Physics – Fluid Dynamics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dfd.ml007s&link_type=abstract
American Physical Society, 57th Annual Meeting of the Division of Fluid Dynamics, 21-23 November, 2004, Seattle, Washington, MEE
Physics
Fluid Dynamics
Scientific paper
We have carried high resolution numerical simulations of long-lived 3D vortices in very stratified atmospheres (ie, with Brunt-Vaisala periods much less than the vortex turn-around times). These conditions mimic those of the large vortices on Jupiter, Saturn and Neptune. The vertical velocities and spatial extents of these vortices are much smaller than their corresponding radial values. We compare the fully 3D results with 2D (shallow-water and geostrophic) calculations of the same physical flows. We also compare the results with numerical simulations of robust 3D vortices in much less stratified atmospheres (such as those in protoplanetary accretion disks) where the vortex turn-around time is less than or equal to the Brunt-Vaisala period. The latter vortices have significant vertical velocities and extents. Mergers of like-signed vortices are common for both the strongly and weakly stratified types of vortices, so both flows containing either type of vortex produce forward and inverse cascades of energy. We compare and contrast energy transfer mechanism in the two types of vortices. We also compare and contrast passive scalar transport.
Marcus Philip
Shetty Sushil
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