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Dynamic interaction of fixed dual spheres for several configurations and inflow conditions

Jadoon, Asim LU ; Prahl, L. and Revstedt, Johan LU (2010) In European Journal of Mechanics. B, Fluids 29(1). p.43-52
Abstract
The changes in force characteristics as well as the shedding patterns for various dual sphere configurations are studied. The Reynolds numbers considered are 300, 600 and two different inflow conditions are used: steady and pulsating. The sphere formations are defined by the separation distance D-0 between the spheres and the angle between the line connecting the centres of the spheres and the main flow direction, gamma. The position of one of the spheres is varied in the range 0 degrees-90 degrees using a 15 degrees increment. Two separation distances are studied; 1.5D and 3D. The method used for the simulations is the Volume of Solid (VOS) approach, a method based on Volume of Fluid (VOF). A major conclusion from this work is that the... (More)
The changes in force characteristics as well as the shedding patterns for various dual sphere configurations are studied. The Reynolds numbers considered are 300, 600 and two different inflow conditions are used: steady and pulsating. The sphere formations are defined by the separation distance D-0 between the spheres and the angle between the line connecting the centres of the spheres and the main flow direction, gamma. The position of one of the spheres is varied in the range 0 degrees-90 degrees using a 15 degrees increment. Two separation distances are studied; 1.5D and 3D. The method used for the simulations is the Volume of Solid (VOS) approach, a method based on Volume of Fluid (VOF). A major conclusion from this work is that the sphere interaction alters the wake dynamics by obstructing the vortex shedding (generating a steady wake or a wake with lower Strouhal number) and by changing the direction of the lift force so that it in most cases is directed in the plane containing the sphere centres. The results also show that changing the inflow condition gives the same relative change in drag and lift as for a single sphere. The drag is substantially reduced by placing the sphere downstream in a tandem arrangement and slightly increased in a side-by-side arrangement. However, the effect is decreased by increasing separation distance and increasing Reynolds number. (C) 2009 Elsevier Masson SAS. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Wake structures, Particle interactions, Volume of Solid (VOS)
in
European Journal of Mechanics. B, Fluids
volume
29
issue
1
pages
43 - 52
publisher
Gauthier-Villars
external identifiers
  • wos:000272928900005
  • scopus:71649113595
ISSN
1873-7390
DOI
10.1016/j.euromechflu.2009.09.003
language
English
LU publication?
yes
id
f69c8128-ae35-432b-ac49-2c0ea7355fc1 (old id 1535490)
date added to LUP
2010-01-27 09:21:49
date last changed
2018-05-29 10:22:36
@article{f69c8128-ae35-432b-ac49-2c0ea7355fc1,
  abstract     = {The changes in force characteristics as well as the shedding patterns for various dual sphere configurations are studied. The Reynolds numbers considered are 300, 600 and two different inflow conditions are used: steady and pulsating. The sphere formations are defined by the separation distance D-0 between the spheres and the angle between the line connecting the centres of the spheres and the main flow direction, gamma. The position of one of the spheres is varied in the range 0 degrees-90 degrees using a 15 degrees increment. Two separation distances are studied; 1.5D and 3D. The method used for the simulations is the Volume of Solid (VOS) approach, a method based on Volume of Fluid (VOF). A major conclusion from this work is that the sphere interaction alters the wake dynamics by obstructing the vortex shedding (generating a steady wake or a wake with lower Strouhal number) and by changing the direction of the lift force so that it in most cases is directed in the plane containing the sphere centres. The results also show that changing the inflow condition gives the same relative change in drag and lift as for a single sphere. The drag is substantially reduced by placing the sphere downstream in a tandem arrangement and slightly increased in a side-by-side arrangement. However, the effect is decreased by increasing separation distance and increasing Reynolds number. (C) 2009 Elsevier Masson SAS. All rights reserved.},
  author       = {Jadoon, Asim and Prahl, L. and Revstedt, Johan},
  issn         = {1873-7390},
  keyword      = {Wake structures,Particle interactions,Volume of Solid (VOS)},
  language     = {eng},
  number       = {1},
  pages        = {43--52},
  publisher    = {Gauthier-Villars},
  series       = {European Journal of Mechanics. B, Fluids},
  title        = {Dynamic interaction of fixed dual spheres for several configurations and inflow conditions},
  url          = {http://dx.doi.org/10.1016/j.euromechflu.2009.09.003},
  volume       = {29},
  year         = {2010},
}