On the application of direct-interaction approximation to the turbulent convection problem

Authors
Citation
Bk. Shivamoggi, On the application of direct-interaction approximation to the turbulent convection problem, PHYSICA A, 286(3-4), 2000, pp. 447-456
Citations number
15
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICA A
ISSN journal
0378-4371 → ACNP
Volume
286
Issue
3-4
Year of publication
2000
Pages
447 - 456
Database
ISI
SICI code
0378-4371(20001101)286:3-4<447:OTAODA>2.0.ZU;2-2
Abstract
In this paper, we seek to clarify some issues associated with the applicati on of the direct-interaction approximation (DIA) to the turbulent-convectio n problem. The small-Prandtl number and the large-Prandtl number regimes ar e investigated separately. The DIA is confirmed to lead to some unphysical features in the Pr much less than 1 regime. However, in the Pr much greater than 1 regime where the perturbative treatment is valid, the unphysical fe atures of the DIA formulation are shown to be actually artifacts of the per turbative aspect itself and the renormalization added on in the DIA does no t change this very much. (C) 2000 Elsevier Science B.V. All rights reserved .