Research Papers: Multiphase Flows

The Interaction of Porous Material Coating With the Near Wake of Bluff Body

[+] Author and Article Information
Jinjia Wei

e-mail: jjwei@mail.xjtu.edu.cn

Zhiguo Qu

State Key Laboratory of Multiphase
Flow in Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 9, 2012; final manuscript received November 19, 2013; published online December 12, 2013. Assoc. Editor: Mark F. Tachie.

J. Fluids Eng 136(2), 021302 (Dec 12, 2013) (8 pages) Paper No: FE-12-1378; doi: 10.1115/1.4026071 History: Received August 09, 2012; Revised November 19, 2013

The flow around a circular cylinder with porous material coating (PMC) is numerically investigated based on unsteady Reynolds-averaged Navier–Stokes (URANS) method at subcritical Reynolds number. The results are compared with some available results in the open literature. The interaction of PMC with the near wake of a circular cylinder such as streamline, vorticity field, and shear stress are studied in detail. Subsequently, the fluctuation forces and velocity distribution in the boundary layer are analyzed and the effect of various thicknesses of PMC is investigated. The numerical results reveal that PMC has prominently modified the flow characteristic of the near wake of circular cylinder and significantly mitigated the fluctuations of aerodynamic forces from two aspects of frequency and amplitude. It means that the vortex shedding from the bluff body is suppressed. It also is found that the thickness of the PMC is a sensitive parameter to the aerodynamic forces and velocity distribution in the boundary layer. Furthermore, the mean drag can be reduced to a certain extent when the thickness is appropriate. It is expected that the modification of flow characteristic and aerodynamic forces is closely related to the flow-induced noise reduction. Those results will be helpful to understand the mechanism of flow control on bluff body flow by using porous material coating and accumulate meaningful information for further industrial application.

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Fig. 3

Time-mean cross-flow velocity profiles: (a) smooth cylinder; (b) PMC cylinder

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Fig. 2

Computational domain and grid topology: (a) global region; (b) near field

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Fig. 10

Time history of lift coefficient

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Fig. 11

Time history of drag coefficient

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Fig. 1

Schematic of flow around a circular cylinder with porous material coating

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Fig. 5

Time-mean streamlines: (a) smooth cylinder; (b) PMC cylinder (dashed line denotes porous surface)

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Fig. 4

Wake velocity fluctuation profiles: (a) smooth cylinder; (b) PMC cylinder

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Fig. 6

Contours of time-mean spanwise vorticity (ωzD/U): (a) smooth cylinder; (b) PMC cylinder (dashed line denotes porous surface)

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Fig. 7

Instantaneous spanwise vorticity field (ωzD/U∞): (a) smooth cylinder in experiment [12]; (b) PMC cylinder in experiment [12]. (Copyright The Japan Society of Fluid Mechanics, DOI:10.1088/0169-5983/42/1/015004. Reproduced by permission of IOP Publishing. All rights reserved); (c) smooth cylinder in present simulation; (d) PMC cylinder in present simulation (dashed line denotes porous surface)

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Fig. 8

The resolved shear stress (u'v'¯/U∞2): (a) smooth cylinder; (b) PMC cylinder (dashed line denotes porous surface)

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Fig. 9

Distributions of (a) time-mean nondimensional velocity u/U and (b) velocity gradient (du/dy)/(U/D) along the vertical symmetric line of the cylinder



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