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• W1501990430 abstract "We use direct numerical simulations to compute structure functions, scaling exponents, probability density functions and turbulent transport coefficients of passive scalars in turbulent rotating helical and non-helical flows. We show that helicity affects the inertial range scaling of the velocity and of the passive scalar when rotation is present, with a spectral law consistent with $sim k_{perp}^{-1.4}$ for the passive scalar variance spectrum. This scaling law is consistent with the phenomenological argument presented in cite{imazio2011} for rotating non-helical flows, wich states that if energy follows a $E(k)sim k^{-n}$ law, then the passive scalar variance follows a law $V(k) sim k^{-n_{theta}}$ with $n_{theta}=(5-n)/2$. With the second order scaling exponent obtained from this law, and using the Kraichnan model, we obtain anomalous scaling exponents for the passive scalar that are in good agreement with the numerical results. Intermittency of the passive scalar is found to be stronger than in the non-helical rotating case, a result that is also confirmed by stronger non-Gaussian tails in the probability density functions of field increments. Finally, Fick's law is used to compute the effective diffusion coefficients in the directions parallel and perpendicular to the rotation axis. Calculations indicate that horizontal diffusion decreases in the presence of helicity in rotating flows, while vertical diffusion increases. We use a mean field argument to explain this behavior in terms of the amplitude of velocity field fluctuations." @default.
• W1501990430 created "2016-06-24" @default.
• W1501990430 creator A5007082915 @default.
• W1501990430 creator A5037985542 @default.
• W1501990430 date "2017-03-06" @default.
• W1501990430 modified "2023-10-14" @default.
• W1501990430 title "Passive scalars: Mixing, diffusion, and intermittency in helical and nonhelical rotating turbulence" @default.
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• W1501990430 doi "https://doi.org/10.1103/physreve.95.033103" @default.
• W1501990430 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28415185" @default.
• W1501990430 hasPublicationYear "2017" @default.
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