
Accession Number : ADA138145
Title : Development of a Complete Model of Turbulence Revisited.
Descriptive Note : Technical rept.,
Corporate Author : DCW INDUSTRIES INC LA CANADA CA
Personal Author(s) : Wilcox,D C
PDF Url : ADA138145
Report Date : Dec 1983
Pagination or Media Count : 60
Abstract : A comprehensive and critical review of closure approximations for two equation turbulence models has been made. Particular attention has focused upon the scaledetermining equation in an attempt to find the optimum choice of dependent variable and closure approximations. Using a combination of singular perturbation methods and numerical computations, this report demonstrates: (a) conventional ke and komega sq formulations generally are inaccurate for boundary layers in adverse pressure gradient; (b) using socalled wall functions tends to mask such models' shortcomings; and (c) there exists a more suitable choice of dependent variables which is far more accurate for adverse pressure gradient. (Author)
Descriptors : *Turbulent flow, *Mathematical models, *Boundary layer, *Equations of motion, Perturbations, Approximation(Mathematics), Scale, Pressure gradients, Variables, Viscous flow, Walls, Turbulence, Mathematical prediction, Incompressible flow, Navier Stokes equations, Coefficients
Subject Categories : Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE