| A Numerical Study on the Structure and Dynamics of Turbulence in Oscillatory Bottom Layer Flow over A Flat or Rippled Bed |
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| 作者姓名： | 白玉川 吴朝安 黄涛 |
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| 作者单位： | Institute of Sediment on River and Coast Engineering Tianjin University Tianjin300072，China，Institute of Sediment on River and Coast Engineering Tianjin University Tianjin300072，China，Department of Mechanical Engineering The University ofHong Kong Hong Kong China，Institute of Sediment on River and Coast Engineering Tianjin University Tianjin300072，China |
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| 基金项目： | This research work was supported by the National Natural Science Foundation of China （NSFC） and the Research Grants Council of the Hong Kong Special Administrative Region, through Projects 40376028, 50279030, HKU 7081/ 02E, and HKU 7199/03E. |
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| 摘 要： | 1 .IntroductionUnder the influence of surface waves ,sandripples often appear on beaches . Whenthe amplitudeof water oscillationis sufficientlylarge ,vortices are formed onthe lee of every sand ripple crest . A-mongthese vortices ,the most important are t…
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| 关 键 词： | 边界层 数值模型 海洋动力学 波纹 波浪 |
| 收稿时间： | 2005-06-27 |
| 修稿时间： | 2005-10-17 |
A Numerical Study on the Structure and Dynamics of Turbulence in Oscillatory Bottom Layer Flow over A Flat or Rippled Bed |
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| BAI Yu-chuan,NG Chiu-On,HUANG Tao.A Numerical Study on the Structure and Dynamics of Turbulence in Oscillatory Bottom Layer Flow over A Flat or Rippled Bed[J].China Ocean Engineering,2006,20(1):45-60. |
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| Authors: | BAI Yu-chuan NG Chiu-On HUANG Tao |
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| Abstract: | This paper is mainly concerned with the turbulence in oscillatory bottom boundary layers over flat or rippled seabeds.Owing to the strong shear and anisotropy of oscillatory flow,an anisotropic turbulence mathematical model is set up using the finite difference method,and the computational results of the model are verified by comparisons with well-known experiments.Turbulent energy,dissipation and Reynolds stress can all be computed with this mathematical mod-el,and the development processes of a large coherent vortex structure over a rippled bed,such as main flow separation,coherent vortex formation and curling,coherent vortex ejection and breaking up,are successfully simulated. |
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| Keywords: | oscillatory boundary layer flow anisotropic turbulence model sand ripples $$ |
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