Ekman Pumping in Compact Astrophysical Bodies

Details Ekman Pumping in Compact Astrophysical Bodies Ekman Pumping in Compact Astrophysical Bodies

1995-04-16

arxiv.org/abs/astro-ph/9504051v2

J.Fluid Mech. 312 (1996) 327-340

Astronomy and Astrophysics

Astrophysics

Latex, 21 pages, 5 ps figures. Revised version includes extended discussion in the introduction and references to previous wor

Scientific paper

10.1017/S0022112096002030

We examine the dynamics of a rotating viscous fluid following an abrupt change in the angular velocity of the solid bounding surface. We include the effects of a density stratification and compressibility which are important in astrophysical objects such as neutron stars. We confirm and extend the conclusions of previous studies that stratification restricts the Ekman pumping process to a relatively thin layer near the boundary, leaving much of the interior fluid unaffected. We find that finite compressibility further inhibits Ekman pumping by decreasing the extent of the pumped layer and by increasing the time for spin-up. The results of this paper are important for interpreting the spin period discontinuities (``glitches'') observed in rotating neutron stars.

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