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J. Fluid Mech. (2006), vol. 553, pp. 227252. c 2006 Cambridge University Press doi:10.1017/S0022112006008810 Printed in the United Kingdom
 

Summary: J. Fluid Mech. (2006), vol. 553, pp. 227252. c 2006 Cambridge University Press
doi:10.1017/S0022112006008810 Printed in the United Kingdom
227
On the flow past a magnetic obstacle
By SERGIO CUEVAS, S ERGEY S MOLENTSEV
AND MOHAMED A. ABDOU
Mechanical and Aerospace Engineering Department, University of California, Los Angeles, 44-114
Engineering IV, Los Angeles, CA 90095-1795, USA
(Received 19 May 2004 and in revised form 1 November 2005)
This paper analyses numerically the quasi-two-dimensional flow of an incompressible
electrically conducting viscous fluid past a localized zone of applied magnetic field,
denominated a magnetic obstacle. The applied field is produced by the superposition of
two parallel magnetized square surfaces, uniformly polarized in the normal direction,
embedded in the insulating walls that contain the flow. The area of these surfaces
is only a small fraction of the total flow domain. By considering inertial effects in
the analysis under the low magnetic Reynolds number approximation, it is shown
that the flow past a magnetic obstacle may develop vortical structures and eventually
instabilities similar to those observed in flows interacting with bluff bodies. In the
small zone where the oncoming uniform flow encounters the non-negligible magnetic
field, the induced electric currents interact with the field, producing a non-uniform

  

Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles

 

Collections: Plasma Physics and Fusion