波浪入射角度对立柱周围波面扰动特性的影响研究

基于N-S方程和连续性方程建立了三维数值波浪水池,并在该水池内对固定直立柱在不同浪向下的波浪爬升和绕射问题进行了数值模拟。为了验证数值计算的准确性,对立柱近壁面处的波浪爬升效应展开了模型试验研究,计算值与试验值吻合较好,证明了该方法的可行性。研究了入射角度的变化对立柱周围波浪爬升幅度和非线性特征的影响,同时从垂直浪向的投影面积和相对浪向的投影面形状这两个因素出发,探讨了不同浪向角下立柱周围的波浪叠加、波面放大率以及二次波峰效应,并对自由面漩涡生成特性进行了较为深入的机理性研究,可为今后进一步研究不同的入射角度下,复杂的海洋结构物周围的波浪非线性效应提供有价值的参考。

Incident angle effects on wave disturbance characteristics around column

3D numerical wave tank suitable for wave-body interactions is created based on N-S equations and continuity equations. Then wave run-up and diffraction effects around fixed vertical column are simu-lated in this numerical wave tank. In order to verify the accuracy of numerical calculation, model test about wave run-up near column wall is applied. Good agreement is obtained between calculation and model test, which indicates that this numerical method is feasible. The amplitude and non-linear effects of wave run-up due to the direction of incident wave are investigated. In addition, wave superposition, amplification and the secondary wave crest effects are also analysed, and the characteristics of vortex shedding on free sur-face are deeply studied, which will provide a reference for further research on the wave non-linear effects around complicated offshore structures in different incident wave directions.