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Airfoil Validation Using Coupled Navier-Stokes and e*Transition Prediction Methods

Stock, H.W. (2002) Airfoil Validation Using Coupled Navier-Stokes and e*Transition Prediction Methods. Journal of Aircraft, 39 (1), pp. 51-58.

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Abstract

Navier-Stokes airfoil computations coupled to e* transition prediction are feasible, provided the limiting N factor is known beforehand. In the present study a procedure is outlined to validate free-transition airfoil experiments in wind tunnels for which the limiting N factor is not known a priori. The approach does not rely on mesh adaption procedures to obtain adequate laminar viscous layer data from Navier-Stokes computations for the stability analysis. To the contrary, the laminar viscous layer is computed by a boundary-layer method applying as input the pressure distribution from Navier-Stokes computations on initial meshes. Two measurement campaigns are validated: the NLF(1)-0416 laminar airfoil in the low-speed NASA Langley Low-Turbulence Pressure Tunnel LTPT and the NACA 64*A015 airfoil in the NASA Ames 12-Foot Pressure Tunnel. The free-transition measurements in both tunnels include pressure distributions and transition locations and, in supplement, for the NLF(1)-0416 laminar airfoil lift and drag measurements. The computational results document the validity of the present approach, the existence of a constant limiting N factor for a specific wind tunnel, and an excellent agreement with the experimental findings.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=2002,
Title:Airfoil Validation Using Coupled Navier-Stokes and e*Transition Prediction Methods
Authors:
AuthorsInstitution or Email of Authors
Stock, H.W.UNSPECIFIED
Date:2002
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:39
Page Range:pp. 51-58
Status:Published
Keywords:Navier-Stokes, e* Methode, Profile
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):L - Concepts & Integration
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: elib DLR-Beauftragter
Deposited On:31 Jan 2006
Last Modified:14 Jan 2010 18:56

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