Statistics
Scientific paper
Mar 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..mar.u4007s&link_type=abstract
American Physical Society, Annual APS March Meeting, March 18 - 22, 2002 Indiana Convention Center; Indianapolis, Indiana Meetin
Statistics
Scientific paper
The turbulent flows in the atmospheres of planets are characterized by the formation of large coherent structures. The formation of those structures is a direct result of the high rotation of the planets. When the rotation is high, the flow becomes effectively two-dimensional and the large structures are thus formed via the inverse cascade of energy, typical to 2D turbulent flows. Still, the details of the transition form 3D to 2D turbulence, as well as the steady state statistics of the resultant flow, are not yet well understood. We present an experimental study of turbulent flow in a rotating tank with small wavelength, homogeneous 3D turbulence generated at its bottom. As a result of the strong rotation, we obtain a steady state in which 3D turbulence is found at the bottom of the tank and 2D turbulence at its top. Applying Particle image velocimetry (PIV) technique, we study the steady state 2D turbulence, focusing on the scaling of the largest structures in the flow, using flat or sloped (Beta) plains as top boundaries. We also study the spatial transition between 3D and 2D turbulence by visualizing horizontal slices of the flow in the transition layer between those regions. Finally, We measure the rate of energy dissipation in the system, and link it to the statistical properties of the flow.
Morris Stephen
Ruppert-Felsot Jori
Sharon Eran
Swinney Harry
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