Intermittency of coherent structures  An approach using statistical theories of isotropic turbulence
Abstract
Some mechanisms based on statistical theories of turbulence are proposed which make it possible to gain a better understanding of the intermittent behavior of coherent structures in turbulent flows. It is shown that the dynamics of these flows is characterized by a competition between the organizing action of external forces of instability mechanisms tending to create coherent structures and the exposive growth of smallscale threedimensionality tending to destroy them. Thus, the coherent structures are intermittently destroyed by threedimensional turbulence and then reformed due to instability. The theory, although developed for the turbulent free shear layer, can be extended to rotating turbulence.
 Publication:

Turbulence and Chaotic Phenomena in Fluids
 Pub Date:
 1984
 Bibcode:
 1984tcpf.proc..339L
 Keywords:

 Computational Fluid Dynamics;
 Intermittency;
 Isotropic Turbulence;
 Statistical Mechanics;
 Three Dimensional Flow;
 Turbulent Flow;
 Chaos;
 Coherence;
 Eddy Viscosity;
 Flow Stability;
 Flow Theory;
 NavierStokes Equation;
 Shear Layers;
 Fluid Mechanics and Heat Transfer