Wake of a Vibrating Cylinder at Re = 105

2011 ◽  
Author(s):  
R. D. Blevins ◽  
Jean-Franc¸ois Saint-Marcoux
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Flow Visualization ◽  
Vortex Dynamics ◽  
Velocity Profiles ◽  
Near Wake ◽  
Vortex Induced Vibration ◽  
Cylinder Flow

Measurements have been made of the wake of a circular cylinder at Reynolds number of 105 for a stationary cylinder and a cylinder vibrating +/− 1.25 diameters under natural vortex induced vibration. Wake velocity profiles were taken at 2, 4, 6, 12, 24 and 50 diameters downstream. The stationary cylinder profile reproduces the well known wake deficit law. The vibrating cylinder near wake is wider, deeper and flatter than that of the stationary cylinder. Flow visualization reveals the vortex dynamics in the wake. Correlation is shown with theory.

Transverse vortex-induced vibration of a circular cylinder on a viscoelastic support at low Reynolds number

2020 ◽  
Vol 95 ◽  
pp. 102997 ◽  
Author(s):  
Rahul Mishra ◽  
Atul Soti ◽  
Rajneesh Bhardwaj ◽  
Salil S. Kulkarni ◽  
Mark C. Thompson
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
Low Reynolds Number ◽  
Vortex Induced Vibration ◽  
Low Reynolds

On vortex formation from a cylinder. Part 1. The initial instability

1988 ◽  
Vol 190 ◽  
pp. 491-512 ◽  
Author(s):  
M. F. Unal ◽  
D. Rockwell
Keyword(s):  
Reynolds Number ◽  
Kinetic Energy ◽  
Circular Cylinder ◽  
Shear Layer ◽  
Vortex Shedding ◽  
Vortex Formation ◽  
Absolute Instability ◽  
Near Wake ◽  
Lower Range ◽  
Fluctuation Amplitude

Vortex shedding from a circular cylinder is examined over a tenfold range of Reynolds number, 440 ≤ Re ≤ 5040. The shear layer separating from the cylinder shows, to varying degrees, an exponential variation of fluctuating kinetic energy with distance downstream of the cylinder. The characteristics of this unsteady shear layer are interpreted within the context of an absolute instability of the near wake. At the trailing-end of the cylinder, the fluctuation amplitude of the instability correlates well with previously measured values of mean base pressure. Moreover, this amplitude follows the visualized vortex formation length as Reynolds number varies. There is a drastic decrease in this near-wake fluctuation amplitude in the lower range of Reynolds number and a rapid increase at higher Reynolds number. These trends are addressed relative to the present, as well as previous, observations.

Obtaining phase averaged turbulence properties in the near wake of a circular cylinder at high Reynolds number using POD

2007 ◽  
Vol 43 (2-3) ◽  
pp. 341-355 ◽  
Author(s):  
R. Perrin ◽  
M. Braza ◽  
E. Cid ◽  
S. Cazin ◽  
A. Barthet ◽  
...  
Keyword(s):  
Reynolds Number ◽  
Circular Cylinder ◽  
High Reynolds Number ◽  
Near Wake ◽  
High Reynolds
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