Turbulent viscosity and Lambda-effect from numerical turbulence models

Details Turbulent viscosity and Lambda-effect from numerical turbulence models Turbulent viscosity and Lambda-effect from numerical turbulence models

2007-10-30

arxiv.org/abs/0710.5632v1

Astron. Nachr. 328, 1006-1008 (2007)

Astronomy and Astrophysics

Astrophysics

3 pages, 2 figures, accepted for publication in Astronomische Nachrichten

Scientific paper

10.1002/asna.200710861

Homogeneous anisotropic turbulence simulations are used to determine off-diagonal components of the Reynolds stress tensor and its parameterization in terms of turbulent viscosity and Lambda-effect. The turbulence is forced in an anisotropic fashion by enhancing the strength of the forcing in the vertical direction. The Coriolis force is included with a rotation axis inclined relative to the vertical direction. The system studied here is significantly simpler than that of turbulent stratified convection which has often been used to study Reynolds stresses. Certain puzzling features of the results for convection, such as sign changes or highly concentrated latitude distributions, are not present in the simpler system considered here.

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