Experimental investigation of flow separation over a step

Tani, Itirô

doi:10.1007/978-3-642-45885-9_31

Cited by 33 publications

(35 citation statements)

References 2 publications

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“…Quite independently, a second group of studies can be found which deal only with the pressure field and drag characteristics of this flow (Roshko 1955, Tani 1961, Fox 1964, Koenig 1978. To our knowledge no investigator has tried to fill the gap between the first and the second group of experiments.…”

Section: Statement Of the Problemmentioning

confidence: 99%

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Effect of Flow Oscillations on Cavity Drag and a Technique for Their Control.

Gharib¹,

Roshko²,

Sarohia³

1985

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Section: Statement Of the Problemmentioning

confidence: 99%

“…Such a definition for the shallow and deep cavities loses its meaning in the absence of the acoustic resonance in the cavity. Tani et al, (1961) Sketch 1 illustrates the physically significant parameters of the cavity flow.…”

mentioning

confidence: 99%

Effect of Flow Oscillations on Cavity Drag and a Technique for Their Control.

Gharib¹,

Roshko²,

Sarohia³

1985

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“…[1][2][3][4][5][6][7][8][9] One of its features is the complexity of turbulent structures. The flow just downstream of the step has a similar flow structure to the plainmixing layer.…”

mentioning

confidence: 99%

Behavior of Separated and Reattaching Flow Formed over a Backward Facing Step.

Rinoie

Shirai

Sunada

2002

Trans. Japan Soc. Aero. S Sci.

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Wind tunnel measurements were done for the separated and reattaching flow formed over a backward-facing step. Turbulent energy and turbulent normal stress balances were estimated from the measured data of mean velocities, Reynolds stresses, and turbulent triple products. The main objective of the experiments is to analyze the turbulent structure inside the reattaching shear layer, including the reverse flow, in detail. The results indicated different turbulent structures in three classified regions of the backward-facing step flow, first the dead air region, second the near wall region just upstream and downstream of the reattachment, and third the separated shear layer region. The second region is the one in which the transverse diffusion by turbulence in the turbulent energy balance equation plays an important role in comparison with other regions. In the reverse flow region just upstream of the reattachment included in the second region, the production term by shear stress, the transverse diffusion term by turbulence, and the advection term similarly help to balance the dissipation term.

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“…Most of these studies were conducted on two-dimensional rectangular slots normal to the flow direction [4] and [12]. In later studies, fully three-dimensional cavities with different geometries and approaching flow conditions have been examined.…”

Section: Cavity Flow Classificationsmentioning

confidence: 99%

“…Only a few researchers have used surface pressure distribution measurements to extract the aerodynamic forces [48]. Tani et al showed that open cavities have lower drag compared to the closed ones [12].…”

Section: Drag Of Cavitiesmentioning

confidence: 99%

Experimental and Numerical Study of Flow Structures Associated With Low Aspect Ratio Elliptical Cavities

Khadivi¹,

Savory

2013

Journal of Fluids Engineering

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The flow regimes associated with a 2:1 aspect ratio, elliptical planform cavity in a turbulent flat plate boundary layer have been systematically examined for various depth/width ratios (0.1 to 1.0) and yaw angles (0° to 90°), using a combination of wind tunnel experiments (involving Particle Image Velocimetry and helium bubble visualization) and Computational Fluid Dynamics (CFD) simulations (employing threedimensional steady calculations with the Reynolds Stress model turbulence closure).Satisfactory agreement has been found between the results using the two methods, indicating that the steady numerical simulations can be a cost-effective tool to predict the mean flow features.The flow has been found to be highly dependent on yaw angle and cavity depth. For each of the three broad flow categories specified according to yaw angle, which include the symmetric flow regime (yaw angle = 0°), the straight vortex regime (yaw angle = 90°) and the asymmetric flow regime (15° ≤ yaw angle ≤ 60°) different regimes are found to exist, depending on cavity depth. For each combination of yaw angle and depth, the flow has been analyzed through investigation of shear layer parameters, the three-dimensional vortex structure, pressure distribution and drag, wake flow, and vortex oscillations.While the elliptical cavity flows have been found to have some similarities with those of nominally two-dimensional and rectangular cavities, the three-dimensional effects due to the low aspect ratio and curvature of the walls give rise to features exclusive to low aspect ratio elliptical cavities, including formation of cellular structures at intermediate depths and unique vortex structures within and downstream of the cavity.The three-dimensional flow structure of the flow is most pronounced in the asymmetric regimes with large yaw angles (45° and 60°). The dominant feature in this regime is the formation of a trailing vortex that is associated with high drag and flow oscillations within the cavity.iv Keywords

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Experimental investigation of flow separation over a step

Cited by 33 publications

References 2 publications

Effect of Flow Oscillations on Cavity Drag and a Technique for Their Control.

Effect of Flow Oscillations on Cavity Drag and a Technique for Their Control.

Behavior of Separated and Reattaching Flow Formed over a Backward Facing Step.

Experimental and Numerical Study of Flow Structures Associated With Low Aspect Ratio Elliptical Cavities

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