Abstract
The performance of different dynamic gradient-diffusion type subgridmodels is evaluated in large-eddy simulations (LES) of magnetohydrodynamic (MHD) turbulence with a maximum of 643 collocation points. The reference data stems from high-resolution direct numerical simulations of decaying and forced MHD turbulence with up to 5123 spectral modes. In addition direct divergence modeling and the effects of additional explicit Gaussian filtering in combination with a tensor-diffusivity term are considered. A new genuine MHD subgrid model, based on the cross-helicity invariant, is presented and observed to perform extraordinarily well.
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© 2001 Springer Science+Business Media Dordrecht
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Müller, WC., Carati, D. (2001). A New Approach Towards Subgrid Modeling in Magnetohydrodynamic Turbulence. In: Geurts, B.J., Friedrich, R., Métais, O. (eds) Direct and Large-Eddy Simulation IV. ERCOFTAC Series, vol 8. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-1263-7_28
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DOI: https://doi.org/10.1007/978-94-017-1263-7_28
Publisher Name: Springer, Dordrecht
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