
Accession Number : ADA307116
Title : Experimental Evaluation of PressureStrain Models in Complex 3D Turbulent Flow Near a Wing/Body Junction.
Descriptive Note : Technical rept. 1 Jan 9431 Dec 95,
Corporate Author : VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE AND OCE AN ENGINEERING
Personal Author(s) : Oelcmer, M. S. ; Simpson, R. L.
PDF Url : ADA307116
Report Date : FEB 1996
Pagination or Media Count : 158
Abstract : Comparisons of experimentallyextracted pressure/rateofstrain values were made to theoretical pressurestrain models for several locations of a wingbody function flow. The experimental pressure/rateofstrain 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 twodimensional turbulent boundary layer (2DTBL), a strongly skewed threedimensional turbulent boundary layer (3DTBL) in the vicinity of a 3D separation line; and around the center of the horseshoe 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 nonlinear pressure/rateofstrain models are tested using the measured quantities as input to the models. The tested models are the LaunderReeceRodi (1975), GibsonLaunder (1978), OberlackFeters (1993), FuLaunderTselepidakis (1987) (2 models), ShihLumley/ChoiLumley (1985, 1984), and SpezialeSarkarGataki (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. Nearwall correction effects on the theoretical pressure/rateofstrain models; effect of approximation for the pressure diffusion, the anisotropic dissipation approximation as well as isotropic dissipation approximation on the experimental pressurestrain data are examined. The results are compared to previous Direct Numerical Simulation data qualitatively. Data show that the pressurediffusion approximation by Lumley (1978) is an important term in the V2, UV, and VW stress budgets.
Descriptors : *STRESS STRAIN RELATIONS, *TURBULENT FLOW, *THREE DIMENSIONAL FLOW, VELOCITY, PRESSURE GRADIENTS, MATHEMATICAL MODELS, STRESS ANALYSIS, DISSIPATION, TURBULENCE, TURBULENT BOUNDARY LAYER, MOMENTS, VORTICES, COMPUTATIONAL FLUID DYNAMICS, PRESSURE MEASUREMENT, FLOW FIELDS, APPROXIMATION(MATHEMATICS), SHEAR STRESSES, KINETIC ENERGY, VECTOR ANALYSIS, TWO DIMENSIONAL FLOW, NAVIER STOKES EQUATIONS, VISCOSITY, FLOW SEPARATION, STATIC PRESSURE, WING BODY CONFIGURATIONS, PRESSURE DISTRIBUTION, REYNOLDS NUMBER, LASER VELOCIMETERS, MOMENTUM TRANSFER, TURBULENT DIFFUSION.
Subject Categories : Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE