| NUMERICAL STUDY FOR EVOLUTION OF COHERENT VORTEX IN UNIDIRECTIONAL OSCILLATORY BOUNDARY LAYER OVER SAND RIPPLES |
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| 引用本文： | Bai Yu-chuan Institute for Sedimentation on River and Coast Engineering,Tianjin University,Tianjing 300072,China Ng Chiu-On Department of Mechanical Engineering,The University of Hongkong,Hongkong,China. NUMERICAL STUDY FOR EVOLUTION OF COHERENT VORTEX IN UNIDIRECTIONAL OSCILLATORY BOUNDARY LAYER OVER SAND RIPPLES[J]. 水动力学研究与进展(B辑), 2002, 14(4) |
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| 作者姓名： | Bai Yu-chuan Institute for Sedimentation on River and Coast Engineering Tianjin University Tianjing 300072 China Ng Chiu-On Department of Mechanical Engineering The University of Hongkong Hongkong China |
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| 作者单位： | Bai Yu-chuan Institute for Sedimentation on River and Coast Engineering，Tianjin University，Tianjing 300072，China Ng Chiu-On Department of Mechanical Engineering，The University of Hongkong，Hongkong，China |
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| 基金项目： | ThisworkwassupportedbytheNationalNaturalScienceFoundationofChina (GrantsNo:5 980 90 0 6,5 9890 2 0 0 )andCoun ciloftheHongkongSpecialAdministrativeRegion(GrantsNo :HKU7117199E ,HKU70 8110 2E) |
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| 摘 要： | 1 . ＩＮＴＲＯＤＵＣＴＩＯＮＳｈｅａｒｆｌｏｗｓｐａｓｔｗａｖｙ ｌｉｋｅｂｏｕｎｄａｒｉｅｓｈａｖｅａｔ ｔｒａｃｔｅｄｃｏｎｓｉｄｅｒａｂｌｅａｔｔｅｎｔｉｏｎｉｎｒｅｃｅｎｔｙｅａｒｓｂｅ ｃａｕｓｅｏｆｔｈｅｃｅｎｔｒａｌｒｏｌｅｔｈｅｙ ｐｌａｙｉｎｓｅｖｅｒａｌｉｎ ｔｒｉｇｕｉｎｇ ｐｈｅｎｏｍｅｎａ ,ｓｕｃｈａｓｔｈｅ ｇｅｎｅｒａｔｉｏｎｏｆｗｉｎｄｗａｖｅｓｏｎｗａｔｅｒ ,ｔｈｅｆｏｒｍａｔｉｏｎｏｆｓｅｄｉｍｅｎｔａ ｒｙｒｉｐｐｌｅｓａｎｄｄｕｎｅｓｉｎｄｅｓｅｒｔｓａｎｄｒｉ…
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NUMERICAL STUDY FOR EVOLUTION OF COHERENT VORTEX IN UNIDIRECTIONAL OSCILLATORY BOUNDARY LAYER OVER SAND RIPPLES |
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| Bai Yuc-huan,NG Chiu-on. NUMERICAL STUDY FOR EVOLUTION OF COHERENT VORTEX IN UNIDIRECTIONAL OSCILLATORY BOUNDARY LAYER OVER SAND RIPPLES[J]. Journal of Hydrodynamics, 2002, 14(4) |
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| Authors: | Bai Yuc-huan NG Chiu-on |
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| Abstract: | Ripples are widely formed in river channels and coastal regions, the bed-forms and vortex dynamics accompanied with them are quite important because they are responsible for frictions and sediment transports. The coherent vortex structure play a key role in the process, so how to model them is needed for understanding the formation process of sand ripples. In this paper, 2D Large-Eddy-Simulation (LES) was used to predict the flow structure and the dynamics of coherent vortex. The numerical results show a complete process of formation, evolvement and disappearance for the cases of unidire ctional and oscillatory flows over symmetic and asymmetric ripples |
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| Keywords: | oscillatory flow large eddy simulation sand ripple river channel |
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