Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-14
Physical Review E, 2003, v. 68, No. 1, 016311 (1-8)
Astronomy and Astrophysics
Astrophysics
8 pages, 3 figures, REVTEX4, submitted to Phys. Rev. E
Scientific paper
10.1103/PhysRevE.68.016311
An effect of a mean velocity shear on a turbulence and on the effective force which is determined by the gradient of Reynolds stresses is studied. Generation of a mean vorticity in a homogeneous incompressible turbulent flow with an imposed mean velocity shear due to an excitation of a large-scale instability is found. The instability is caused by a combined effect of the large-scale shear motions (''skew-induced" deflection of equilibrium mean vorticity) and ''Reynolds stress-induced" generation of perturbations of mean vorticity. Spatial characteristics, such as the minimum size of the growing perturbations and the size of perturbations with the maximum growth rate, are determined. This instability and the dynamics of the mean vorticity are associated with the Prandtl's turbulent secondary flows. This instability is similar to the mean-field magnetic dynamo instability. Astrophysical applications of the obtained results are discussed.
Elperin Tov
Kleeorin Nathan
Rogachevskii Igor
No associations
LandOfFree
Generation of Large-Scale Vorticity in a Homogeneous Turbulence with a Mean Velocity Shear does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Generation of Large-Scale Vorticity in a Homogeneous Turbulence with a Mean Velocity Shear, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Generation of Large-Scale Vorticity in a Homogeneous Turbulence with a Mean Velocity Shear will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-219749