HOMOGENEOUS TURBULENCE EVOLUTION IN STABLY STRATIFIED FLOW .1. INTERNAL GRAVITY-WAVES AT LOW INVERSE FROUDE NUMBERS

Authors
Citation
Va. Babenko, HOMOGENEOUS TURBULENCE EVOLUTION IN STABLY STRATIFIED FLOW .1. INTERNAL GRAVITY-WAVES AT LOW INVERSE FROUDE NUMBERS, International journal of heat and mass transfer, 40(8), 1997, pp. 1951-1961
Citations number
21
Categorie Soggetti
Mechanics,"Engineering, Mechanical",Thermodynamics
ISSN journal
00179310
Volume
40
Issue
8
Year of publication
1997
Pages
1951 - 1961
Database
ISI
SICI code
0017-9310(1997)40:8<1951:HTEISS>2.0.ZU;2-I
Abstract
The evolution of homogeneous grid-generated turbulence in stratified f luid is investigated analytically. A small parameter decomposition on inverse Froude number is applied to the theory of nearly homogeneous t urbulence developed earlier in refs. [1] and [2]. Applying the multipl e scale method we calculate the frequency and amplitude of internal gr avity waves and formulate differential system describing the wave-aver aged behaviour of turbulence characteristics. The comparison with the numerical results published in (?1 and with known experimental data sh ows a very good agreement as to internal waves as to small scale turbu lence in collapsed state. The long-term turbulence evolution in weakly stratified media can be regarded as a singular perturbation problem p ermitting us to gain an insight into the interaction between gravity w aves and active turbulence. (C) 1997 Elsevier Science Ltd.