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Large-Eddy Simulations of Magnetohydrodynamic Turbulence in Heliophysics and Astrophysics
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA.ORCID iD: 0000-0002-7304-021X
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2015 (English)In: Space Science Reviews, ISSN 0038-6308, E-ISSN 1572-9672Article in journal (Refereed) Published
Abstract [en]

We live in an age in which high-performance computing is transforming the way we do science. Previously intractable problems are now becoming accessible by means of increasingly realistic numerical simulations. One of the most enduring and most challenging of these problems is turbulence. Yet, despite these advances, the extreme parameter regimes encountered in space physics and astrophysics (as in atmospheric and oceanic physics) still preclude direct numerical simulation. Numerical models must take a Large Eddy Simulation (LES) approach, explicitly computing only a fraction of the active dynamical scales. The success of such an approach hinges on how well the model can represent the subgrid-scales (SGS) that are not explicitly resolved. In addition to the parameter regime, heliophysical and astrophysical applications must also face an equally daunting challenge: magnetism. The presence of magnetic fields in a turbulent, electrically conducting fluid flow can dramatically alter the coupling between large and small scales, with potentially profound implications for LES/SGS modeling. In this review article, we summarize the state of the art in LES modeling of turbulent magnetohydrodynamic (MHD) flows. After discussing the nature of MHD turbulence and the small-scale processes that give rise to energy dissipation, plasma heating, and magnetic reconnection, we consider how these processes may best be captured within an LES/SGS framework. We then consider several specific applications in heliophysics and astrophysics, assessing triumphs, challenges, and future directions.

Place, publisher, year, edition, pages
Springer Netherlands, 2015.
Keyword [en]
Magnetohydrodynamics, Simulation, Turbulence, Astrophysics, Computational fluid dynamics, Energy dissipation, Flow of fluids, Magnetism, Magnetoplasma, Numerical models, Space research, Astrophysical applications, Electrically conducting fluids, High performance computing, Magnetic reconnections, Magnetohydrodynamic flows, Magnetohydrodynamic turbulence, Small-scale process, Large eddy simulation
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-176178DOI: 10.1007/s11214-015-0190-7ISI: 000365511500002ScopusID: 2-s2.0-84948079546OAI: diva2:867755

QC 20151106

Available from: 2015-11-06 Created: 2015-11-02 Last updated: 2016-01-07Bibliographically approved

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Brandenburg, Axel
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