速度边界造波法与推板造波法的差异化分析

Differentiation Analysis of Velocity Boundary Wave Making Method and Push Plate Wave Making Method

本文基于Navier-Stokes方程和VOF方法,建立了二维数值波浪水池,分别采用速度边界造波法和推板造波法模拟了二阶Stokes波,并在消波区采用了添加阻尼项和拉伸网格相结合的混合消波方式。对两种造波方法不同位置(5 m、10 m和15 m)及不同时刻的模拟参数与理论计算进行比较分析,结果与理论解吻合较好。研究结果表明,混合消波方式能极大降低网格数量而不影响造波质量,且合适的组合方式能促进收敛;开放出口边界与封闭的出口边界相比,气相更稳定,液相一致;两种造波方法都能产生良好的数值波浪,但因两种造波方法的造波方式、出口边界不同引起的结果的差异使其适用的场景产生变化。本文对在不同背景下构建良好的数值波浪水池有重要的参考作用。

Based on the Navier-Stokes equation and VOF method,a two-dimensional numerical wave pool is established.In this paper,the second-order Stokes waves are simulated by the velocity boundary wave creation method and the push-plate wave creation method,respectively,and a hybrid wave dissipation method combining the addition of damping terms and the stretching grid is used in the wave dissipation region.The results are compared with the theoretical wave amplitudes by comparing the ephemeral curves of wave amplitudes at different locations(5m,10m and 15m),the curves of wave amplitudes at different times,the pressure clouds and the velocity clouds of u and v.The results are in good agreement with the theoretical solutions.The results show that the hybrid wave elimination approach can greatly reduce the number of grids without affecting the quality of wave creation,and the suitable combination can promote convergence;the open exit boundary is more stable in the gas phase and consistent in the liquid phase compared with the closed exit boundary.Both numerical models are good numerical wave pools,and the differences in the results caused by the different wave creation methods and exit boundaries of the two wave creation methods make their applicable scenarios change,which is an important reference in this paper.