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J. Fluid Mech. (1996), vol. 312, pp. 327-340 Copyright @ 1996Cambridge University Press
 

Summary: J. Fluid Mech. (1996), vol. 312, pp. 327-340
Copyright @ 1996Cambridge University Press
327
Ekman pumping in compact astrophysical bodies
By M A R K ABNEY1,2A N D R I C H A R D I. EPSTEIN2
Department of Astronomy and Astrophysics, The Enrico Fermi Institute, The University of
Chicago, Chicago, IL 60637, USA and NASA/Fermilab Astrophysics Center, Fermi National
Accelerator Laboratory, Batavia, 1L 60510, USA
e-mail: abney@oddjob.uchicago.edu
2LosAIamos National Laboratory, MS D436, Los Alamos, NM 87545, USA
e-mail: epstein@lanl.gov
(Received 10 October 1995)
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

  

Source: Abney, Mark - Department of Human Genetics, University of Chicago

 

Collections: Computer Technologies and Information Sciences; Biology and Medicine