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Numerical predictions of low Reynolds number flows over two tandem circular cylinders

Sharman, Bruce; Lien, FS; Davidson, Lars and Norberg, Christoffer LU (2005) In International Journal for Numerical Methods in Fluids 47(5). p.423-447
Abstract
Flows over two tandem cylinders were analysed using the newly developed collocated unstructured computational fluid dynamics (CUCFD) code, which is capable of handling complex geometries. A Reynolds number of 100, based on cylinder diameter, was used to ensure that the flow remained laminar. The validity of the code was tested through comparisons with benchmark solutions for flow in a lid-friven cavity and flow around a single cylinder. For the tandem cylinder flow, also mesh convergence was demonstrated, to within a couple of percent for the RMS lift coefficient. The mean and fluctuating lift and drag coefficients were recorded for centre-to-centre cylinder spacings between 2 and 10 diameters. A critical cylinder spacing was found between... (More)
Flows over two tandem cylinders were analysed using the newly developed collocated unstructured computational fluid dynamics (CUCFD) code, which is capable of handling complex geometries. A Reynolds number of 100, based on cylinder diameter, was used to ensure that the flow remained laminar. The validity of the code was tested through comparisons with benchmark solutions for flow in a lid-friven cavity and flow around a single cylinder. For the tandem cylinder flow, also mesh convergence was demonstrated, to within a couple of percent for the RMS lift coefficient. The mean and fluctuating lift and drag coefficients were recorded for centre-to-centre cylinder spacings between 2 and 10 diameters. A critical cylinder spacing was found between 3.75 and 4 diameters. The fluctuating forces jumped appreciably at the critical spacing. It was found that there exists only one reattachment and one separation point on the downstream cylinder for spacings greater than the critical spacing. The mean and the fluctuating surface pressure distributions were compared as a function of the cylinder spacing. The mean and the fluctuating pressures were significantly different between the upstream and the downstream cylinders. These pressures also differed with the cylinder spacing. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
unstructured grid, two tandem circular cylinder, unsteady flows
in
International Journal for Numerical Methods in Fluids
volume
47
issue
5
pages
423 - 447
publisher
John Wiley & Sons
external identifiers
  • wos:000226732300004
  • scopus:13444250888
ISSN
1097-0363
DOI
10.1002/fld.812
language
English
LU publication?
yes
id
5445c6c5-3b44-46c3-b16e-bb290e3fa873 (old id 254874)
date added to LUP
2007-08-20 14:07:22
date last changed
2017-09-10 03:47:01
@article{5445c6c5-3b44-46c3-b16e-bb290e3fa873,
  abstract     = {Flows over two tandem cylinders were analysed using the newly developed collocated unstructured computational fluid dynamics (CUCFD) code, which is capable of handling complex geometries. A Reynolds number of 100, based on cylinder diameter, was used to ensure that the flow remained laminar. The validity of the code was tested through comparisons with benchmark solutions for flow in a lid-friven cavity and flow around a single cylinder. For the tandem cylinder flow, also mesh convergence was demonstrated, to within a couple of percent for the RMS lift coefficient. The mean and fluctuating lift and drag coefficients were recorded for centre-to-centre cylinder spacings between 2 and 10 diameters. A critical cylinder spacing was found between 3.75 and 4 diameters. The fluctuating forces jumped appreciably at the critical spacing. It was found that there exists only one reattachment and one separation point on the downstream cylinder for spacings greater than the critical spacing. The mean and the fluctuating surface pressure distributions were compared as a function of the cylinder spacing. The mean and the fluctuating pressures were significantly different between the upstream and the downstream cylinders. These pressures also differed with the cylinder spacing.},
  author       = {Sharman, Bruce and Lien, FS and Davidson, Lars and Norberg, Christoffer},
  issn         = {1097-0363},
  keyword      = {unstructured grid,two tandem circular cylinder,unsteady flows},
  language     = {eng},
  number       = {5},
  pages        = {423--447},
  publisher    = {John Wiley & Sons},
  series       = {International Journal for Numerical Methods in Fluids},
  title        = {Numerical predictions of low Reynolds number flows over two tandem circular cylinders},
  url          = {http://dx.doi.org/10.1002/fld.812},
  volume       = {47},
  year         = {2005},
}