• Field theoretic calculation of energy cascade rates in non-helical magnetohydrodynamic turbulence

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      https://www.ias.ac.in/article/fulltext/pram/061/03/0577-0594

    • Keywords

       

      Magnetohydrodynamics; turbulence; field theory

    • Abstract

       

      Energy cascade rates and Kolmogorov’s constant for non-helical steady magnetohydrodynamic turbulence have been calculated by solving the flux equations to the first order in perturbation. For zero cross helicity and space dimensiond = 3, magnetic energy cascades from large length-scales to small length-scales (forward cascade). In addition, there are energy fluxes from large-scale magnetic field to small-scale velocity field, large-scale velocity field to small-scale magnetic field, and large-scale velocity field to large-scale magnetic field. Kolmogorov’s constant for magnetohydrodynamics is approximately equal to that for fluid turbulence (≈ 1.6) for Alfvén ratio 05 ≤rA ≤ ∞. For higher space-dimensions, the energy fluxes are qualitatively similar, and Kolmogorov’s constant varies asd1/3. For the normalized cross helicity σc →1, the cascade rates are proportional to (1 − σc)/(1 + σc , and the Kolmogorov’s constants vary significantly with σcc.

    • Author Affiliations

       

      Mahendra K Verma1

      1. Department of Physics, Indian Institute of Technology, Kanpur - 208 016, India
    • Dates

       
  • Pramana – Journal of Physics | News

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