Relating Pressure Field and Vortex Shedding Suppression for a Square Cylinder in the Vicinity of a Solid Wall.
Haidn, O.J. and Bailey, S.C.C. and Martinuzzi, R.J. (1999) Relating Pressure Field and Vortex Shedding Suppression for a Square Cylinder in the Vicinity of a Solid Wall. In: Turbulence and Shear Flow - 1, pp. 1039-1044. 1st Turbulence and Shear Flow Phenomena (TSFP), Santa Barbara, CA, Sept. 12-15, 1999. ISBN 1-56700-135-1.
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Surface pressure and wake velocity field fluctuations are investigated for a square cylinder mounted in the vicinity of a solid wall as functions of the boundary layer thickness and cylinder-to-wall gap heights for Reynolds numers between 20000 and 40000. The study focuses on the suppression of vortex shedding occurring around critical gap heights. Mean data are combined to identify three distinct flow regimes. Time and frequency analyses show that at large gap heights periodic vortex shedding is perturbed by underlying large-scale structures leading to phase jitter and long-term loss of correlation. For small gaps, there is no evidence of periodic motion. For intermediate gap heights, there is a gradual loss of correlation between the pressure field on the top and lower cylinder surfaces, which leads to periods of sinusoidal fluctuations interspersed with incoherent motion in the wake. It is found that the Reynolds number influence is negligible and that an increase in the boundary layer thickness results in a reduction of the critical gap height. Stability considerations suggest that a stable vortex street can only exist for a certain range of the top shear layer to bottom shear layer circulation ratio.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Relating Pressure Field and Vortex Shedding Suppression for a Square Cylinder in the Vicinity of a Solid Wall.|
|Journal or Publication Title:||Turbulence and Shear Flow - 1|
|Page Range:||pp. 1039-1044|
|Keywords:||Free Shear Layer, Vortex Shedding, Flow around sqare Cylinder|
|Event Title:||1st Turbulence and Shear Flow Phenomena (TSFP), Santa Barbara, CA, Sept. 12-15, 1999|
|Organizer:||University of California, Department of Chemical Engineering, Santa Barbara|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W RP - Raumtransport|
|DLR - Research area:||Space|
|DLR - Program:||W RP - Raumtransport|
|DLR - Research theme (Project):||E -- no assignement|
|Institutes and Institutions:||Institute of Space Propulsion|
|Deposited By:||Monika Lohmiller|
|Deposited On:||16 Sep 2005|
|Last Modified:||06 Jan 2010 13:40|
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