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Numerical Study of Dynamo Action at Low Magnetic Prandtl Numbers

Yannick Ponty 1 Pablo Mininni 2 David Montgomery 3 Jean-François Pinton 4 Hélène Politano 1 Annick Pouquet 2
1 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
2 NCAR - National Center for Atmospheric Research [Boulder]
3 Department of Physics and Astronomy [Hanover]
4 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
Abstract : We present a three-pronged numerical approach to the dynamo problem at low magnetic Prandtl numbers PM . The difficulty of resolving a large range of scales is circumvented by combining direct numerical simulations, a Lagrangian-averaged model and large-eddy simulations. The flow is generated by the Taylor-Green forcing; it combines a well defined structure at large scales and turbulent fluctuations at small scales. Our main findings are (i) dynamos are observed from PM ≈
Keywords : Magnetic fields Dynamo
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Submitted on : Friday, October 19, 2007 - 5:00:52 PM
Last modification on : Tuesday, May 26, 2020 - 6:50:17 PM
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  • HAL Id : ensl-00180691, version 1

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Yannick Ponty, Pablo Mininni, David Montgomery, Jean-François Pinton, Hélène Politano, et al.. Numerical Study of Dynamo Action at Low Magnetic Prandtl Numbers. Physical Review Letters, American Physical Society, 2005, pp.164502. ⟨ensl-00180691⟩

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