0
TECHNICAL PAPERS

Flow Structure in the Wake of a Rotationally Oscillating Cylinder

[+] Author and Article Information
F. M. Mahfouz, H. M. Badr

Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia

J. Fluids Eng 122(2), 290-301 (Nov 15, 1999) (12 pages) doi:10.1115/1.483257 History: Received June 15, 1998; Revised November 15, 1999
Copyright © 2000 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fourier analysis of the far wake for two non-lock-on regimes at Re=200 and (a) ΘA=π/4,FR=1/2, (b) ΘA=π/8,FR=2
Grahic Jump Location
(a) The time variation of lift and drag coefficients for a non-lock-on regime at Re=200, ΘA=π/4 and FR=0.5. (b) The time variation of lift and drag coefficients for a non-lock-on regime at Re=200, ΘA=π/8 and FR=2.
Grahic Jump Location
The time variation of tangential velocity component, drag coefficient and lift coefficient for the case of a fixed cylinder at Re=200.
Grahic Jump Location
Time development of velocity components along θ=0 and comparison with experimental results of Coutanceau and Menard 18 at Re=200 and α=1/2. Experimental values: • t=1; ○ t=2; ⊕ t=3; ▵ t=4; ⋄ t=5; ★ t=6; Theoretical curves (a) x-component, (b) y-component.
Grahic Jump Location
The time development of the x-component of velocity along θ=0 at Re=550; —— present results; ––– numerical results of Ta Phuoc Loc 17.
Grahic Jump Location
The streamline pattern for impulsively started over a fixed cylinder for the case of Re=3000 at t=3 and comparison with previous results; (a) present study, (b) experimental, and (c) theoretical results obtained by Ta Phuoc Loc and Bouard 16.
Grahic Jump Location
The physical model and coordinate system
Grahic Jump Location
The time variation of the lift coefficient for the case of Re=40, S=0.1 and α=0.2 and comparison with the numerical results of Okajima et al. 5.
Grahic Jump Location
The time variation of the lift coefficient for a lock-on regime in case of Re=200, ΘA=π/4 and FR=0.83 and 1.11
Grahic Jump Location
The time variation of surface pressure distribution for an non lock-on regime during (a) one complete cycle in case of Re=200, ΘA=π/4 and FR=1/2, (b) two complete cycle in case of Re=200, ΘA=π/8 and FR=2
Grahic Jump Location
Streamline patterns (left) equi-vorticity patterns (right) for one complete cycle in case of Re=200, ΘA=π/4 and FR=1/2 at times (a) t=40, (b) t=42.75, (c) t=45.5, (d) t=48.25, (e) t=51, (f) t=53.75, (g) t=56.5, (h) t=59.25, (i) t=62
Grahic Jump Location
Streamline patterns (left) and equi-vorticity patterns (right) for one complete cycle of cylinder oscillation in case of Re=200, ΘA=π/2 and FR=1.11 at times (a) t=to. (b) t=to+1/4Tp, (c) t=to+1/2Tp, (d) t=to+3/4Tp, (e) t=to+Tp.
Grahic Jump Location
The time variation of the lift coefficient and corresponding Fourier analysis for the case of Re=200, ΘA=π/8 and FR=1.25: (a) lift coefficient, (b) Fourier analysis.
Grahic Jump Location
Effect of oscillation amplitude on the time variation of lift coefficient at Re=200 and FR=0.5
Grahic Jump Location
The time variation of lift and drag coefficients and angular velocity in the far wake (r=10, θ=0) at Re=200, ΘA=π/2 and (a) FR=1.11, (b) FR=1.5, and (c) FR=2
Grahic Jump Location
Streamline patterns (left) and equi-vorticity patterns (right) for one complete cycle of cylinder oscillation in case of Re=200, ΘA=π/2 and FR=1.11 at times (a) t=to. (b) t=to+1/4Tp, (c) t=to+1/2Tp, (d) t=to+3/4Tp, (e) t=to+Tp.
Grahic Jump Location
Frequency selection diagram
Grahic Jump Location
(a) The time variation of lift and drag coefficients and angular velocity in the far wake at Re=200, ΘA=π/2 and FR=0.83 and the corresponding Fourier analysis of (b) the near wake and (c) the far wake.
Grahic Jump Location
The effect of frequency ratio on the time-averaged lift and drag coefficients at Re=100, ΘA=π/8 and π/4; (a) lift coefficient and (b) drag coefficient. ––– ΘA=π/8; —— ΘA=π/4.
Grahic Jump Location
Effect of frequency on average amplitude of lift coefficient and comparison with previous studies for the case of Re=80 and α=0.2. ∏ present study; —— experimental and ⋄ numerical results of Okajima et al. 5.
Grahic Jump Location
Streamline patterns (left) and equi-vorticity patterns (right) for one complete cycle in case of Re=200, ΘA=π/2 and FR=0.83 at times (a) t=to. (b) t=to+1/4Tp, (c) t=to+1/2Tp, (d) t=to+3/4Tp (e) t=to+Tp where Tp is the time period of cylinder oscillation.

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In