Control of cylinder wake flow and noise through a downstream porous treatment
Control of cylinder wake flow and noise through a downstream porous treatment
Various passive and active methods have been developed to control flow separation from bluff bodies. However, these methods require adjusting features of the solid surface, such as modifying its geometry or porosity, or applying external force or momentum. This paper develops an off-body-based method, without adjusting any features of the solid surface, for controlling the unsteady flow separation by fixing porous materials downstream of bluff bodies. Numerical study on flow past a circular cylinder at a subcritical Reynolds number is performed, and the result indicates that the added downstream porous material changes flow in the wake and re-laminarizes the turbulent flow around the curved cylinder surface, reducing the wall pressure fluctuation around the cylinder. therefore, the associated aerodynamic noise is reduced greatly.
Open-cell metal foam, flow separation, flow control, aerodynamic noise
233-243
Xu, Chen
744a2cb6-5baa-4fd9-9999-3f93001bb414
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
May 2019
Xu, Chen
744a2cb6-5baa-4fd9-9999-3f93001bb414
Mao, Yijun
3012974a-d258-4a40-8461-b4c41b9cf85c
Hu, Zhiwei
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Xu, Chen, Mao, Yijun and Hu, Zhiwei
(2019)
Control of cylinder wake flow and noise through a downstream porous treatment.
Aerospace Science and Technology, 88, .
(doi:10.1016/j.ast.2019.03.027).
Abstract
Various passive and active methods have been developed to control flow separation from bluff bodies. However, these methods require adjusting features of the solid surface, such as modifying its geometry or porosity, or applying external force or momentum. This paper develops an off-body-based method, without adjusting any features of the solid surface, for controlling the unsteady flow separation by fixing porous materials downstream of bluff bodies. Numerical study on flow past a circular cylinder at a subcritical Reynolds number is performed, and the result indicates that the added downstream porous material changes flow in the wake and re-laminarizes the turbulent flow around the curved cylinder surface, reducing the wall pressure fluctuation around the cylinder. therefore, the associated aerodynamic noise is reduced greatly.
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Accepted/In Press date: 11 March 2019
e-pub ahead of print date: 14 March 2019
Published date: May 2019
Keywords:
Open-cell metal foam, flow separation, flow control, aerodynamic noise
Identifiers
Local EPrints ID: 429575
URI: http://eprints.soton.ac.uk/id/eprint/429575
ISSN: 1270-9638
PURE UUID: 443eef1b-bf85-4aa7-a18c-d8cf40c32e9e
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Date deposited: 29 Mar 2019 17:30
Last modified: 16 Mar 2024 07:42
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Author:
Chen Xu
Author:
Yijun Mao
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