Drag increment due to internal waves generated by Rankine ovoid

作     者：XU Zhaoting, ZHOU Xiwu and CHEN Xu(1. Institute of Physical Oceanography and Physical Oceanography Laboratory, Ocean University of Qingdao, Qingdao 266003, China 2. Key Laboratory of Marine Science and Numerical Modeling of State Oceanic Administration, Qingdao 266061, China) 

作者机构：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 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2002年第11期

页      面：51-55页

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：the National Natural Science Foundation of China (Grant No. 49776284) The Research Fund for the Doctoral Program of Higher Education (No.2000042309) 99JS21.6.1.JW1002 

主　　题：internal wave wake stratified flow drag increment. 

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 △Cd 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 △Cd, which is equal to 0.05 in the exciting region of the strong internal wave generation.