孤立波数值造波研究

A Study on Numerical Generation of Solitary Wave

基于开源平台OpenFOAM研究开发一种可模拟推板运动的动边界条件,实现推板造波数值模拟.以孤立波为研究对象,基于Goring孤立波造波理论以及Fenton九阶孤立波解,确定两种推板运动形式,并据此对孤立波造波和传播过程进行模拟.数值模拟结果表明,基于Goring方法所得到的孤立波后方水面凹陷现象较基于Fenton方法所得到的孤立波后方水面凹陷现象更为显著,且波高衰减更快.将数值模拟结果与水槽试验结果进行比较,对两者之间的差别进行分析和讨论.

To realize the simulation of wave generations by a piston-type wave maker, a dynamic boundary condition is developed to simulate the motion of a paddle based on the open source platform OpenFOAM. Taking the solitary wave as an example, two types of motion which are derived from the Goring-s theory for generation of solitary wave and the Fenton-s ninth order solution of solitary wave are determined. Based on that, the generations of solitary wave and its propagation are studied. The numerical results show that the depression of the free surface behind the Goring-based solitary wave is more significant than that behind the Fenton-based wave and the Goring-based wave height decays more quickly.