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

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

2010-10-27

arxiv.org/abs/1010.5759v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 5 figures; Center for Turbulence Research, Proceedings of the Summer Program 2010, Stanford University

Scientific paper

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, this work proposes 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. It is proposed to 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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