Vortex rings and the solar granulation

Details Vortex rings and the solar granulation Vortex rings and the solar granulation

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422..862a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 422, no. 2, p. 862-869

Astronomy and Astrophysics

Astronomy

5

Astronomical Models, Hydrodynamics, Mathematical Models, Solar Granulation, Vortex Rings, Vorticity, Expansion, Gravitational Fields, Solar Convection (Astronomy), Stratification

Scientific paper

Observations indicate that solar granules have the flow topology of updraft vortex loops. We interpret granule behavior in terms of the mutual and self-interactions of such loops. In particular, the expansion phase that granules commonly undergo is explained by the self-expansion of a vortex ring in a stratified fluid. For a range of granular parameters, we find that the expansion velocity of a vortex ring varies from 0.7 to 1.5 times the maximum surface flow velocity, in agreement with granule observations. We also present speculation on the nature of granule fragmentation.

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