Turbulence-condensate interaction in two dimensions
Fluid Dynamics
2008-11-07 v2 Atmospheric and Oceanic Physics
Abstract
We present experimental results on turbulence generated in thin fluid layers in the presence of a large-scale coherent flow, or a spectral condensate. It is shown that the condensate modifies the third-order velocity moment in a much wider interval of scales than the second one. The modification may include the change of sign of the third moment in the inverse cascade. This observation may help resolve a controversy on the energy flux in mesoscale atmospheric turbulence (10-500 km): to recover a correct energy flux from the third velocity moment one needs first to subtract the coherent flow. We find that the condensate also increases the velocity flatness.
Cite
@article{arxiv.0806.3116,
title = {Turbulence-condensate interaction in two dimensions},
author = {H. Xia and H. Punzmann and G. Falkovich and M. G. Shats},
journal= {arXiv preprint arXiv:0806.3116},
year = {2008}
}
Comments
4 pages, 4 figures