Centrifugal instability in rotating shallow water and the problem of the spiral structure in galaxies

Details Centrifugal instability in rotating shallow water and the problem of the spiral structure in galaxies Centrifugal instability in rotating shallow water and the problem of the spiral structure in galaxies

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985phla..109..228f&link_type=abstract

Physics Letters (ISSN 0375-9601), vol. 109A, May 27, 1985, p. 228-231.

Physics

26

Centrifugal Force, Flow Stability, Galactic Structure, Rotating Fluids, Shallow Water, Spiral Galaxies, Angular Velocity, Kelvin-Helmholtz Instability, Vortices

Scientific paper

A new instability predicted by theory to occur in rotating shallow water in which the rotation velocity has a discontinuity, in a regime where the flow velocity exceeds the characteristic velocity of the waves, has been found experimentally. The instability develops when the radial gradient of the angular velocity across the discontinuity is negative; such an instability is likely to be responsible for the formation of the spiral structure in galaxies which have a similar rotational velocity profile.

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