A dual assault upon turbulence
Abstract
All known calculation methods incorporate some sort of turbulence model to reduce the infinite hierarchy of equations, under Reynolds' averaging, to a finite set. All such models suffer from a certain ad hoc nature. A dual structure model was developed wherein the turbulence field is, somewhat arbitrarily, decomposed into large eddies which presumably are dominant contributors to the Reynolds' stress and small eddies which feed on the large eddies as these, in turn feed upon the average flow to gain their energy. These concepts have been developed into a dual approach, one extractive and the other predictive as outlined below.
 Publication:

In NASA. Ames Res. Center Future Computer Requirements for Computational Aerodynamics p 260266 (SEE N7819778 1059
 Pub Date:
 February 1978
 Bibcode:
 1978fcrc.nasa..260P
 Keywords:

 Mathematical Models;
 Turbulent Flow;
 Boundary Layer Flow;
 Eigenvalues;
 NavierStokes Equation;
 Reynolds Stress;
 Turbulence Models;
 Fluid Mechanics and Heat Transfer