Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-06-28
Astronomy and Astrophysics
Astrophysics
9 pages, 9 figures, Astron. Nachr., in press
Scientific paper
10.1002/1521-3994(200107)322:3<1
The velocity fluctuations in a spherical shell arising from sinusoidal perturbations of a Keplerian shear flow with a free amplitude parameter \epsilon are studied numerically by means of fully 3D nonlinear simulations. The investigations are performed at high Reynolds numbers, i.e. 3000 < Re < 5000. We find Taylor-Proudman columns of large eddies parallel to the rotation axis for sufficiently strong perturbations. An instability sets in at critical amplitudes with \epsilon_crit \propto Re^-1. The whole flow turns out to be almost axisymmetric and nonturbulent exhibiting, however, a very rich radial and latitudinal structure. The Reynolds stress is positive in the entire computational domain, from its Gaussian radial profile a positive viscosity-alpha of about 10^-4 is derived. The kinetic energy of the turbulent state is dominated by the azimuthal component
Drecker A.
Rudiger Günther
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