The importance of internal shearing motions as the driving agent for mixing in stably stratified surroundings is reviewed. This situations has been modelled in the laboratory by producing a shearing flow (starting from an origin in space) across a stably stratified interface. The principal findings are: (i) There are several ways in which the transition to turbulence can occur, depending upon the initial Richardson number. (ii) There is a region of active turbulence followed by decay of turbulence. Stable stratification ultimately destroys the turbulence. (iii) The extent of the turbulent mixing (during the lifetime of the turbulence) decreases dramatically with increasing initial Richardson.
Laboratory experiments on shear generated turbulence in stratified fluid and their relation to oceanic microstructure
Laborexperimente mit scherungsverursachten Turbulenzen in geschichteten Fluessigkeiten und ihr Verhaeltnis zu der Mikrostruktur von Ozeanen
1976
11 Seiten, 8 Bilder, 14 Quellen
Conference paper
English
FLUID DYNAMICS - Strongly Stably Stratified Grid Turbulence Using Second-Moment Closure
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