Theoretical investigation of the decay of scalar variance injected into homogeneous turbulence
Abstract
The results of a theoretical investigation of the decay of a passive scalar injected into a decaying field of homogeneous turbulence are reported. The motive is to understand more completely the apparent variability of the scalar time scale that shows up in experiments. The author explores the suggestion by Warhaft and Lumley (1978) that this variability is related to the initial peak in the scalar distribution relative to that of the velocity field. In terms of the ingredients of the theory based on the test field model considered, by Kraichnan (1971) and by Newman and Herring (1979), the author discusses variation of the scalar time scale as a function of the integral scales and the nature of the scalar decay, if the length scales of the velocity and scalar fields are quite different.
 Publication:

ASME and American Society of Civil Engineers, Joint Applied Mechanics, Fluids Engineering, and Bioengineering Conference
 Pub Date:
 June 1981
 Bibcode:
 1981amfe.conf.....H
 Keywords:

 Computational Fluid Dynamics;
 Homogeneous Turbulence;
 Scalars;
 Closure Law;
 Decay Rates;
 Equations Of Motion;
 Isotropic Media;
 Kinetic Energy;
 Fluid Mechanics and Heat Transfer