Physics – Fluid Dynamics
Scientific paper
2009-05-22
Physics
Fluid Dynamics
To appear in Procs. IUTAM Symposium on Turbulence in the Atmosphere and Oceans, 08-7 = GA.06-02
Scientific paper
The dynamics of convecting fluids in rotating spherical shells is governed at Prandtl numbers of the order unity by the interaction between differential rotation and roll-like convection eddies. While the differential rotation is driven by the Reynolds stresses of the eddies, its shearing action inhibits convection and causes phenomena such as localized convection and turbulent relaxation oscillations. The response of the system is enriched in the case of dynamo action. Lorentz forces may brake either entirely or partially the geostrophic differential rotation and give rise to two rather different dynamo states. Bistability of turbulent dynamos exists for magnetic Prandtl numbers of the order unity. While the ratios between 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.
Busse Friedrich H.
Simitev Radostin D.
No associations
LandOfFree
Some Unusual Properties of Turbulent Convection and Dynamos in Rotating Spherical Shells does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Some Unusual Properties of Turbulent Convection and Dynamos in Rotating Spherical Shells, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Some Unusual Properties of Turbulent Convection and Dynamos in Rotating Spherical Shells will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-325849