Laboratory Dynamo Experiments

Verhille, Gautier; Plihon, Nicolas; Bourgoin, Mickaël; Odier, Philippe; Pinton, Jean‐François

doi:10.1007/s11214-009-9546-1

Cited by 29 publications

(18 citation statements)

References 82 publications

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“…To unveil the key features of geo-and astrophysical flows, the modern laboratory experiments emphasize the exploration of strongly forced regimes (see e.g. [6,22,30,47]). Under strong forcing, the purely viscous mechanism of momentum transfer by thermal molecular motion is replaced by momentum transfer due to vortices and/or waves.…”

Section: Introductionmentioning

confidence: 99%

Scale effects in internal wave attractors

et al. 2017

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As a necessary preliminary step toward geophysically significant extrapolations, we study the scale effects in internal wave attractors in the linear and nonlinear regimes. We use two geometrically similar experimental set-ups, scaled to factor 3, and numerical simulations (a spectral element method, based on the Nek5000 open solver) for a range of parameters that is typically accessible in laboratory. In the linear regime, we recover the classical viscous scaling for the beam width, which is not affected by variations of the amplitude of the input perturbation. In the nonlinear regime, we show that the scaling of the width-to-length ratio of the attractor branches is intimately related with the energy cascade from large-scale energy input to dissipation. We present results for the wavelength, amplitude and width of the beam as a function of time and as a function of the amplitude of the forcing. * Thierry.Dauxois@ens-lyon.fr 1 arXiv:1805.04560v1 [physics.flu-dyn]

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Section: Introductionmentioning

confidence: 99%

Scale effects in internal wave attractors

et al. 2017

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“…Even though MHD turbulence is very widespread in the universe, we have practically no direct experience of it in our daily pursuits. Laboratory experiments can be conducted but they are, in general difficult to perform, and difficult to diagnose (Verhille et al 2009). As a result, MHD theorists have enjoyed a greater creative freedom and have expressed it by generating an impressive array of competing theories; computer simulations being the only obstacle standing in the way of the expression of unbounded imagination.…”

Section: Introductionmentioning

confidence: 99%

MHD Dynamos and Turbulence

Tobias

Cattaneo

Boldyrev

2012

Ten Chapters in Turbulence

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“…Although running such experiments is very challenging, a number of teams now have operational set-ups that have already brought very interesting results (see the recent reviews of Verhille et al 2009). Some of these have succeeded at producing magnetic fields from energy drawn from conducting fluids.…”

Section: Discussionmentioning

confidence: 99%

The Magnetic Field of Planet Earth

et al. 2010

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The magnetic field of the Earth is by far the best documented magnetic field of all known planets. Considerable progress has been made in our understanding of its characteristics and properties, thanks to the convergence of many different approaches and to the remarkable fact that surface rocks have quietly recorded much of its history. The usefulness of magnetic field charts for navigation and the dedication of a few individuals have also led to the patient construction of some of the longest series of quantitative observations in the history of science. More recently even more systematic observations have been made possible from space, leading to the possibility of observing the Earth's magnetic field in much more details than was previously possible. The progressive increase in computer power was also crucial, leading to advanced ways of handling and analyzing this considerable corpus G. Hulot ( ) G. Hulot et al. of data. This possibility, together with the recent development of numerical simulations, has led to the development of a very active field in Earth science. In this paper, we make an attempt to provide an overview of where the scientific community currently stands in terms of observing, interpreting and understanding the past and present behavior of the so-called main magnetic field produced within the Earth's core. The various types of data are introduced and their specific properties explained. The way those data can be used to derive the time evolution of the core field, when this is possible, or statistical information, when no other option is available, is next described. Special care is taken to explain how information derived from each type of data can be patched together into a consistent description of how the core field has been behaving in the past. Interpretations of this behavior, from the shortest (1 yr) to the longest (virtually the age of the Earth) time scales are finally reviewed, underlining the respective roles of the magnetohydodynamics at work in the core, and of the slow dynamic evolution of the planet as a whole.

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Laboratory Dynamo Experiments

Cited by 29 publications

References 82 publications

Scale effects in internal wave attractors

Scale effects in internal wave attractors

MHD Dynamos and Turbulence

The Magnetic Field of Planet Earth

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