This preliminary study of the mechanism by which local turbulent regions generate internal gravity waves in a stably stratified fluid is based on comparisons of the visual and hot-film- anemometer observations of a jet exhausting into a stratified fluid with those for a jet exhausting into a homogeneous medium. The stratified environment limits the growth of the mean jet boundary, or from another point of view, inhibits the vertical motion of the instantaneous turbulent/non-turbulent interface. The visual and non-conditional statistical averages agree with expectations and with previous measurements in stratified turbulent wakes. Application of a standard criterion to determine the intermittency function for both the stratified and homogeneous cases gives conflicting results. Modification of the intermittency trigger level in the stratified case based on the local turbulence intensity ratio resolves this conflict and indicates that the effect of stratification on the local turbulence properties must be taken into account if the conditionally averaged details of these flows are to be studied further.

Meeting Name

3rd Biennial Symposium on Turbulence in Liquids (1973: Sep., Rolla, MO)


Chemical and Biochemical Engineering


This study was performed under Contract N00017-72-C-4401 with the Department of the Navy.

Document Type

Article - Conference proceedings

Presentation Type

Contributed Paper


Conditioned-Signal Analysis

Document Version

Final Version

File Type





© 1973 University of Missouri--Rolla, All rights reserved.