A two-component phenomenology for homogeneous magnetohydrodynamic turbulence

Oughton, S.; Dmitruk, P.; Matthaeus, W. H.
April 2006
Physics of Plasmas;Apr2006, Vol. 13 Issue 4, p042306
Academic Journal
A one-point closure model for energy decay in three-dimensional magnetohydrodynamic (MHD) turbulence is developed. The model allows for influence of a large-scale magnetic field that may be of strength sufficient to induce Alfvén wave propagation effects, and takes into account components of turbulence in which either the wave-like character is negligible or is dominant. This two-component model evolves energy and characteristic length scales, and may be useful as a simple description of homogeneous MHD turbulent decay. In concert with spatial transport models, it can form the basis for approximate treatment of low-frequency plasma turbulence in a variety of solar, space, and astrophysical contexts.


Related Articles

  • Forced magnetohydrodynamic turbulence in a uniform external magnetic field. Hossain, Murshed; Vahala, George; Montgomery, David // Physics of Fluids (00319171);Oct85, Vol. 28 Issue 10, p3074 

    Two-dimensional dissipative magnetohydrodynamic turbulence is randomly driven at small spatial scales and is studied by numerical simulation in the presence of a strong uniform external magnetic field. A novel behavior is observed which is apparently distinct from the inverse cascade that...

  • Weak and Strong MHD Turbulence. Gogoberidze, G.; Mahajan, S.; Poedts, S.; Akhalkatsi, M. // AIP Conference Proceedings;7/5/2011, Vol. 1356 Issue 1, p67 

    The general conditions for the weak and strong regimes of incompressible magnetohydrodynamic turbulence are derived and studied in the framework of the direct interaction approximation. It is shown that in the framework of the weak turbulence theory, the autocorrelation and cascade timescales...

  • Hydromagnetic Turbulent Flow Past A Semi-Infinite Vertical Plate Subjected To Heat Flux. Marigi, Emmah; Kinyanjui, Matthew; Kwanza, Jackson // Mathematical Theory & Modeling;2012, Vol. 2 Issue 8, p15 

    In this study we have investigated a turbulent flow of a rotating fluid past a semi-infinite vertical porous plate subjected to a constant heat flux. A variable magnetic field is applied transversely in the direction normal to the plate. An induced electric current known as Hall current exists...

  • Turbulent transport and equilibrium profiles in two-dimensional magnetohydrodynamics with background shear. Kim, Eun-jin; Dubrulle, Bérengere // Physics of Plasmas;Mar2001, Vol. 8 Issue 3, p813 

    Turbulent transport and equilibrium profile are studied in two-dimensional magnetohydrodynamics (2D MHD) in the presence of a background shear flow and a large-scale magnetic field; the latter quantities are assumed to be parallel and to vary in the perpendicular direction. The nonuniformity of...

  • Eddy viscosity and laminarization of sheared flow in three dimensional reduced magnetohydrodynamic turbulence. Kim, Eun-jin; Hahm, T. S.; Diamond, P. H. // Physics of Plasmas;Aug2001, Vol. 8 Issue 8 

    The effect of Alfve´n waves on turbulent momentum transport is studied in three-dimensional reduced magnetohydrodynamic turbulence. A strong external uniform magnetic field B[sub 0] is assumed to be present orthogonal to both background shear flow and its inhomogeneity. Energy is injected...

  • The timescales and heating efficiency of MHD wave-driven turbulence in an open magnetic region. Dmitruk, Pablo; Matthaeus, William H. // AIP Conference Proceedings;2003, Vol. 679 Issue 1, p347 

    Incompressible MHD waves propagating in a non-homogeneous background, with Alfven speed parallel gradients, can interact with their reflections producing a strong turbulent energy cascade to small perpendicular length scales. In an open magnetic region, with a strong background magnetic field,...

  • Hydromagnetic convection in a rotating annulus with an azimuthal magnetic field. Kurt, E.; Busse, F. H.; Pesch, W. // Theoretical & Computational Fluid Dynamics;Nov2004, Vol. 18 Issue 2-4, p251 

    The problem of convection induced by radial buoyancy in an electrically conducting fluid contained by a rotating cylindrical annulus (angular frequency, O) in the presence of a homogeneous magnetic field (B) in the azimuthal direction is considered. The small gap approximation is used together...

  • Current drive via magnetohydrodynamic helicity waves in a nonuniform plasma. Mett, Richard R.; Tataronis, John A. // Physics of Fluids B: Plasma Physics;Oct90, Vol. 2 Issue 10, p2334 

    Fundamentals of low-frequency current drive produced by a packet of arbitrarily polarized nonlinear Alfvén waves in an incompressible plasma with an inhomogeneous equilibrium magnetic field and aligned fluid velocity are explored. Analysis of the equations of magnetohydrodynamics with...

  • HYDROMAGNETIC DIVERGENT CHANNEL FLOW OF A VISCOELASTIC ELECTRICALLY CONDUCTING FLUID. Choudhury, Rita; Debnath, Kamal // International Journal of Engineering Science & Technology;2011, Vol. 3 Issue 10, p7556 

    A theoretical study for the two-dimensional boundary layer flow through a divergent channel of a visco-elastic electrically conducting fluid in presence of transverse magnetic field has been considered. Similarity solutions are obtained by considering a special form of magnetic field. The...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics