【摘要】：實際海域中風浪往往共存,當極值波浪出現(xiàn)時,風會對其特性產(chǎn)生很大影響。為了研究風對極值波浪特性的影響規(guī)律,該文基于勢流理論建立自由水面滿足完全非線性邊界條件的風浪混合作用數(shù)值水槽模型,通過實時模擬造波板運動產(chǎn)生入射波,并基于波群聚焦原理定點產(chǎn)生極值波浪,利用改進的杰弗里斯遮蔽原理(Jeffreys'sheltering mechanism)將風壓引入到自由水面動力邊界條件中。在時域模擬中,采用混合歐拉-拉格朗日方法追蹤瞬時水面,利用格林第二定理建立了邊界積分方程,采用高階邊界元方法進行離散求解。通過與已發(fā)表實驗結(jié)果對比驗證模型的準確性,進而開展數(shù)值實驗研究風對極值波浪水動力特性的影響,包括聚焦幅值、聚焦位置和極值波高隨風速的變化以及波群聚焦和解焦過程波浪演變特性等。
[Abstract]:Wind waves often coexist in the actual sea area, when extreme waves appear, the wind will have a great influence on its characteristics. In order to study the influence of wind on extreme wave characteristics, a numerical flume model of wind-wave mixing on free water surface satisfying completely nonlinear boundary conditions is established based on the potential flow theory, and the incident wave is generated by real-time simulation of the motion of the wave-making plate. Based on the wave group focusing principle, extreme waves are generated at fixed points, and the wind pressure is introduced into the dynamic boundary conditions of free water surface by using the modified Jeffries masking principle (Jeffreys'sheltering mechanism). In the time domain simulation, the hybrid Euler-Lagrangian method is used to track the instantaneous water surface, the boundary integral equation is established by Green's second theorem, and the higher order boundary element method is used to discretize the solution. The accuracy of the model is verified by comparing with the published experimental results, and then numerical experiments are carried out to study the influence of wind on the hydrodynamic characteristics of extreme waves, including focusing amplitude. The variation of focusing position and extreme wave height with wind speed and the wave evolution characteristics in the process of focusing and defocusing of wave group.
【作者單位】： 大連理工大學海岸和近海工程國家重點實驗室;河海大學水文水資源與水利工程科學國家重點實驗室;
【基金】：國家自然科學基金(51222902,51490672) 教育部新世紀優(yōu)秀人才計劃(NCET-13-0076)~~
【分類號】：O353.2
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本文編號：2467588