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Compressibility in turbulent magnetohydrodynamics and passive scalar transport: mean-field theory
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben-Gurion University of the Negev, Israel.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Ben-Gurion University of the Negev, Israel.
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Stockholm University, Faculty of Science, Department of Astronomy. University of Colorado, USA.ORCID iD: 0000-0002-7304-021X
Number of Authors: 32018 (English)In: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 84, no 5, article id 735840502Article in journal (Refereed) Published
Abstract [en]

We develop a mean-field theory of compressibility effects in turbulent magnetohydrodynamics and passive scalar transport using the quasi-linear approximation and the spectral tau-approach. We find that compressibility decreases the a effect and the turbulent magnetic diffusivity both at small and large magnetic Reynolds numbers, Rm. Similarly, compressibility decreases the turbulent diffusivity for passive scalars both at small and large Peclet numbers, Pe. On the other hand, compressibility does not affect the effective pumping velocity of the magnetic field for large Rm, but it decreases it for small Rm. Density stratification causes turbulent pumping of passive scalars, but it is found to become weaker with increasing compressibility. No such pumping effect exists for magnetic fields. However, compressibility results in a new passive scalar pumping effect from regions of low to high turbulent intensity both for small and large Peclet numbers. It can be interpreted as compressible turbophoresis of non-inertial particles and gaseous admixtures, while the classical turbophoresis effect exists only for inertial particles and causes them to be pumped to regions with lower turbulent intensity.

Place, publisher, year, edition, pages
2018. Vol. 84, no 5, article id 735840502
Keywords [en]
astrophysical plasmas, plasma nonlinear phenomena
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-162746DOI: 10.1017/S0022377818000983ISI: 000450961400001OAI: oai:DiVA.org:su-162746DiVA, id: diva2:1275072
Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-04Bibliographically approved

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Rogachevskii, IgorBrandenburg, Axel
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