Role of Cross-Helicity in Magnetohydrodynamic Turbulence
Journal Article
·
· Physical Review Letters
- Department of Physics, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706 (United States)
Strong incompressible three-dimensional magnetohydrodynamic turbulence is investigated by means of high-resolution direct numerical simulations. The simulations show that the configuration space is characterized by regions of positive and negative cross-helicity, corresponding to highly aligned or antialigned velocity and magnetic field fluctuations, even when the average cross-helicity is zero. To elucidate the role of cross-helicity, the spectra and structure of turbulence are obtained in 'imbalanced' regions where cross-helicity is nonzero. When averaged over regions of positive and negative cross-helicity, the result is consistent with the simulations of balanced turbulence. An analytical explanation for the obtained results is proposed.
- OSTI ID:
- 21180119
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 102; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
Similar Records
Strong magnetohydrodynamic turbulence with cross helicity
THEORY OF INCOMPRESSIBLE MAGNETOHYDRODYNAMIC TURBULENCE WITH SCALE-DEPENDENT ALIGNMENT AND CROSS-HELICITY
Theory of incompressible MHD turbulence with scale-dependent alignment, anisotropy, and cross-helicity
Journal Article
·
Sat May 15 00:00:00 EDT 2010
· Physics of Plasmas
·
OSTI ID:21371185
THEORY OF INCOMPRESSIBLE MAGNETOHYDRODYNAMIC TURBULENCE WITH SCALE-DEPENDENT ALIGNMENT AND CROSS-HELICITY
Journal Article
·
Sun Aug 01 00:00:00 EDT 2010
· Astrophysical Journal
·
OSTI ID:21455070
Theory of incompressible MHD turbulence with scale-dependent alignment, anisotropy, and cross-helicity
Journal Article
·
Wed Dec 31 23:00:00 EST 2008
· American Institute of Physics
·
OSTI ID:970029