Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Alboussière, Thierry"'
The ubiquitous phenomena of crystallization and melting occur in various geophysical contexts across many spatial and temporal scales. In particular, they take place in the iron core of terrestrial planets and moons, profoundly influencing their dyna
Externí odkaz:
http://arxiv.org/abs/2410.08685
Autor:
Ricard, Yanick, Alboussière, Thierry
The radial density of planets increases with depth due to compressibility, leading to impacts on their convective dynamics. To account for these effects, including the presence of a quasi-adiabatic temperature profile and entropy sources due to dissi
Externí odkaz:
http://arxiv.org/abs/2303.15153
Publikováno v:
Alboussiere, T., Curbelo, J., Dubuffet, F., Labrosse, S., & Ricard, Y. (2022). A playground for compressible natural convection with a nearly uniform density. Journal of Fluid Mechanics, 940, A9, 2022
In the quest to understand the basic universal features of compressible convection, one would like to disentangle genuine consequences of compression from spatial variations of transport properties. In the present work, we consider a very peculiar eq
Externí odkaz:
http://arxiv.org/abs/2211.11471
Autor:
Plunian, Franck, Alboussière, Thierry
Publikováno v:
Journal of Fluid Mechanics, Volume 941, 25 June 2022, A66
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:
http://arxiv.org/abs/2207.03950
We report measurements of dynamo action in a new experimental setup, named Fury, based on the use of an anisotropic electrical conductivity. It consists in a copper rotor rotating inside a copper stator, electrically connected with a thin layer of li
Externí odkaz:
http://arxiv.org/abs/2206.00063
Autor:
Plunian, Franck, Alboussière, Thierry
Publikováno v:
Journal of Plasma Physics, 87(1), 905870110 (2021)
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:
http://arxiv.org/abs/2102.04343
Autor:
Pothérat, Alban, Alboussière, Thierry
Publikováno v:
Phys. Fluids, 15 (10), 1370-1380 (2003)
In this paper, we derive estimates for size of the small scales and the attractor dimension in low $Rm$ magnetohydrodynamic turbulence by deriving a rigorous upper bound of the dimension of the attractor representing this flow. To this end, we find a
Externí odkaz:
http://arxiv.org/abs/2006.06235
Autor:
Pothérat, Alban, Alboussière, Thierry
Publikováno v:
Magnetohydrodynamics 39, No. 3, 229-236, 2003
The aim of the present work is to derive rigorous estimates for turbulent MHD flow quantities such as the size and anisotropy of the dissipative scales, as well as the transition between 2D and 3D state. To this end, we calculate an upper bound for t
Externí odkaz:
http://arxiv.org/abs/2006.05343
Autor:
Pothérat, Alban, Alboussière, Thierry
Publikováno v:
Phys. Fluids, 18 (12), 125102 (2006)
Steady Low $R_m$ MHD turbulence is investigated here through estimates of upper bounds for attractor dimension. A flow between two parallel walls with an imposed perpendicular magnetic field is considered. The flow is defined by its maximum velocity
Externí odkaz:
http://arxiv.org/abs/2006.03881
Publikováno v:
Phys. Rev. E 101, 033107, 2020
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:
http://arxiv.org/abs/2004.12244