| Drag increment due to internal waves generated by Rankine ovoid |
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| 引用本文： | XU Zhaoting,ZHOU Xiwu,CHEN Xu. Drag increment due to internal waves generated by Rankine ovoid[J]. 自然科学进展(英文版), 2002, 12(11): 849-853 |
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| 作者姓名： | XU Zhaoting ZHOU Xiwu CHEN Xu |
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| 作者单位： | Institute of Physical Oceanography and Physical Oceanography Laboratory, Ocean University of Qingdao, Qingdao 266003, China;Key Laboratory of Marine Science and Numerical Modeling of State Oceanic Administration, Qingdao 266061, China,Institute of Physical Oceanography and Physical Oceanography Laboratory, Ocean University of Qingdao, Qingdao 266003, China,Institute of Physical Oceanography and Physical Oceanography Laboratory, Ocean University of Qingdao, Qingdao 266003, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (Grant No.49776284), The Research Fund for the Doctoral Program of Higher Education (No.2000042309) and 99JS21.6.1.JW1002 |
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| 摘 要： | The experimental results on drag increment caused by internal waves, which are generated by a Rankine ovoid towed horizontally at constant velocities in a two-layer stratified water (a strong pycnocline) initially at rest, are presented. The drag increment due to stratification is obtained experimentally as a function of internal Froude number Frd and Reynolds number Re. From the results, it is shown that as a function of Frd or Re, an increment in mean drag coefficient due to stratification ΔCd has both increasing and decreasing region attributable respectively to internal wave and to collapse of mixing fluids in the wakes. A most significant result shows that when Frd=0.838 there exists a maximum of ΔCd, which is equal to 0.05 in the exciting region of the strong internal wave generation.
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| 关 键 词： | internal wave wake stratified flow drag increment |
Drag increment due to internal waves generated by Rankine ovoid |
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| Xu Zhaoting,ZHOU Xiwu,CHEN Xu. Drag increment due to internal waves generated by Rankine ovoid[J]. Progress in Natural Science, 2002, 12(11): 849-853 |
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| Authors: | Xu Zhaoting ZHOU Xiwu CHEN Xu |
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| Affiliation: | 1. Institute of Physical Oceanography and Physical Oceanography Laboratory, Ocean University of Qingdao, Qingdao 266003, China;Key Laboratory of Marine Science and Numerical Modeling of State Oceanic Administration, Qingdao 266061, China
2. Institute of Physical Oceanography and Physical Oceanography Laboratory, Ocean University of Qingdao, Qingdao 266003, China |
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| Abstract: | The experimental results on drag increment caused by internal waves, which are generated by a Rankine ovoid towed horizontally at constant velocities in a two-layer stratified water (a strong pycnocline) initially at rest, are presented. The drag increment due to stratification is obtained experimentally as a function of internal Froude number Frd and Reynolds number Re. From the results, it is shown that as a function of Frd or Re, an increment in mean drag coefficient due to stratification ΔCd has both increasing and decreasing region attributable respectively to internal wave and to collapse of mixing fluids in the wakes. A most significant result shows that when Frd=0.838 there exists a maximum of ΔCd, which is equal to 0.05 in the exciting region of the strong internal wave generation. |
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| Keywords: | internal wave wake stratified flow drag increment |
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