海洋工程数值风-浪-流水池模拟及分析

Ocean engineering numerical simulation and analysis in the wind-wave-current pool

针对海洋工程中风-浪-流三者之间复杂的非线性相互作用,系统研究了风-浪-流相互作用机理。基于不可压缩Navier-Stokes方程,通过对FLUENT软件进行二次开发,构建了三维海洋工程数值风-浪-流水池。将数值水池模拟结果和理论值进行了对比,二者吻合较好,表明所建模型具有较高的精度;借助所建立的数值模型,成功模拟了波浪、波浪-海流以及海风-波浪-海流之间的相互耦合作用。研究结果表明,单独浪-流耦合作用时海流对于波浪运动参数具有较大影响,波流同向时,海流导致波浪传播速度和波长增大,幅值减小;波流逆向时,波浪传播速度和波长均减小,波幅增大,且海流速度越大,波浪参数增大或减小的幅度越明显。风-浪-流三者耦合作用时,风会导致波浪传播过程中波长增大,波幅减小,同时会导致波峰呈现一定倾角,加速波浪发生破碎。本文研究成果可为处于风-浪-流中的海洋工程结构物力学分析提供借鉴。

The wind-wave-current interaction mechanism was systematically studied for the complex nonlinear interaction between wind,wave and current in ocean engineering.Based on the incompressible Navier-Stokes equation,a three-dimensional ocean engineering numerical wind-wave-current pool was constructed by carrying out secondary development of FLUENT software.By comparison,the results of numerical pool simulation were in good agreement with the theoretical values,indicating that the model has high precision.By virtue of the established numerical model,the mutual coupling effects between wave,wave-current and wind-wave-current were successfully simulated.The results show that for single wave-current coupling effect,current has a great influence on the wave motion parameters.When the wave and current are in the same direction,the current leads to increased wave propagation velocity and wavelength and decreased amplitude.When the wave and current run in opposite directions,both the wave propagation velocity and the wavelength are decreased and the amplitude is increased;the greater the current velocity,the more obvious the increase or decrease of the wave parameters.When the wind-wave-current coupling effect occurs,the wind will lead to increase of wavelength and decrease of amplitude during wave propagation;meanwhile,it will cause the wave peak to exhibit a certain inclination,which accelerates the breakage of wave.The research results in this paper can provide references for the mechanical analysis of ocean engineering structures in wind-wave-current environments.