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| Numerical Simulation of Breaking Wave Generated Sediment Suspensionand Transport Process Based on CLSVOF Algorithm | |
| 作者姓名： | 卢新华 张小峰 陆俊卿 董炳江 |
| 作者单位： | [1]State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University,;Wuhan 430072, China; [2]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University,;Nanjing 210098, China; [3]State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of;Water Resources and Hydropower Research, Beijing 100044, China; [4]South China Institute of Environmental Science, Ministry of Environmental Protection, Guangzhou 510655, China; [5]Hydrology Bureau, Yangtze River Water Resource Commission, Wuhan 430010, China |
| 基金项目： | This work was financially supported by the National Natural Science Foundation of China （Grant Nos. 51409195 and 51379155）, the Open Foundation of State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering （Grant No. 2013491111）, the China Postdoctoral Science Foundation （Grant No. 2014M550408）, the Fundamental Research Funds for the Central Universities （Grant No. 2042014kf0068）, and the Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin （China Institute of Water Resources and Hydropower Research, Grant No. IWHR-SKL-201112）. |
| 摘 要： | The sediment suspension and transport process under complex breaking wave situation is investigated using large eddy simulation （abbreviated as LES hereafter） method. The coupled level set （LS） and volume of fluid （VOF） method is used to accurately capture the evolution of air？water interface. The wall effect at the bottom is modeled based on the wave friction term while the complicate bottom boundary condition for sediment is tackled using Chou and Fringer’s sediment erosion and deposition flux method. A simulation is carried out to study the sediment suspension and transport process under periodic plunging breaking waves. The comparison between the results by CLSVOF method and those obtained by the LS method is given. It shows that the latter performs as well as the CLSVOF method in the pre-breaking weak-surface deformation situation. However, a serious mass conservation problem in the later stages of wave breaking makes it inappropriate for this study by use of the LS method and thus the CLSVOF method is suggested. The flow field and the distribution of suspended sediment concentration are then analyzed in detail. At the early stage of breaking, the sediment is mainly concentrated near the bottom area. During the wave breaking process, when the entrapped large-scale air bubble travels downward to approach the bottom, strong shear is induced and the sediment is highly entrained. |
| 关 键 词： | sediment suspension wave breaking subgrid-scale model CLSVOF level setLU Jun-qing (陆俊卿)c d and DONG Bing-jiang (董炳江)e |
Numerical simulation of breaking wave generated sediment suspension and transport process based on CLSVOF algorithm |
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| LU Xin-hua , ZHANG Xiao-feng , LU Jun-qing , DONG Bing-jiang.Numerical Simulation of Breaking Wave Generated Sediment Suspensionand Transport Process Based on CLSVOF Algorithm[J].China Ocean Engineering,2014,28(5):701-712. | |
| Authors: | LU Xin-hua ZHANG Xiao-feng LU Jun-qing DONG Bing-jiang |
| Institution: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University,Wuhan 430072, China;State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University,Nanjing 210098, China 2. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University,Wuhan 430072, China 3. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing 100044, China;South China Institute of Environmental Science, Ministry of Environmental Protection, Guangzhou 510655, China 4. Hydrology Bureau, Yangtze River Water Resource Commission, Wuhan 430010, China |
| Abstract: | The sediment suspension and transport process under complex breaking wave situation is investigated using large eddy simulation (abbreviated as LES hereafter) method. The coupled level set (LS) and volume of fluid (VOF) method is used to accurately capture the evolution of air-water interface. The wall effect at the bottom is modeled based on the wave friction term while the complicate bottom boundary condition for sediment is tackled using Chou and Fringer’s sediment erosion and deposition flux method. A simulation is carried out to study the sediment suspension and transport process under periodic plunging breaking waves. The comparison between the results by CLSVOF method and those obtained by the LS method is given. It shows that the latter performs as well as the CLSVOF method in the pre-breaking weak-surface deformation situation. However, a serious mass conservation problem in the later stages of wave breaking makes it inappropriate for this study by use of the LS method and thus the CLSVOF method is suggested. The flow field and the distribution of suspended sediment concentration are then analyzed in detail. At the early stage of breaking, the sediment is mainly concentrated near the bottom area. During the wave breaking process, when the entrapped large-scale air bubble travels downward to approach the bottom, strong shear is induced and the sediment is highly entrained. |
| Keywords: | sediment suspension wave breaking subgrid-scale model CLSVOF level set |
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