Coherent structures
Abstract
In order to develop more quantitative measures of coherent structures that would have comparative value over a range of experiments, it is essential that such measures be independent of the observer. It is only through such a general framework that theories with a fundamental predictive value can be developed. The triple decomposition phi = barphi + phi(c) + phi(r) (where barphi is the mean, phi(c) is the coherent part, and phi(r) is the random part of any turbulent field phi) serves this purpose. The equations of motion for the mean and coherent flow fields, based on the triple decomposition, are presented and modeling methods for the timeaveraged and phaseaveraged Reynolds stress are discussed.
 Publication:

Studying Turbulence Using Numerical Simulation Databases
 Pub Date:
 December 1987
 Bibcode:
 1987stun.proc..329S
 Keywords:

 Computational Fluid Dynamics;
 Equations Of Motion;
 Flow Equations;
 Turbulent Flow;
 Coherence;
 Reynolds Stress;
 Fluid Mechanics and Heat Transfer