Nonconservative and reverse spectral transfer in HasegawaMima turbulence
The dual cascade is generally represented as a conservative cascade of enstrophy to short wavelengths through an enstrophy similarity range and an inverse cascade of energy to long wavelengths through an energy similarity range. This picture, based on a proof due to Kraichnan [Phys. Fluids [bold 10], 1417 (1967)], is found to be significantly modified for spectra of finite extent. Dimensional arguments and direct measurement of spectral flow in HasegawaMima turbulence indicate that for both the energy and enstrophy cascades, transfer of the conserved quantity is accompanied by a nonconservative transfer of the other quantity. The decrease of a given invariant (energy or enstrophy) in the nonconservative transfer in one similarity range is balanced by the increase of that quantity in the other similarity range, thus maintaining net invariance. The increase or decrease of a given invariant quantity in one similarity range depends on the injection scale and is consistent with that quantity being carried in a selfsimilar transfer of the other invariant quantity. This leads, in an inertial range of finite size, to some energy being carried to small scales and some enstrophy being carried to large scales.
 Authors:

;
^{[1]}
 (Department of Physics, University of WisconsinMadison, Madison, Wisconsin 53706 (United States))
 Publication Date:
 OSTI Identifier:
 6519018
 DOE Contract Number:
 FG0289ER53291
 Resource Type:
 Journal Article
 Resource Relation:
 Journal Name: Physics of Fluids B; (United States); Journal Volume: 5:7
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; TURBULENT FLOW; ENERGY SPECTRA; ENERGY TRANSFER; CASCADE THEORY; ENERGY CASCADE; MAGNETOHYDRODYNAMICS; NAVIERSTOKES EQUATIONS; DIFFERENTIAL EQUATIONS; EQUATIONS; FLUID FLOW; FLUID MECHANICS; HYDRODYNAMICS; MECHANICS; PARTIAL DIFFERENTIAL EQUATIONS; SPECTRA; WASTE HEAT UTILIZATION; WASTE PRODUCT UTILIZATION 661300*  Other Aspects of Physical Science (1992); 700340  Plasma Waves, Oscillations, & Instabilities (1992)