2D Turbulence & Vortices
In 1995-1996 I have been studying the structure and dispersion
properties of coherent
vortices that emerge in two-dimensional turbulence. These vortices
are observed in many large-scale geophysical flows: examples are the polar
vortex, the red spot on Jupiter and the 'Meddies' of saline water that
propagate from the Straits of Gibraltar into the Ocean.
The experimental set-up consisted of a rotating tank
with stratified fluid, forced with sources and sinks around a horizontal
ring. The flow was visualised using white particles and a horizontal light
sheet, recorded on a VCR and analysed using the DigImage software.
I have an abstract
of the resulting paper available on-line, and the full text can be found
in the Journal of Fluid Mechanics.
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Dynamics Laboratory home page
Frans de Rooij,
last modified 2 March 1999.