Investigation of Confluent Boundary Layers in High-Lift Flows

Ying, Susan X.; Spaid, Frank W.; McGinley, Catherine B.; Rumsey, Christopher L.

doi:10.2514/2.2490

Cited by 39 publications

(7 citation statements)

References 26 publications

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“…Consider a three-term tensor representation given by b = 3 X n=1 n T (n) : (9) with the three-term tensor basis T (m) , T (1) = S; T (2) = SW ? WS; T (3) = S 2 ?…”

Section: Explicit Solutionmentioning

confidence: 99%

“…Preliminary comparisons of computed Reynolds shear stresses with experimentally measured values in the ap region indicate that some discrepancies exist. 2 Currently, it is uncertain whether the disagreement is due to the turbulence model itself, or whether other factors are to blame. In particular, note that the =R parameter (boundary layer thickness over radius of curvature) that de nes the turning of the ow over the ap can be on the order of 0.01 to 0.1, depending on the particular con guration and whether the main element wake is included in the determination of .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Turbulence model predictions of extra-strain rate effects in strongly-curved flows

Rumsey

Gatski

Morrison

1999

37th Aerospace Sciences Meeting and Exhibit

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The abilities of three types of turbulence models to accurately predict the e ects of curvature on ow in a U-duct are studied. An explicit algebraic stress model performs better than one-or two-equation linear eddy viscosity models, although it is necessary to fully account for the variation of the production-todissipation-rate ratio in the algebraic stress model formulation. None of the turbulence models fully captures the suppressed turbulence near the convex wall or enhanced turbulence near the concave wall. However, a full Reynolds stress model predicts the suppressed turbulence near the convex wall. Some of the underlying assumptions used in the development of algebraic stress models are investigated and compared with the computed ow eld from a full Reynolds stress model. Through this analysis, the assumption of Reynolds stress anisotropy equilibrium used in the algebraic stress model formulation is found to be suspect in regions of strong curvature.

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“…Consider a three-term tensor representation given by b = 3 X n=1 n T (n) : (9) with the three-term tensor basis T (m) , T (1) = S; T (2) = SW ? WS; T (3) = S 2 ?…”

Section: Explicit Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Turbulence model predictions of extra-strain rate effects in strongly-curved flows

Rumsey

Gatski

Morrison

1999

37th Aerospace Sciences Meeting and Exhibit

View full text Add to dashboard Cite

show abstract

“…Another limitation can occur due to bursting of the viscous wake from the slat or the main wing as it passes through the high pressure gradients developed by the flap. In this case, the boundary layers on each of the high-lift components may be attached, but the rapid spreading of the viscous wakes will limit the maximum lift that can be achieved [20]. An attempt to improve the flow over a high-lift system by addressing one of these limiting factors may improve the performance, but it will still be limited by the other factors.…”

Section: Multi-element Wing Sectionsmentioning

confidence: 99%

Flow Control Techniques for Transport Aircraft

Shmilovich

Yadlin

2011

AIAA Journal

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A set of flow control approaches have been recently investigated for improved aerodynamic performance in a range of transport aircraft applications. Active Flow Control concepts are employed for reducing operational hazards during airplane ground maneuvering, alleviating trailing wakes for higher air traffic efficiency and improving takeoff and landing performance. Computational Fluid Dynamics has been extensively used to gain insight into complex flows subject to various modes of actuation and to develop promising techniques of flow control. The use of numerical simulations is especially important in scenarios involving powered systems, intricate vortex structures, separated flows, and active flow control devices, where alternative testing is extremely expensive and often impractical.

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“…Computational techniques and models of turbulence have also been improved to enable satisfactory prediction. See, for example, Ying et al (1999).…”

Section: Slotted Airfoilsmentioning

confidence: 99%

Hundred years of the boundary layer — Some aspects

Tulapurkara

2005

Sadhana

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The concept of the boundary layer was proposed by Ludwig Prandtl in 1904. This concept has allowed prediction of skin friction drag, heat transfer from the wall and separation of the boundary layer, which in turn enables proper design of airplanes, ships, other vehicles and equipment through/around which fluid flow takes place. The centenary of the proposal by Prandtl is being celebrated in various ways. This article is an attempt at presenting some of the developments in boundary layers. The article begins with a brief description of Prandtl's work. Subsequent sections deal with (a) a brief account of his 1904 paper, (b) some aspects of developments in boundary layer research and applications, (c) discussion of a few contributions from India in the area of boundary layers, and concluding remarks.

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Investigation of Confluent Boundary Layers in High-Lift Flows

Cited by 39 publications

References 26 publications

Turbulence model predictions of extra-strain rate effects in strongly-curved flows

Turbulence model predictions of extra-strain rate effects in strongly-curved flows

Flow Control Techniques for Transport Aircraft

Hundred years of the boundary layer — Some aspects

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