Fabio Del Sordo (NORDITA)
2/18/11, 9:00 AM
In the absence of rotation and shear, and under the assumption of constant temperature or specific entropy, purely potential forcing by localized expansion waves is known to produce irrotational flows that have no vorticity. Here we study the production of vorticity under idealized conditions when there is rotation, shear, or baroclinicity, to address the problem of vorticity generation...
Dr luiz garcia (dept pf theoretical physics)
2/18/11, 9:20 AM
GR MHd dynamo equation of marklund and clarkson (MNRAS-2005) is used to show that the extra galactic source magnetic contrast is well within the limit stablished by Reinhardt of 1.7. Actually the result obtained is 2.0 minus expansion terms in friedmann universe.
Axel Brandenburg (Nordita)
2/18/11, 9:40 AM
The turbulent diffusivity tensor is determined for linear shear flow turbulence using numerical simulations. For moderately strong shear, the diagonal components are found to increase quadratically with Peclet and Reynolds numbers below about 10 and then become constant. The diffusivity tensor is found to have components proportional to the symmetric and antisymmetric parts of the...
Dr Shiva Kumar Malapaka
2/18/11, 10:00 AM
Large-scale magnetic structure formation in the universe is one of the problems in modern astrophysics, which lacks a clear solution. A possible explanation for the formation of such structures could be offered from a property of 3D- magnetohydrodynamic (MHD) turbulence, namely inverse cascade of magnetic helicity. Magnetic helicity is defined as the volume integral of the dot product of...