Passive scalar intermittency in compressible flow
chao-dyn
2009-10-31 v2 混沌动力学
摘要
A compressible generalization of the Kraichnan model (Phys. Rev. Lett. 72, 1016 (1994)) of passive scalar advection is considered. The dynamical role of compressibility on the intermittency of the scalar statistics is investigated for the direct cascade regime. Simple physical arguments suggest that an enhanced intermittency should appear for increasing compressibility, due to the slowing down of Lagrangian trajectory separations. This is confirmed by a numerical study of the dependence of intermittency exponents on the degree of compressibility, by a Lagrangian method for calculating simultaneous N-point tracer correlations.
引用
@article{arxiv.chao-dyn/9902011,
title = {Passive scalar intermittency in compressible flow},
author = {A. Celani and A. Lanotte and A. Mazzino},
journal= {arXiv preprint arXiv:chao-dyn/9902011},
year = {2009}
}
备注
4 pages, 3 figures Revised version, accepted for publication in PRE - Rapid communications