Physics – Fluid Dynamics
Scientific paper
2011-04-28
Physics
Fluid Dynamics
13 pages, 6 figures
Scientific paper
We present numerical evidence of how three-dimensionalization occurs at small scale in rotating turbulence with Beltrami (ABC) forcing, creating helical flow. The Zeman scale $\ell_{\Omega}$ at which the inertial and eddy turn-over times are equal is more than one order of magnitude larger than the dissipation scale, with the relevant domains (large-scale inverse cascade of energy, dual regime in the direct cascade of energy $E$ and helicity $H$, and dissipation) each moderately resolved. These results stem from the analysis of a large direct numerical simulation on a grid of $3072^3$ points, with Rossby and Reynolds numbers respectively equal to 0.07 and $2.7\times 10^4$. At scales smaller than the forcing, a helical wave-modulated inertial law for the energy and helicity spectra is followed beyond $\ell_{\Omega}$ by Kolmogorov spectra for $E$ and $H$. Looking at the two-dimensional slow manifold, we also show that the helicity spectrum breaks down at $\ell_{\Omega}$, a clear sign of recovery of three-dimensionality in the small scales.
Mininni Pablo Daniel
Pouquet Annick
Rosenberg Danna
No associations
LandOfFree
Isotropisation at small scales of rotating helically-driven turbulence 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 Isotropisation at small scales of rotating helically-driven turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isotropisation at small scales of rotating helically-driven turbulence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-16994