三维数值波浪水槽内孤立波特性分析

内孤立波对密度层化水体的水动力及分层特性具有显著影响。为揭示内孤立波特性,建立了规则地形下可有效模拟弱非线性内孤立波的分层流三维数值波浪水槽,研究了内孤立波在规则地形条件下的传播,成功捕捉到了水体表面存在的辐聚流和辐散流,探讨了内孤立波传播过程中流速、紊动能和紊动能耗散率的分布与演化特性,为进一步利用数值波浪水槽研究内孤立波能量特性分布、改善层化水体的水生态环境提供了可靠的方法与手段。

Analysis of Internal Solitary Waves Characteristics of 3D Numerical Wave Flume

Internal solitary waves have a significant impact on the hydrodynamic and hierarchical characteristics of the density-stratified water body. In order to reveal the nature of internal solitary waves, a density-stratified three-dimensional numerical wave flume in regular terrain is established. The computed results show that this numerical wave flume can reproduce the effective weakly nonlinear solitary waves. By using the numerical method, the propagation of internal solitary waves is studied and the water surface convergence flow as well as the divergence flow is successfully captured. The distribution and the evolution of mean flow, turbulent kinetic energy and turbulent kinetic energy dissipation rate are investigated. This paper provides a reliable method for the further study of wave energy characteristics distribution in numerical wave flume and the improvement of the layered water in ecological environment.