基于边界造波法的二阶Stokes波的数值生成

Numerical simulation of second-order Stokes based on wave-generation method of defining inlet boundary conditions

针对滑坡涌浪灾害中波浪的产生和传播分析至关重要的问题,利用FLUENT软件平台,提出了边界造波的数值方法,并通过二次开发实现了二阶Stokes波的数值模拟。该边界造波法以不可压缩粘性流体的Navier-Stokes方程和追踪自由面的VOF法为基础,借助FLUENT软件中的UDF功能定义了入射边界处波浪的速度和波形解析表达式,从而模拟了二阶Stokes波的产生和传播。计算结果表明,该数值水槽能有效可靠的模拟弱非线性波浪。这为后续模拟由滑坡涌浪所产生的波浪提供了一定的研究基础。

In the study on the effects of landslide-induced waves on the downstream dam, the estimations of wave generation and wave propagation are important. Aiming at this type of hazard problem, this paper presents a numerical approach of wave-generation method of defining inlet boundary conditions for simulating the second-order Stokes wave through the redevelopment in FLUENT code. This wave-generation method is based on the Navier-Stokes equations and VOF method of tracing the free surface. The study is carried out through defining the analytical solutions of wave velocity and wave amplitude at the inlet boundary via the UDF （user defined function） in FLUENT code. The numerical results show this model can be available to simulate the weak nonlinear wave. This study will lay the first stone for the following simulation of landslide-induced wave.