Strong magnetohydrodynamic turbulence with cross helicity
نویسندگان
چکیده
منابع مشابه
Role of cross-helicity in magnetohydrodynamic turbulence.
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...
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This paper proposes a new phenomenology for strong incompressible MHD turbulence with nonzero cross helicity. This phenomenology is then developed into a quantitative Fokker-Planck model that describes the time evolution of the anisotropic power spectra of the fluctuations propagating parallel and anti-parallel to the background magnetic field B0. It is found that in steady state the power spec...
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The nonlinear dynamics of magnetic helicity HM, which is responsible for large-scale magnetic structure formation in electrically conducting turbulent media, is investigated in forced and decaying three-dimensional magnetohydrodynamic turbulence. This is done with the help of high-resolution direct numerical simulations and statistical closure theory. The numerically observed spectral scaling o...
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Different results for the cascade power ε in strong, incompressible MHD turbulence with nonzero cross helicity appear in the literature. In this paper, we discuss the conditions under which these different results are valid. Our conclusions can be expressed in terms of the density ρ, the rms amplitudes z+ and z− of Alfvénic fluctuations propagating parallel and anti-parallel to the background m...
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a . bd3r (a = vector potential of magnetic field b) s for incompressible three-dimensional turbulent MHD flows are investigated. Absolute equilibrium spectra for inviscid infinitely conducting flows truncated at lower and upper wavenumbers k,,, and k,, are obtained. When the total magnetic helicity approaches an upper limit given by the total energy (kinetic plus magnetic) divided by the spectr...
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ژورنال
عنوان ژورنال: Physics of Plasmas
سال: 2010
ISSN: 1070-664X,1089-7674
DOI: 10.1063/1.3396370