Physics – Fluid Dynamics
Scientific paper
2008-03-31
Physics
Fluid Dynamics
10 pages, 13 figures
Scientific paper
10.1103/PhysRevE.78.026310
We present a dynamical spectral model for Large Eddy Simulation of the incompressible magnetohydrodynamic (MHD) equations based on the Eddy Damped Quasi Normal Markovian approximation. This model extends classical spectral Large Eddy Simulations for the Navier-Stokes equations to incorporate general (non Kolmogorovian) spectra as well as eddy noise. We derive the model for MHD and show that introducing a new eddy-damping time for the dynamics of spectral tensors in the absence of equipartition between the velocity and magnetic fields leads to better agreement with direct numerical simulations, an important point for dynamo computations.
Baerenzung Julien
Politano Helene
Ponty Yannick
Pouquet Annick
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