Logarithmic violation of scaling in anisotropic kinematic dynamo model

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Abstract

Inertial-range asymptotic behavior of a vector (e.g., magnetic) field, passively advected by a strongly anisotropic turbulent flow, is studied by means of the field theoretic renormalization group and the operator product expansion. The stochastic advection-diffusion equation for the transverse (divergence-free) vector field includes, as special cases, the kinematic dynamo model for magnetohydrodynamic turbulence and the linearized Navier–Stokes equation. In contrast to the well known isotropic Kraichnan’s model, where various correlation functions exhibit anomalous scaling behavior with infinite sets of anomalous exponents, here the dependence on the integral turbulence scale L has a logarithmic behavior: instead of powerlike corrections to ordinary scaling, determined by naive (canonical) dimensions, the anomalies manifest themselves as polynomials of logarithms of L.
Original languageEnglish
Pages (from-to)100006_1-20
JournalAIP Conference Proceedings
Volume1701
DOIs
StatePublished - 2016

Keywords

  • anomalous scaling
  • passive vector advection
  • magnetohydrodynamic turbulence
  • renormalization group

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