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Abstract: We present a dynamical spectral model for Large Eddy Simulation of theincompressible magnetohydrodynamic MHD equations based on the Eddy DampedQuasi Normal Markovian approximation. This model extends classical spectralLarge Eddy Simulations for the Navier-Stokes equations to incorporate generalnon Kolmogorovian spectra as well as eddy noise. We derive the model for MHDand show that introducing a new eddy-damping time for the dynamics of spectraltensors in the absence of equipartition between the velocity and magneticfields leads to better agreement with direct numerical simulations, animportant point for dynamo computations.



Author: J. Baerenzung, H. Politano, Y. Ponty, A. Pouquet

Source: https://arxiv.org/



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