropriate numerical simulation method is obtained under the premise of ensuring the computational efficiency. This method can provide guidance for related nonlinear wave numerical tank simulation research.

1. Introduction

Many important issues involved in ocean engineering are related to waves. As the main load considered in ship and ocean engineering, waves have always been the difficulty of research. Therefore, studying the law of wave motion has important significance. Physical wave tanks have always been an important tool for studying the effects of waves and ocean structures, but their high cost and serious scale effects have restricted their use.

With the development of computer performance, using computers as tools to simulate fluid flow with numerical methods has gradually become more and more important. The use of computers to develop numerical wave tanks to study the interaction between waves and structures has gradually become one of the mainstream research directions. Among them, the boundary element method based on the potential flow theory is widely used in the interaction of waves and ocean structures, but the potential flow method ignores the influence of fluid viscosity. Therefore, most of the numerical wave tanks at this stage are based on the theory of viscous flow, considering the impact of the viscous flow effect, to better simulate the law of wave motion under actual conditions.

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