Transpired turbulent boundary layers: a general strategy for RANS turbulence models

Chedevergne, F.; Marchenay, Y.

doi:10.1080/14685248.2019.1702198

Cited by 6 publications

(4 citation statements)

References 31 publications

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“…While applicable to both blowing and suction, it relies on non-local boundary layer properties such as the local mean velocity at the edge of the boundary layer. Chedevergne et al [35] verify that the difference compared to the standard SST-formulation without correction for transpiration is not significant for most applications. In the present work, we have verified that blowing cases treated with Wilcox [34] formulation (Eq.…”

Section: A Boundary Conditionsmentioning

confidence: 99%

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Investigation of Blowing and Suction for Turbulent Flow Control on Airfoils

Fahland¹,

Stroh²,

Atzori³

et al. 2021

AIAA Journal

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An extensive parametric study of turbulent boundary layer control on airfoils via uniform blowing or suction is presented. The control is applied on either suction or pressure side of several 4-digit NACA-series airfoils. The considered parameter variations include angle of attack, Reynolds number, control intensity, airfoil camber and airfoil thickness. Two comprehensive metrics, designed to account for the additional energy required by the control, are introduced to evaluate the net aerodynamic performance enhancements. The study confirms previous findings for suction side boundary layer control and demonstrates the interesting potential

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Section: A Boundary Conditionsmentioning

confidence: 99%

“…where + BLC is the blowing velocity. Chedevergne et al [35] propose an alternative approach based on the modifications of the SST-model constants and . While applicable to both blowing and suction, it relies on non-local boundary layer properties such as the local mean velocity at the edge of the boundary layer.…”

Section: A Boundary Conditionsmentioning

confidence: 99%

Investigation of Blowing and Suction for Turbulent Flow Control on Airfoils

Fahland¹,

Stroh²,

Atzori³

et al. 2021

AIAA Journal

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“…( 26)) must be removed from the apparent velocity shift ∆u + | app . The advantage of k − ω based models is that the predicted velocity profiles u * * + for blowing configurations tend to collapse in a unique logarithmic law as emphasized by Chedevergne and Marchenay 30 . In other words, the predicted velocity profiles do not exhibit additional velocity shifts caused by blowing.…”

Section: A Combined Effects Of Roughness and Blowingmentioning

confidence: 99%

Modeling of combined effects of surface roughness and blowing for Reynolds-averaged Navier–Stokes turbulence models

2021

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A new modeling strategy adapted to Reynolds-Averaged Navier-Stokes (RANS) turbulence models is proposed to predict combined effects of roughness and blowing boundary conditions. First, an analysis of experimental data is presented, leading to a specific description of the velocity profile in the logarithmic region of transpired turbulent boundary layers over rough walls. This analysis points out the deficiencies of existing roughness corrections to predict the effect of blowing in the presence of surface roughness. Indeed, these corrections tend to underestimate skin friction coefficients and Stanton numbers with addition of blowing. The failure of existing models derives from an inaccurate estimation of the velocity shift of the logarithmic law given by roughness corrections. Concretely, roughness corrections underestimate the apparent velocity shift of the logarithmic law with blowing. To recover the expected law of the wall, an additional contribution on the velocity shift, characterizing blowing/roughness interactions, is integrated to standard roughness corrections. To that end, a modification of the equivalent sand grain height, adapted to k − ω based turbulence models, is proposed to take blowing effects into account. Furthermore, an extension of Aupoix's thermal correction [B. Aupoix, International Journal of Heat and Fluid Flow 56, 160 (2015)] to blowing is presented to predict combined thermal effects of roughness and blowing. The assessment of the proposed corrections is performed using k − ω Shear Stress Transport (SST) model on a large set of experimental data and proves the relevance of the strategy for incompressible and compressible turbulent boundary layers.

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“…The presence of transpiration within boundary layers on solid surfaces has attracted significant interest in various technical applications. In this context, "transpiration" encompasses both suction, where the flow direction normal to the surface is inward, and blowing, where the flow is directed outward from the surface [6]. Transpiration has been extensively studied as a means to enhance surface cooling or achieve drag reduction (blowing), control boundary layer separation and delay laminar-to-turbulent transition (suction) in aeronautical applications [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Temperature Distribution in a Laminar Boundary Layer over a Heated Flat Plate with Localized Transverse Cold Air Injections

Siddiqui,

Melaibari,

Butt

2023

Energies

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This study presents an experimental investigation focused on the interaction between a transverse injection of cold air (blowing) and the boundary layer over a heated flat plate. The flat plate was equipped with a cylindrical coil heater positioned at its center along the flow direction. The constant heat flux was maintained using a variable resistance potentiometer. The flat plate with the heater was mounted inside a subsonic wind tunnel to sustain a constant laminar air flow. The primary objective of this research was to examine the effects of cold air injections through localized holes in the flat plate near the trailing edge on the thermal boundary layer thickness δt(x,Rex,Pr). The thermal boundary layer thickness was measured using K-type thermocouples and PT-100 RTD sensors, which are made to move precise, small distances using a specially constructed traversing mechanism. Cold air was injected using purposefully fabricated metal capillary tubes force-fitted into holes through the hot flat plate. The metal tubes were thermally insulated using class-F insulation, which is used in electric motor windings. The presented work focused on a fixed free-stream velocity and a fixed cold-injection velocity less than the free-stream velocity but for two-variable heat fluxes. The results show that the thermal boundary layer thickness generally increased due to the secondary cold flow.

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Transpired turbulent boundary layers: a general strategy for RANS turbulence models

Cited by 6 publications

References 31 publications

Investigation of Blowing and Suction for Turbulent Flow Control on Airfoils

Investigation of Blowing and Suction for Turbulent Flow Control on Airfoils

Modeling of combined effects of surface roughness and blowing for Reynolds-averaged Navier–Stokes turbulence models

Experimental Investigation of Temperature Distribution in a Laminar Boundary Layer over a Heated Flat Plate with Localized Transverse Cold Air Injections

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