Experimental Evaluation of Pressure-Strain Models in Complex 3-D Turbulent Flow Near a Wing/Body Junction.
Abstract
Comparisons of experimentally-extracted pressure/rate-of-strain values were made to theoretical pressure-strain models for several locations of a wing-body function flow. The experimental pressure/rate-of-strain results were calculated from data obtained with a LDV technique. The data consist of profiles of mean velocity and higher order moments including quadruple products in a two-dimensional turbulent boundary layer (2DTBL), a strongly skewed three-dimensional turbulent boundary layer (3DTBL) in the vicinity of a 3-D separation line; and around the center of the horse-shoe vortex that forms around the wing. Terms in the transport equations for the Reynolds' stresses and the turbulent kinetic energy are also presented here. Several linear and non-linear pressure/rate-of-strain models are tested using the measured quantities as input to the models. The tested models are the Launder-Reece-Rodi (1975), Gibson-Launder (1978), Oberlack-Feters (1993), Fu-Launder-Tselepidakis (1987) (2 models), Shih-Lumley/Choi-Lumley (1985, 1984), and Speziale-Sarkar-Gataki (1991). The measurements were carried out in the Virginia Tech Boundary Layer Tunnel, at nominal air speed of 27.5 m/s around a NACA 0020 tailed and 3:2 elliptical nosed wing shape. Near-wall correction effects on the theoretical pressure/rate-of-strain models; effect of approximation for the pressure diffusion, the anisotropic dissipation approximation as well as isotropic dissipation approximation on the experimental pressure-strain data are examined. The results are compared to previous Direct Numerical Simulation data qualitatively. Data show that the pressure-diffusion approximation by Lumley (1978) is an important term in the V2, UV, and VW stress budgets.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1996
- Accession Number
- ADA307116
Entities
People
- M. S. Oelcmer
- R. L. Simpson
Organizations
- Virginia Tech