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SUMMARY:Unusual properties of turbulent convection and dynamos in spherica
 l shells - Busse\, FH (Bayreuth)
DTSTART:20081209T140000Z
DTEND:20081209T143000Z
UID:TALK15627@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:The dynamics of convecting fluids in rotating spherical shells
  is governed at Prandtl numbers of the order unity by the interaction betw
 een differential rotation and roll-like convection eddies. While the diffe
 rential rotation is driven by the Reynolds stresses of the eddies\, its sh
 earing action inhibits convection and causes phenomena such as localized c
 onvection and turbulent relaxation oscillations. The response of the syste
 m is enriched in the case of dynamo action. Lorentz forces may brake eithe
 r entirely or partially the geostrophic differential rotation and give ris
 e to two rather different dynamo states. Bistability of turbulent dynamos 
 exists for magnetic Prandtl numbers of the order unity. While the ratios b
 etween mean magnetic and kinetic energies differ by a factor of 5 or more 
 for the two dynamo states\, the mean convective heat transports are nearly
  the same. They are much larger than in the absence of a magnetic field.
LOCATION:Seminar Room 1\, Newton Institute
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