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Generation of inertial waves, jets and vortices in astrophysical turbulence
  Nordita Astrophysics seminars

Wednesday 22 February 2012
from 13:30 to 14:30
at 122:026
Speaker : Nathan Kleeorin (Ben-Gurion University of the Negev, Beer-Sheva)
Abstract : We discuss a nonlinear stage of a large-scale instability in a sheared nonhelical turbulence. This instability causes generation of large-scale vorticity. The nonlinearity is determined by the budget equation for the turbulent kinetic energy and results in increase of the turbulent viscosity with the increase of the mean vorticity. In addition, this instability in nonlinear stage causes the generation of kinetic helicity. We also discuss a mechanism of excitation of the large-scale inertial waves and jets in a rotating inhomogeneous (or density stratified turbulence) due to an excitation of a large-scale instability. This instability is caused by a combined effect of the inhomogeneity of the turbulence and the uniform mean rotation. The source of these large-scale instabilities is the energy of the small-scale turbulence. Applications to astrophysical and geophysical turbulence is discussed.

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