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      Kinetic helicity and MHD turbulence

      Oughton, Sean; Prandi, Rossella
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      Kinetic helicity.pdf
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      DOI
       10.1017/s0022377800008424
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      Oughton, S., & Prandi, R. (2000). Kinetic helicity and MHD turbulence. Journal of Plasma Phycis, 64(2), 179-193.
      Permanent Research Commons link: https://hdl.handle.net/10289/8608
      Abstract
      The issue of dynamical anisotropy in helical three-dimensional magnetohydrodynamic turbulence with a mean magnetic field B₀ is investigated. Using high-resolution direct numerical simulations, we follow the evolution of various isotropic initial states characterized by their different values of the kinetic helicity. The cross helicity and magnetic helicity of the initial conditions are also varied. In agreement with earlier work, we find that such initial states become anisotropic in of order an eddy-turnover time, with correlation lengths parallel to B₀ remaining largely unchanged while finer scales are excited in the perpendicular directions. Moreover, it is found that the development of both the anisotropy and the energy are essentially independent of the initial level of kinetic helicity. The physics associated with this latter feature is discussed.
      Date
      2000
      Type
      Journal Article
      Publisher
      Cambridge University Press
      Rights
      © 2000 Cambridge University Press
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      • Computing and Mathematical Sciences Papers [1454]
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