Numerical modeling of energy dissipation of internal solitary waves encountering step topography

被引:6
作者
Wang, Chunling [1 ,3 ]
Huang, Biao [2 ,3 ]
Xu, Tibing [2 ,3 ]
Zhu, David Z. [2 ,3 ]
Wang, Lingling [5 ]
Wang, Yin [4 ]
机构
[1] Taizhou Univ, Sch Civil Engn & Architecture, Taizhou 318000, Zhejiang, Peoples R China
[2] Univ Alberta, Edmonton, AB T6G 2W2, Canada
[3] Ningbo Univ, Inst Marine Engn, Ningbo 315200, Zhejiang, Peoples R China
[4] Nanchang Inst Technol, Sch Hydraul & Ecol Engn, Nanchang 330099, Jiangxi, Peoples R China
[5] Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul Eng, Nanjing 210024, Jiangsu, Peoples R China
关键词
Internal solitary waves; Energy dissipation; Step topography; Numerical simulation; 2-LAYER FLUID SYSTEM; GRAVITY-WAVES; BREAKING; PROPAGATION; GENERATION; SIMULATION; EVOLUTION;
D O I
10.1016/j.oceaneng.2022.111853
中图分类号
U6 [水路运输]; P75 [海洋工程];
学科分类号
0814 ; 081505 ; 0824 ; 082401 ;
摘要
In this study, we conducted simulation experiments using a large-eddy simulation method to examine the interaction of internal solitary waves (ISWs) with step topography. We investigated the propagation, transmission, reflection, and breaking of depression ISWs. The features of ISW depend on the geometrical parameters of the step topography that define the initial setting. The relationships between the ISWs geometric and energy loss features as well as the initial setting parameters were analyzed; related empirical relations were developed. Following the analysis of the vortex changes during the process of wave-topography interaction, the different breaking processes and their development rules were discussed. The results showed that, as the obstacle height increased, the degree of energy conversion during the interaction increased. There is no explicit relationship between the loss of energy and energy conversion during the interaction of an ISW with an obstacle. The maximum wave energy loss obtained by eliminating the effect of the tailed wave generated during wave generation and considering the energy conversion is approximately 5%-10% lower than that obtained with traditional methods. Additionally, the mode-2 ISW was detected during the wave-topography interaction, and its velocity profiles in the vertical direction were analyzed, which may be one of the reasons for the accelerated energy dissipation in the system.
引用
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页数:12
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