Flow field characterization of a rotating cylinder

Hwang, J.Y., Yang, K.S., Yoon, D.H. and Bremhorst, K. (2008) Flow field characterization of a rotating cylinder. International Journal of Heat And Fluid Flow, 29 5: 1268-1278. doi:10.1016/j.ijheatfluidflow.2008.04.008


Author Hwang, J.Y.
Yang, K.S.
Yoon, D.H.
Bremhorst, K.
Title Flow field characterization of a rotating cylinder
Journal name International Journal of Heat And Fluid Flow   Check publisher's open access policy
ISSN 0142-727X
Publication date 2008-10-01
Year available 2008
Sub-type Article (original research)
DOI 10.1016/j.ijheatfluidflow.2008.04.008
Open Access Status Not yet assessed
Volume 29
Issue 5
Start page 1268
End page 1278
Total pages 10
Editor Launder , B.E.
Schmidt, F.W.
Kasagi, N.
Place of publication United States
Publisher Elsevier Inc.
Language eng
Subject C1
0913 Mechanical Engineering
970102 Expanding Knowledge in the Physical Sciences
Abstract Direct numerical simulation is used to study the flow field around an infinitely long circular cylinder rotating in fluid with no outer boundary. Wall shear stresses and normal pressure fluctuations are considered with reference to flat, non-rotating geometries to help identify any flow field differences introduced by Coriolis forces. In the present case, Coriolis forces are experienced only by the turbulence field. The dominant effect is to decrease the streamwise turbulent velocity level relative to the other two components. A consequential effect is that the two components of wall shear stress fluctuations become almost equal and spectra for streamwise and spanwise wall shear stress fluctuations become almost identical. This is a distinctly different behaviour from that of non-rotating flat plate and straight pipe flows. Instantaneous wall shear stress fluctuations indicate a near wall flow structure similar to that of other boundary layers with sweeps and ejections. No flow reversals of wall shear stress are indicated. A good correlation of the wall shear stresses and the turbulent kinetic energy exists for y(+) < 10. Budgets of Reynolds normal stress components illustrate the role played by Coriolis forces in the production and redistribution of turbulence energies. Wall pressure fluctuations are found to be of much larger spatial extent than velocity fluctuation scales while the probability density distribution of pressure fluctuations is almost Gaussian but does display a Reynolds number effect for skewness and Kurtosis. The ratio of rms pressure fluctuations to mean streamwise wall shear stress follows closely that for flat plate boundary layer and channel flows. (C) 2008 Elsevier Inc. All rights reserved.
Keyword Engineering, Chemical
Engineering
ENGINEERING, CHEMICAL
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2009 Higher Education Research Data Collection
School of Mechanical & Mining Engineering Publications
 
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Created: Wed, 08 Apr 2009, 19:28:30 EST by Rose Clements on behalf of School of Mechanical and Mining Engineering