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Generation of vortices by a streamwise oscillating cylinder

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Abstract

The wake of a streamwise oscillating cylinder is presently investigated. The Reynolds number investigated is 300, based on the cylinder diameterd. The cylinder oscillates at an amplitude of 0.5d and a frequencyf e/fs=1.8, wheref e is the cylinder oscillating frequency andf s is the natural vortex shedding frequency of a stationary cylinder. Under these conditions the flow is essentially two dimensional. A two-dimensional direct numerical simulation (DNS) scheme has been developed to calculate the flow. The DNS results display a street of binary vortices, each containing two counter-rotating vortical structures, symmetrical about the centerline, which is in excellent agreement with measurements. The drag and lift on the cylinder have been examined. The time averaged drag and lift are 1.4 and 0, respectively, which are the same as those on a stationary cylinder at the sameRe. However, the fluctuating drag was high, about 2.68. It has been found that, being symmetrically formed about the centerline, the binary vortices induce an essentially zero fluctuating lift, which may have a profound implication in flow control and engineering.

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Authors and Affiliations

  1. Dept. of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong

    Alam Md. Mahbub & Zhou Y.

  2. Dept. of Engineering Mechanics, Tsinghua University, 100084, Beijing, China

    Fu S.

Authors
  1. Alam Md. Mahbub
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  2. Fu S.
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  3. Zhou Y.
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Additional information

Md. Mahbub Alam: He served as a lecturer in the Department of Mechanical Engineering at Rajshahi University of Engineering and Technology (Bangladesh) in 1995–1998. He taught Fluid Mechanics, Engineering Mechanics and Solid Mechanics to undergraduate students. He pursued his M.Sc. and PhD degree with Prof. Hiroshi Sakamoto at Kitami Institute of Technology (Japan) during 1999–2001 and 2001–2004, respectively. After obtaining PhD degree, he has been working as a Post-Doctoral Fellow at The Hong Kong Polytechnic University since August 2004. His current research interest focuses on bluff-body aerodynamics, fluid dynamics on multiple structures, flow control, flow-induced vibrations, wavelet application in fluid mechanics and signal analysis. He published 15 journal papers and more than 20 conference papers. He has acted as a reviewer for some engineering journals.

Song Fu: He received his B.Sc.(Hon) degree in Mechanical Engineering in 1983 from Imperial College London and Ph.D. degree in Mechanical Engineering in 1988 from the University of Manchester. After obtaining Ph.D. degree he joined Tsinghua University till now. He is currently a full professor and deputy dean of the School of Aerospace Engineering. His current research interests include turbulence modeling, computational fluid dynamics and turbomachinery.

Yu Zhou: He completed his PhD degree in 1992 at The University of Newcastle (Australia) and joined The Hong Kong Polytechnic University in 1995. His research interests include turbulent flows and control, flow-induced vibrations and control. He has authored or co-authored more than 200 technical papers, including more than 100 international journal and book articles, 7 being published in prestigious Journal of Fluid Mechanics. Two articles, published in Journal of Fluid Mechanics in 2001 and 2002, respectively, have been listed in the TOP 1% MOST CITED ARTICLES within its field in 2005 by THOMSON according to Essential Science Indicators. Since 1996, he has attracted a research fund of more than 25 million HK dollars (or 3 million US dollars) from both internal and external sources and successfully supervised 7 PhD theses. Along with Dr H Li, he received 2003 VSJ Paper Award of the Visualization Society of Japan.

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Alam, M.M., Fu, S. & Zhou, Y. Generation of vortices by a streamwise oscillating cylinder. J Vis 10, 65–73 (2007). https://doi.org/10.1007/BF03181805

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  • DOI: https://doi.org/10.1007/BF03181805

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