Modeling of the subgrid-scale term of the filtered magnetic field transport equation

Abstract : Accurate subgrid-scale turbulence models are needed to perform realistic numerical magnetohydrodynamic (MHD) simulations of the subsurface flows of the Sun. To perform large-eddy simulations (LES) of turbulent MHD flows, three unknown terms have to be modeled. As a first step, we propose to use {a priori} tests to measure the accuracy of various models proposed to predict the SGS term appearing in the transport equation of the filtered magnetic field. We then evaluate the SGS model accuracy in term of structural and functional performance, i.e. the model capacity to locally approximate the unknown term and to reproduce its energetic action, respectively. From our tests, it appears that a mixed model based on the scale-similarity model has better performance.
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https://hal.archives-ouvertes.fr/hal-00558579
Contributor : Guillaume Balarac <>
Submitted on : Saturday, January 22, 2011 - 12:51:07 PM
Last modification on : Thursday, February 7, 2019 - 4:14:49 PM
Long-term archiving on : Saturday, April 23, 2011 - 2:47:55 AM

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Guillaume Balarac, Alexander Kosovichev, Olivier Brugière, Alan Wray, Nagi Mansour. Modeling of the subgrid-scale term of the filtered magnetic field transport equation. Proceedings of the Summer Program 2010, 2010, Stanford, United States. ⟨hal-00558579⟩

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