Prediction of separating turbulent boundary layers including regions of reversed flow
Abstract
The results of a research program to develop and evaluate improved prediction methods for turbulent separating flows are summarized. The predictions of several turbulence models have been compared with experimental data for flows containing regions of recirculation using an inverse finitedifference method to solve the boundary layer equations. A new turbulence model which employs a onedimensional transport equation for the outerlayer length scale was seen to provide the best agreement with the experimental data beyond separation. A viscousinviscid interaction calculation procedure was developed to predict airfoil flows containing leading edge or midchord separation bubbles. The procedure utilized the inverse finitedifference method to predict the viscous flow and a small disturbance Cauchy integral formulation for the inviscid flow. Three models for laminarturbulent transition were evaluated. Generally good agreement between predictions of the best model and measurements was observed in the several comparisons made. Some early results from a finitedifference scheme to solve the partially parabolized NavierStokes equations in primitive variables were also reported. The method was developed to predict viscous flows in which normal pressure gradients cannot be neglected.
 Publication:

Final Report Iowa State Univ. of Science and Technology
 Pub Date:
 February 1980
 Bibcode:
 1980isu..reptQ....P
 Keywords:

 Aerodynamic Configurations;
 Boundary Layer Separation;
 Turbulent Boundary Layer;
 Finite Difference Theory;
 Flow Distribution;
 Incompressible Flow;
 Turbulence Models;
 Two Dimensional Flow;
 Fluid Mechanics and Heat Transfer