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http://dx.doi.org/10.3795/KSME-B.2002.26.4.515

Characteristics of Flow Over a Rotationally Oscillating Cylinder  

Choe, Hae-Cheon (Dept.of Mechanical Aerospace Engineering, Seoul National University)
Choe, Seong-Ho (Graduate School of Seoul National University)
Gang, Sang-Mo (Dept.of Automotive Industry Mechanical Engineering, Daegu University)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.26, no.4, 2002 , pp. 515-523 More about this Journal
Abstract
Effects of rotary oscillation on unsteady laminar flow past a circular cylinder have been investigated in this study. Numerical simulations are performed for the flow at Re=100 in the range of 0.2<$\Omega$<2.5 and 0.02<$St_f$<0.8, where $\Omega$ and $St_f$ are, respectively, the maximum rotation velocity and rotation frequency normalized by the free-stream velocity and cylinder diameter. Results show that rotary oscillation has significant effects on the flow. When the rotation frequency is near the natural vortex-shedding frequency, lock-on occurs and the lock-on frequency range becomes wider as the rotation velocity increases. In a certain range of the rotation frequency and velocity, modulations in the velocity, lift and drag signals occur and this modulation frequency is expressed as a linear combination of the rotation frequency and vortex-shedding frequency. The mean drag and amplitude of the lift fluctuations show local minima near the boundary between the lock-on non and lock-on regions.
Keywords
Rotary Oscillation; Circular Cylinder; Drag; Lift; Vortex Shedding; Lock-on;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Kang, S., Choi, H. & Lee, S. 1999, 'Laminar Flow past a Rotating Circular Cylinder,' Phys. Fluids, Vol. 11, pp. 3312-3321   DOI
2 백성진, 성형진 1998, '주기적으로 회전하는 원형 실린더 후류의 수치 모사,' 대한기계학회논문집 22권 3호, 267-279   과학기술학회마을
3 부정숙, 양종필, 신영곤, 김창수 1998, '균일류의 회전원주 제어에 의한 듀동 밀 공력 제어효과에 관한 연구,' 대한기계학회논문집 22권 3호, 346-359   과학기술학회마을
4 Park, J., Kwon, K. & Choi, H. 1998, 'Numerical Solution of Flow past a Circular Culinder at Reynolds Number up to 160,' KSME Int. J., Vol. 12, pp. 1200-1205   DOI
5 Min, C. & Choi, H., 1999, 'Suboptimal Feedback Control of Vortex Shedding at Low Reynolds Numbers,' J. Fluid Mech., Vol. 401, pp. 123-156   DOI   ScienceOn
6 Ongoren, A. & Rockwell, D. 1988, 'Flow Structure from an Oscillating Cylinder. Part 1. Mechanisms of Phase Shift and Recovery in the Near Wake,' J. Fluid Mech., Vol. 191, pp. 197-223   DOI
7 Beaudan, P. & Moin, P. 1994, 'Numerical Experiments on the Flow past a Circular Cylinder at Subcritical Reynolds Number,' Rep. TF-62, Department of Mechanical Engineering, Stanford Univ., Stanford, CA
8 Tokumaru, P. T. & Dimotakis, P. E. 1991, 'Rotary Oscillation Control of a Cylinder Wake,' J. Fluid Mech., Vol. 224, pp. 77-90   DOI
9 Choi, H. & Moin, P. 1994, 'Effects of the Computational Time Step on Numerical Solutions of Turbulent Flow,' J. Comp. Phys., Vol. 113, pp. 1-4   DOI   ScienceOn
10 Choi, H., Moin, P. & Kim, J. 1993, 'Direct Numerical Simulation of Turbulent Flow over Riblets,' J. Fluid Mech., Vol. 255, pp. 503-539   DOI   ScienceOn
11 Pauley, L. L., Moin, P. & Reynolds, W. C. 1990, 'The Structure of Two Dimensional Separation,' J. Fluid Mech., Vol. 220, pp. 397-411   DOI
12 Baek, S.-J & Sung, H. J. 2000, 'Quasi-Periodicity in the Wake of a Rotationally Oscillating Cylinder,' J. Fluid Mech., Vol. 408, pp. 275-300   DOI   ScienceOn
13 Williamson, C. H. K. 1996, 'Vortex Dynamics in the Cylinder Wake,' Annu. Rev. Fluid Mech., Vol. 28, pp. 477-539   DOI   ScienceOn
14 Nishioka, M. & Sato, H. 1974, 'Measurement of Velocity Distributions in the Wake of a Circular Cylinder at Low Reynolds Numbers,' J. Fluid Mech., Vol. 65, pp. 97-112   DOI
15 Kwon, K. & Choi, H. 1996, 'Control of Laminar Vortex Shedding behind a Circular Cylinder using Splitter Plates,' Phys. Fluids, Vol. 8, pp. 479-486   DOI
16 Lofty, A. & Rockwell, D. 1993, 'The Near-Wake of an Oscillating Trailing Edge: Mechanisms of Periodic and Aperiodic Response,' J. Fluid Mech., Vol. 251, pp. 173-201   DOI   ScienceOn
17 Baek, S.-J. & Sung, H. J. 1998, 'Numerical Simulation of the Flow behind a Rotary Oscillating Circulat cylinder,' Phys. Fluid, Vol. 10, pp. 869-876   DOI   ScienceOn
18 Mahfouz, F. M. & Badr, H. M. 2000, 'Flow Structure in the Wake of a Rotationally Oscillating Cylinder,' J. Fluids Engng., Vol. 122, pp. 290-301   DOI   ScienceOn
19 Taneda, S. 1978, 'Visual Observation of the Flow past a Circular Cylinder Performing a Rotatory Oscillation,' J. Phys. Soc. Jpn., Vol. 45, pp. 1038-1043   DOI   ScienceOn