Wave models for turbulent free shear flows
Abstract
New predictive closure models for turbulent free shear flows are presented. They are based on an instability wave description of the dominant large scale structures in these flows using a quasilinear theory. Three model were developed to study the structural dynamics of turbulent motions of different scales in free shear flows. The local characteristics of the large scale motions are described using linear theory. Their amplitude is determined from an energy integral analysis. The models were applied to the study of an incompressible free mixing layer. In all cases, predictions are made for the development of the mean flow field. In the last model, predictions of the time dependent motion of the large scale structure of the mixing region are made. The predictions show good agreement with experimental observations.
 Publication:

Computational Fluid Dynamics Symposium on Aeropropulsion
 Pub Date:
 January 1991
 Bibcode:
 1991cfd..nasa..457L
 Keywords:

 Flow Stability;
 Free Flow;
 Mathematical Models;
 Shear Flow;
 Turbulence Models;
 Wave Propagation;
 Computational Fluid Dynamics;
 Dynamic Response;
 Flow Distribution;
 Incompressible Flow;
 Mixing Layers (Fluids);
 Predictions;
 Time Dependence;
 Turbulent Flow;
 Fluid Mechanics and Heat Transfer