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Energy transfers for Large Eddy Simulations of magnetohydrodynamic turbulence

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Our goal is to use Large Eddy Simulation (LES) to simulate forced magnetohydrodynamic (MHD) turbulence at Reynolds numbers (kinetic and magnetic) higher than those used in direct numerical simulation (DNS). As a first step we test several subgrid scale models against DNS by comparing the energy transfers between the filtered and subgrid scales. For an eddy diffusivity model we find that the effect of the forcing type, helical or not, is crucial, suggesting that helicity should be taken into account in MHD LES models.

Author(s):

Mouloud Kessar    
Laboratoire des Ecoulements Géophysiques et Industriels (LEGI),ISTerre,INPG
France

Guillaume Balarac    
LEGI, INPG
France

Franck Plunian    
Institut des Sciences de la Terre(ISTerre), UJF
France