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Detached-eddy simulation of flow around a circular cylinder in ground effect

Detached-eddy simulation of flow around a circular cylinder in ground effect
Detached-eddy simulation of flow around a circular cylinder in ground effect
In this study we performed a detached-eddy simulation (DES) of flow around a circular cylinder placed near and parallel to a moving ground, on which no boundary layer developed to interfere with the cylinder. The results were compared with experiments previously reported by the authors, and also with two-dimensional unsteady RANS computations. The DES correctly predicted the cessation of the Kármán-type vortex shedding behind the cylinder, whereas the unsteady RANS also predicted it but at a much smaller ‘gap ratio’ (i.e. the ratio of the gap between the cylinder and the ground, h, to the cylinder diameter d) compared with the experiments. Time-averaged force coefficients, separation angles and velocity profiles in the near wake region predicted by the DES were in good agreement with the experiments. The major features of instantaneous wake structures were well reproduced in both large- and small-gap regimes, and also in the intermediate-gap regime, where the DES predicted a temporary formation of a small dead-fluid zone behind the cylinder.
detached-eddy simulation, circular cylinder, ground effect
Nishino, Takafumi
dc3e5827-0bf7-431d-871b-b4bdeff169c1
Roberts, Graham T.
deaf59ac-e4ee-4fc2-accf-df0639d39368
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421
Nishino, Takafumi
dc3e5827-0bf7-431d-871b-b4bdeff169c1
Roberts, Graham T.
deaf59ac-e4ee-4fc2-accf-df0639d39368
Zhang, Xin
3056a795-80f7-4bbd-9c75-ecbc93085421

Nishino, Takafumi, Roberts, Graham T. and Zhang, Xin (2006) Detached-eddy simulation of flow around a circular cylinder in ground effect. 17th International Symposium on Transport Phenomena, Toyama, Japan. 04 - 08 Sep 2006. 6 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

In this study we performed a detached-eddy simulation (DES) of flow around a circular cylinder placed near and parallel to a moving ground, on which no boundary layer developed to interfere with the cylinder. The results were compared with experiments previously reported by the authors, and also with two-dimensional unsteady RANS computations. The DES correctly predicted the cessation of the Kármán-type vortex shedding behind the cylinder, whereas the unsteady RANS also predicted it but at a much smaller ‘gap ratio’ (i.e. the ratio of the gap between the cylinder and the ground, h, to the cylinder diameter d) compared with the experiments. Time-averaged force coefficients, separation angles and velocity profiles in the near wake region predicted by the DES were in good agreement with the experiments. The major features of instantaneous wake structures were well reproduced in both large- and small-gap regimes, and also in the intermediate-gap regime, where the DES predicted a temporary formation of a small dead-fluid zone behind the cylinder.

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More information

Published date: September 2006
Venue - Dates: 17th International Symposium on Transport Phenomena, Toyama, Japan, 2006-09-04 - 2006-09-08
Keywords: detached-eddy simulation, circular cylinder, ground effect
Organisations: Aerodynamics & Flight Mechanics

Identifiers

Local EPrints ID: 43654
URI: http://eprints.soton.ac.uk/id/eprint/43654
PURE UUID: a7bd1c0b-1b4b-49fa-8e49-8ba4d1af1aca

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Date deposited: 25 Jan 2007
Last modified: 15 Mar 2024 08:56

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Contributors

Author: Takafumi Nishino
Author: Xin Zhang

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