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Eddy diffusivity, eddy noise and subgrid-scale modelling

Published online by Cambridge University Press:  12 April 2006

Harvey A. Rose
Harvey A. Rose
Affiliation:
Observatoire de Nice, Le Mont-Gros, 06300 Nice, France Present address: Los Alamos Scientific Laboratory, Los Alamos, New Mexico, 87545.
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Abstract

A subgrid model is presented for a passive scalar advected by a randomly prescribed frozen velocity field. In addition to an eddy diffusivity it has a term which describes the injection of noise from the subgrid scales, and a term which implicitly describes the coupling between the large eddies and the eddies just below the limit of resolution of the finite-difference grid. The construction of the model is based upon an iterative procedure which models away first the dissipation-range eddies and then the eddies of a slightly larger size, etc.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 81 , Issue 4 , 5 August 1977 , pp. 719 - 734
Copyright
© 1977 Cambridge University Press

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