Near-wall behavior of separated and reattaching flows

Devenport, William J.; Sutton, E. P.

doi:10.2514/3.10541

Cited by 46 publications

(10 citation statements)

References 13 publications

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“…This fact, also noted by other workers studying this type of flow (Westphal et al 1985, Castro andHaque 1987, for example), may indicate that laminar shear stress #aU/aY is important in the backflow. This possibility, and the structure of the backflow in general, is investigated and discussed in detail by Devenport and Sutton (1991).…”

Section: Wall Pressure and Skin-friction Distributionsmentioning

confidence: 99%

An experimental study of two flows through an axisymmetric sudden expansion

Devenport

Sutton

1993

Experiments in Fluids

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Two turbulent separated and reattaching flows produced by a sudden expansion in a pipe have been studied. The first was produced by a simple axisymmetric sudden enlargement from a nozzle of diameter 80 mm to a pipe of diameter 150 mm. The second was the flow at the same enlargement with the addition of a centerbody 90 mm downstream of the nozzle exit. Detailed measurements of velocity and skin friction (made primarily using pulsed wires) and of wall static pressure are presented. Without the centerbody the flow structure is similar to that observed in other sudden pipe expansions and over backward-facing steps. A turbulent free shear layer, bearing some similarity to that of a round jet, grows from separation and then reattaches to the pipe wall downstream. Reattachment is a comparatively gradual process, the shear layer approaching the wall at a glancing angle. The introduction of the centerbody causes the shear layer to curve towards the wall and reattach at a much steeper angle. Reattachment is much more rapid; gradients of skin friction and pressure along the wall are many times those without the centerbody. The high curvature of the shear layer strongly influences its turbulent structure, locally suppressing turbulence levels and reducing its growth rate.

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Section: Wall Pressure and Skin-friction Distributionsmentioning

confidence: 99%

An experimental study of two flows through an axisymmetric sudden expansion

Devenport

Sutton

1993

Experiments in Fluids

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“…The near wall behavior of two separated and reattaching flows formed by a sudden expansion in a pipe was studied experimentally by Davenport (1991). It was found the near wall flow in the separated flow was very different from a normal attached turbulent boundary layer flow.…”

Section: Experimental Studies On Separation Flowmentioning

confidence: 99%

A study on air flow and odor emission rate from a simplified manure storage tank

Liu

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“…In compressible flows, however, the inner coordinates are traditionally based on (i) the wall shear stress and on (ii) the wall heat flux. When moving to more complex flow situations with streamwise pressure gradient these well known laws of the wall are no more a valid description of the flow profile in the vicinity of the wall [6][7][8][9]. If e.g.…”

Section: Analytical Law Of the Wall And Near-wall Scalingmentioning

confidence: 99%

Near-wall scaling for incompressible and compressible flows

Peller

Manhart

Boiarciuc³

et al. 2007

ESAIM: Proc.

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Abstract. The paper presents near-wall scaling in incompressible and compressible flows. It concentrates on flows with streamwise pressure gradients which render traditional scaling inapplicable. For incompressible flows a scaling for the velocity profiles is introduced based on both the friction velocity and the pressure gradient. For compressible flows a scaling is developed for the velocity and the temperature. This scaling is based on wall friction, pressure gradient and wall heat flux. We define two new parameters α and β where α defines a measure for the ratio between wall friction and pressure gradient and β defines the ratio between wall heat flux and pressure gradient. For zero pressure gradient flows the traditional scaling is recovered. A priori tests are performed by means of Direct Numerical Simulations (DNS). The compressible scaling is analyzed on channel flow with non-adiabatic walls and adverse pressure gradient. The incompressible scaling is analyzed on channel flow with periodic hill constrictions. Finally a wall model based on the new scaling is tested a posteriori by means of Large Eddy Simulation (LES).

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Near-wall behavior of separated and reattaching flows

Cited by 46 publications

References 13 publications

An experimental study of two flows through an axisymmetric sudden expansion

An experimental study of two flows through an axisymmetric sudden expansion

A study on air flow and odor emission rate from a simplified manure storage tank

Near-wall scaling for incompressible and compressible flows

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