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Integrated exploration of turbulent cross-helicity effect: theory, observation, modeling and numerical simulations of the solar convection zone

By N. Yokoi, G. Balarac, I.N. Kitiashvili, N. Kleeorin, A.G. Kosovichev, I. Rogachevskii and R. Simitev

Abstract

Cross helicity (velocity–magnetic-field correlation) is one of the basic quantities in magnetohydrodynamics. In the presence of large-scale vortical motion, if there is positive (or negative) cross helicity in turbulence, a contribution to the electromotive force parallel (or anti-parallel) to the large-scale vorticity arises. By considering the evolution equation of turbulent cross helicity, the mechanisms that create turbulence with cross\ud helicity are investigated. In order to analyze cross helicity-related transport and crosshelicity generation mechanisms, three kinds of numerical simulations are performed: (i)direct numerical simulations of the local Kolmogorov flow with an imposed magnetic field, (ii) global direct simulation of a rotating spherical fluid shell, and (iii) large-eddy simulation of the local compressible flow near the sunspot region. Through these simulations,\ud the importance of the cross-helicity effect is validated. The cross-helicity generation mechanisms relevant to the incompressible and compressible cases are also discussed

Topics: QA
Publisher: Center for Turbulence Research
Year: 2010
OAI identifier: oai:eprints.gla.ac.uk:49209
Provided by: Enlighten
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