Effects of shear flows on the evolution of fluctuations in interchange turbulence
Plasma Physics
2017-11-28 v1 Fluid Dynamics
Abstract
We report a non-perturbative study of the effect of different type of shear flows on the evolution of vorticity and particle density fluctuations in interchange turbulence. For the same shear strength, the transport of density is less reduced by streamers than by zonal flows, zonal flows leading to oscillation death. In the inviscid limit, vorticity (density) grows (decays) as a power law due to streamer or zonal flow, and exponentially due to the combined effect of zonal flow and streamer with the same sign of shear. Zonal flow and streamer with the opposite sign of shear lead to oscillation at multiple frequencies.
Keywords
Cite
@article{arxiv.1711.04897,
title = {Effects of shear flows on the evolution of fluctuations in interchange turbulence},
author = {Ismail Movahedi and Eun-jin Kim},
journal= {arXiv preprint arXiv:1711.04897},
year = {2017}
}
Comments
4 pages, 6 figures, Physics of Plasmas (2017)