Development of a complete model of turbulence revisited
Abstract
A comprehensive and critical review of closure approximations for two equation turbulence models has been made. Particular attention has focused upon the scale-determining 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: (1) conventional k-e and k-omega sq formulations generally are inaccurate for boundary layers in adverse pressure gradient; (2) using so-called wall functions tends to mask such models' shortcomings; and (3) there exists a more suitable choice of dependent variables which is far more accurate for adverse pressure gradient.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- December 1983
- Bibcode:
- 1983STIN...8421836W
- Keywords:
-
- Approximation;
- Closures;
- Equations Of Motion;
- Incompressible Flow;
- Prediction Analysis Techniques;
- Turbulence Models;
- Turbulent Boundary Layer;
- Incompressible Boundary Layer;
- Navier-Stokes Equation;
- Perturbation;
- Pressure Gradients;
- Turbulent Flow;
- Viscous Flow;
- Walls;
- Fluid Mechanics and Heat Transfer