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ANISOTROPIC MHD TURBULENCE AT LOW MAGNETIC REYNOLDS NUMBER

Anatoliy Vorobev
Department of Mechanical Engineering, University of Michigan − Dearborn Dearborn, Michigan 48128-1491, USA

Oleg Zikanov
Department of Mechanical Engineering, University of Michigan − Dearborn Dearborn, Michigan 48128-1491, USA

Abstrakt

Turbulent fluctuations in MHD flows become anisotropic under the action of a sufficiently strong magnetic field. We consider the case of low magnetic Reynolds number and investigate this phenomenon in DNS and LES simulations of forced flows in a periodic box with Reλ up to 300 and different strengths of imposed magnetic field. Our analysis shows that both the componental (difference in amplitudes of velocity components) and dimensional (difference in velocity gradients) anisotropics are predominantly determined by the value of the magnetic interaction parameter. Degree of flow anisotropy is not significantly affected by the Reynolds number and details of large-scale forcing. It is also virtually scale-independent in a wide range of length scales.