Research Papers: Fundamental Issues and Canonical Flows

Characteristics of the Wake Behind a Transversely Oscillating Cylinder Near a Wall

[+] Author and Article Information
S. Peter

Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati, Assam 781039, India

A. K. De

Department of Mechanical Engineering,
Indian Institute of Technology Guwahati,
Guwahati, Assam 781039, India
e-mail: akd@iitg.ernet.in

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received February 15, 2016; final manuscript received October 6, 2016; published online January 19, 2017. Assoc. Editor: Praveen Ramaprabhu.

J. Fluids Eng 139(3), 031201 (Jan 19, 2017) (8 pages) Paper No: FE-16-1098; doi: 10.1115/1.4035012 History: Received February 15, 2016; Revised October 06, 2016

In the present study, numerical investigation is carried out for flow past a transversely oscillating circular cylinder near a wall. A second-order finite-volume method employing diffuse interface immersed boundary method is used to handle the nonconforming boundaries. The cylinder is allowed to oscillate on a fixed Eulerian mesh in order to handle the moving boundary. Simulations are carried out for a number of forcing frequencies at three different gap distances and two amplitudes of oscillation with Reynolds number fixed at 200. While a pair of vortices is found to be shed near the stationary shedding frequency at larger gap distance, multiple interconnected vortices are observed at larger forcing frequencies. Proximity of the wall promotes greater interaction of the wall layer with the near wake resulting in inhibited irregular shedding. Energy transfer changes its direction when the correlation between the cylinder motion and the lift force is strongest. Positive energy transfer attains a peak at the onset of the synchronization regime accompanied by a weaker correlation. Amplitude of oscillation of the cylinder evidently has systematic effect on the drag coefficient and wake fluctuations, though lift force remains grossly unaltered. Lower amplitude of motion favors induced motion as opposed to larger ones where greater negative energy transfer occurs.

Copyright © 2017 by ASME
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Fig. 1

Schematic diagram of the flow geometry and boundary conditions

Grahic Jump Location
Fig. 2

Comparisons of CD and CL signals for transversely oscillating cylinder in freestream

Grahic Jump Location
Fig. 3

Time traces of CD and CL at different grid levels and domain sizes

Grahic Jump Location
Fig. 4

A blown-up view of the computing grid (M5) where every second grid line is shown

Grahic Jump Location
Fig. 5

Instantaneous vorticity field at extreme frequency ratios for A = 0.2

Grahic Jump Location
Fig. 6

Six instantaneous snapshots within one cycle of cylinder motion for g/d=0.5,fr=1.5, and A=0.2. The time instances are marked on the CL curve (solid line) plotted with the cylinder motion (dashed line) in the inset.

Grahic Jump Location
Fig. 7

Six instantaneous snapshots within one cycle of cylinder oscillation for g/d=2,fr=0.9, and A=0.2 as plotted in Fig.6

Grahic Jump Location
Fig. 8

Instantaneous vorticity field at extreme frequency ratios for A = 0.4

Grahic Jump Location
Fig. 9

Six instantaneous snapshots within one cycle of cylinder motion for g/d=2,fr=1.5, and A=0.4 as plotted in Fig. 6

Grahic Jump Location
Fig. 10

Frequency spectra of the lift signal; two left columns a/d=0.2 and two right columns a/d=0.4

Grahic Jump Location
Fig. 11

Normalized vortex shedding frequency fs by the natural shedding frequency fo as a function of the frequency ratio fr

Grahic Jump Location
Fig. 12

Time histories of CD and CL for fr=0.8 (odd rows) and 1.5 (even rows) at g/d=0.5 (first two rows), 1 (third and fourth rows), and 2 (last two rows) with a/d=0.2 (left column) and 0.4 (right column)

Grahic Jump Location
Fig. 13

Time histories of energy rate at three frequency ratios for a/d=0.2 (top two rows) and 0.4 (bottom two rows) with g/d=0.5 (odd rows) and 2 (even rows)

Grahic Jump Location
Fig. 14

Variation of correlation coefficient between the lift force (CL) and cylinder motion (ys) (left) and energy coefficient (CE) (right) with frequency ratio

Grahic Jump Location
Fig. 15

Average and RMS of drag 〈CD〉,CD′ and lift 〈CL〉,CL′ coefficients as a function of frequency ratio




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