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Compressibility in turbulent magnetohydrodynamics and passive scalar transport: mean-field theory
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Ben-Gurion University of the Negev, Israel.ORCID-id: 0000-0001-7308-4768
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Ben-Gurion University of the Negev, Israel.
Stockholms universitet, Nordiska institutet för teoretisk fysik (Nordita). Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för astronomi. University of Colorado, USA.ORCID-id: 0000-0002-7304-021X
Rekke forfattare: 32018 (engelsk)Inngår i: Journal of Plasma Physics, ISSN 0022-3778, E-ISSN 1469-7807, Vol. 84, nr 5, artikkel-id 735840502Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2018. Vol. 84, nr 5, artikkel-id 735840502
Emneord [en]
astrophysical plasmas, plasma nonlinear phenomena
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-162746DOI: 10.1017/S0022377818000983ISI: 000450961400001OAI: oai:DiVA.org:su-162746DiVA, id: diva2:1275072
Tilgjengelig fra: 2019-01-04 Laget: 2019-01-04 Sist oppdatert: 2020-03-05bibliografisk kontrollert

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