The drag of three-dimensional rectangular cavities

Savory, Eric; Toy, N.; Disimile, Peter J.; DiMicco, Russell

doi:10.1007/bf00850565

Cited by 17 publications

(10 citation statements)

References 14 publications

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“…Drag variations due to changes in cavity depth and yaw angle, found in the present study, are similar in trend to those reported in previous studies involving elliptical cavities and rectangular cavities [3], [5], [48], [49], and [58].…”

Section: Summary Of the Findingssupporting

confidence: 92%

“…These results are compared with the previously published drag data for elliptical and rectangular cavities with W/D = 2 at 90° yaw angle [5], [48] and [58], as well circular cavities [52] and [53].…”

Section: Drag Characteristicsmentioning

confidence: 60%

“…However, for the cavity with an aspect ratio of 2:1, the results reported by Czech do not show any cellular structure in the cavity vortex. Similarly, in the study by Savory et al [48], no particular indication of a cellular structure in the cavity vortex was found, for a rectangular cavity with an aspect ratio of 2:1 exposed to a turbulent upstream boundary layer. For the cavity with a 2:1 elliptical planform, existence of the cellular structure can also be observed in the results of the experiments by Hering [58].…”

Section: Deep Cavity (H/d = 10)mentioning

confidence: 61%

“…At this yaw angle, the vortex, which is generally aligned with the major axis of the cavity at lower yaw angles, re-aligns with the minor axis, similar to the case of the cavity at 90° yaw angle. This transition is not observed for cavities with smaller depths, however, Savory et al [48] have mentioned the possibility of a similar transition based on their observations of the flow in a rectangular cavity with an aspect ratio of 2:1.…”

Section: Summary Of Findings For the Asymmetric Flow Regimesmentioning

confidence: 95%

“…Most of these drag data have been derived from force balance measurements which can not be used to specify the cavity flow regimes. 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%

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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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Section: Summary Of the Findingssupporting

confidence: 92%