Study On 2-D Numerical Wave Tank Based On The Software FLUENT

In the design of ocean engineering structures, to better calculate the wave load on marine structure and predict the structural responses under the extreme wave environment has become increasingly demanded. Development of high accuracy and yet efficient numerical wave flume to predict wave-structure interaction has been the fronter in ocean engineering.On the platform of FLUENT software, a numerical wave flume is developed in this study. Based on the potential theory, Pressure Implicit with Splitting of Operators(PISO), a segregated method is employed to solve to the problem. The Volume of Fluid (VOF) method is applied to solve nonlinear free surface. A source term is used inside the domain to generate waves, and outgoing waves are dissipated by damping layers. The symmetry boundary is assumed for the open boundary.The numerical wave flume developed in this study is capable to generate linear regular wave, stokes wave, solitary wave and irregular waves, and obtain very long stable wave field. The wave gradual reduces in the process of spread because of the viscous water. An empirical formula is fitted, which is a relation of wave amplitudes along the propagation distance with wave parameters. Two methods, namely source wave-generating method and push-pedal wave-generating method are used to generate linear regular wave, and the results show that the former is better. The second and third order stokes wave are simulated, and the results show good consistence with theoretical results. At last the solitary wave is also simulated.The numerical simulation of the nonlinear irregular two-dimensional wave is conducted by the TMA spectra method, and theoretical spectra is repeated by the numerical waves. This study lays the foundation for further studies on three-dimensional waves under extreme conditions and interactions between waves and structures.