Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2009-06-18
Phys. Rev. E 82, 016304 (2010)
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
8 pages, 7 figures, accepted by Phys. Rev. E
Scientific paper
10.1103/PhysRevE.82.016304
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 velocity gradient matrix, as well as products of these. All components decrease with the wave number of the mean field in a Lorentzian fashion. The components of the diffusivity tensor are found not to depend significantly on the presence of helicity in the turbulence. The signs of the leading terms in the expression for the diffusion tensor are found to be in good agreement with estimates based on a simple closure assumption.
Brandenburg Axel
Madarassy Eniko J. M.
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