Zobrazeno 1 - 10 of 52 pro vyhledávání: '"Franck Plunian"'
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Akademický článek
Axisymmetric dynamo action is possible with anisotropic conductivity
Autor: Franck Plunian, Thierry Alboussière
Publikováno v: Physical Review Research, Vol 2, Iss 1, p 013321 (2020)
A milestone of dynamo theory is Cowling's theorem, known in its modern form as the impossibility for an axisymmetric velocity field to generate an axisymmetric magnetic field by dynamo action. Using anisotropic electrical conductivity, we show that a
Externí odkaz: https://doaj.org/article/1fab31f01c4e4463a68bd583ea300853
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2
Fast and Furious dynamo action in the anisotropic dynamo
Autor: Franck Plunian, Thierry Alboussière
In the limit of large magnetic Reynolds numbers, it is shown that a smooth differential rotation can lead to fast dynamo action, provided that the electrical conductivity or magnetic permeability is anisotropic. If the shear is infinite, for example
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::868219aa8c354a165ea68ed92102e78a
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4
Axisymmetric dynamo action produced by differential rotation, with anisotropic electrical conductivity and anisotropic magnetic permeability
Autor: Franck Plunian, Thierry Alboussière
Publikováno v: Journal of Plasma Physics
Journal of Plasma Physics, 2021, 87, ⟨10.1017/S0022377820001634⟩
The effect on dynamo action of an anisotropic electrical conductivity conjugated to an anisotropic magnetic permeability is considered. Not only is the dynamo fully axisymmetric, but it requires only a simple differential rotation, which twice challe
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a22bee1e3b3ceeef1dc9399a7a55b543
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5
Inverse cascade of energy in helical turbulence
Autor: Andrei Teimurazov, Rodion Stepanov, Franck Plunian, Mahendra K. Verma
Using direct numerical simulation of hydrodynamic turbulence with helicity forcing applied at all scales, a near-maximum helical turbulent state is obtained, with an inverse energy cascade at scales larger than the energy forcing scale and a forward
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8530256545b749b2f5b2c73533a511b
http://arxiv.org/abs/2005.04701
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6
Dynamo action in sliding plates of anisotropic electrical conductivity
Autor: Kamel Drif, Franck Plunian, Thierry Alboussière
Publikováno v: Physical Review E
Physical Review E, American Physical Society (APS), 2020, 101 (3), ⟨10.1103/PhysRevE.101.033107⟩
Physical Review E, 2020, 101 (3), ⟨10.1103/PhysRevE.101.033107⟩
With materials of anisotropic electrical conductivity, it is possible to generate a dynamo with a simple velocity field, of the type precluded by Cowling's theorems with isotropic materials. Following a previous study by Ruderman and Ruzmaikin [1] wh
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b302b8e1128dd7743b451476e5b24f6
http://arxiv.org/abs/2004.12244
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7
Enstrophy transfers in helical turbulence
Autor: Roshan Samuel, Ravi Samtaney, Rodion Stepanov, Franck Plunian, Shubhadeep Sadhukhan, Mahendra K. Verma
In this paper we study the enstrophy transers in helical turbulence using direct numerical simulation. We observe that the helicity injection does not have significant effects on the inertial-range energy and helicity spectra ($\sim k^{-5/3}$) and fl
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aeab7c3195e954fe66924e33368c4444
http://arxiv.org/abs/2004.10621
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8
On uniqueness of transfer rates in magnetohydrodynamic turbulence
Autor: Rodion Stepanov, Franck Plunian, Mahendra K. Verma
In hydrodynamic and magnetohydrodynamic turbulence, expressions for the transfer rates rely on integrals over wavenumber triads $(\textbf{k,p,q})$ satisfying $\textbf{k+p+q=0}$. As an example $S_E^{uu}(\textbf{k|p,q})$ denotes the kinetic energy tran
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bb5e16d3d9a3bafd73ee3fee3426a77a
http://arxiv.org/abs/2004.10107
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9
Axisymmetric dynamo action is possible with anisotropic conductivity
Autor: Thierry Alboussière, Franck Plunian
Publikováno v: Physical Review Research
Physical Review Research, American Physical Society, 2020, 2 (1), ⟨10.1103/PhysRevResearch.2.013321⟩
Physical Review Research, 2020, 2 (1), ⟨10.1103/PhysRevResearch.2.013321⟩
A milestone of dynamo theory is Cowling's theorem, known in its modern form as the impossibility for an axisymmetric velocity field to generate an axisymmetric magnetic field by dynamo action. Using an anisotropic electrical conductivity we show that
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c404644217e748b504e0dabd750a789
https://hal.archives-ouvertes.fr/hal-03086303
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10
Direct Numerical Simulation of Helical Magnetohydrodynamic Turbulence with TARANG Code
Autor: Abhishek Kumar, Franck Plunian, Rodion Stepanov, Andrei Teimurazov, Valerij Titov, Satyajit Barman, Mahendra K. Verma
Publikováno v: 2017 Ivannikov ISPRAS Open Conference (ISPRAS).
Magnetohydrodynamic (MHD) turbulence is an intrinsic part of astrophysical phenomena, which plays a crucial role is the generation of cosmic magnetic fields. The two-scale dynamo concept suggests that the small scale interactions are demanded to driv
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::49b3aae29cda63133442dbf5b66fa83b
https://doi.org/10.1109/ispras.2017.00022
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