Passive scalar cascades in rotating helical and non-helical flows

We study how helicity affects the spectrum of a passive scalar in rotating turbulent flows, using numerical simulations of turbulent flows with or without rotation, and with or without injection of helicity. Scaling laws for energy and passive scalar spectra in the direction perpendicular to the rot...

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Bibliographic Details
Published in:arXiv.org 2012-07
Main Authors: Paola Rodriguez Imazio, Mininni, Pablo Daniel
Format: Article
Language:English
Subjects:
Cascades
Computational fluid dynamics
Computer simulation
Energy spectra
Helical flow
Helicity
Mathematical models
Rotation
Scaling laws
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Summary:We study how helicity affects the spectrum of a passive scalar in rotating turbulent flows, using numerical simulations of turbulent flows with or without rotation, and with or without injection of helicity. Scaling laws for energy and passive scalar spectra in the direction perpendicular to the rotation axis differ in rotating helical flows from the ones found in the non-helical case, with the spectrum of passive scalar variance in the former case being shallower than in the latter. A simple phenomenological model that links the effects of helicity on the energy spectrum with the passive scalar spectrum is presented.
ISSN:2331-8422