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

Yokoi, N., Balarac, G., Kitiashvili, I.N., Kleeorin, N., Kosovichev, A.G., Rogachevskii, I. and Simitev, R. (2010) Integrated exploration of turbulent cross-helicity effect: theory, observation, modeling and numerical simulations of the solar convection zone. Proceedings of 2010 CTR Summer Program, pp. 493-502.

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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 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, the importance of the cross-helicity effect is validated. The cross-helicity generation mechanisms relevant to the incompressible and compressible cases are also discussed.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Simitev, Dr Radostin
Authors: Yokoi, N., Balarac, G., Kitiashvili, I.N., Kleeorin, N., Kosovichev, A.G., Rogachevskii, I., and Simitev, R.
Subjects:Q Science > QA Mathematics
College/School:College of Science and Engineering > School of Mathematics and Statistics > Mathematics
Journal Name:Proceedings of 2010 CTR Summer Program
Publisher:Center for Turbulence Research
Published Online:01 December 2010
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