Results 21 to 30 of about 257,752 (298)

MEMORY EFFECTS IN TURBULENT TRANSPORT [PDF]

The Astrophysical Journal, 2009
In the mean-field theory of magnetic fields, turbulent transport, i.e. the turbulent electromotive force, is described by a combination of the alpha effect and turbulent magnetic diffusion, which are usually assumed to be proportional respectively to the mean field and its spatial derivatives.
Hubbard, A., Brandenburg, A.
openaire   +2 more sources

Turbulence-driven vortex-flow around a magnetic island

Nuclear Fusion, 2023
We predict a new state of plasma self-organization, in the presence of magnetic islands, namely turbulence-driven island vortex-flows, which are non-axisymmetric flows.
M. Leconte, Y.W. Cho
doaj   +1 more source

Cosmic-ray Transport in Magnetohydrodynamic Turbulence

The Astrophysical Journal, 2022
Abstract This paper studies cosmic-ray (CR) transport in magnetohydrodynamic (MHD) turbulence. CR transport is strongly dependent on the properties of the magnetic turbulence. We perform test particle simulations to study the interactions of CR with both total MHD turbulence and decomposed MHD modes.
Snehanshu Maiti, Kirit Makwana, Heshou Zhang, Huirong Yan   +3 more
openaire   +5 more sources

Statistical Conservation Laws in Turbulent Transport [PDF]

Physical Review Letters, 2001
We address the statistical theory of fields that are transported by a turbulent velocity field, both in forced and in unforced (decaying) experiments. We propose that with very few provisos on the transporting velocity field, correlation functions of the transported field in the forced case are dominated by statistically preserved structures.
Arad, I., Biferale, L., Celani, A., Procaccia, I., Vergassola, M.   +4 more
openaire   +3 more sources

Self-sustained biphasic catalytic particle turbulence

Nature Communications, 2019
Turbulent systems are particularly suitable for heat transport. Here the authors add active particles to a turbulent system, and the coupling of turbulent convection and the collective dynamics of active particles leads to a 500% enhancement in heat ...
Ziqi Wang, Varghese Mathai, Chao Sun
doaj   +1 more source

GTC simulation of turbulence transport at internal transport barrier of HL-2M tokamak

He jishu
BackgroundHL-2M tokamak is a new-generation magnetic confinement fusion plasma device in China, which has realized the high parameter operation mode with 1 MA plasma current.PurposeThis study aims to investigate the turbulent transport associated with ...
XIAO Zhengyao, LI Xinxia, WANG Sen
doaj   +1 more source

A Quantitative Scaling Theory for Meridional Heat Transport in Planetary Atmospheres and Oceans

AGU Advances, 2021
The meridional temperature profile of the upper layers of planetary atmospheres is set through a balance between differential radiative heating by a nearby star, or by intrinsic heat fluxes emanating from the deep interior, and the redistribution of that
Basile Gallet, Raffaele Ferrari
doaj   +1 more source

Thermal Equilibrium Curves and Turbulent Mixing in Keplerian Accretion Disks [PDF]

, 1999
We consider vertical heat transport in Keplerian accretion disks, including the effects of radiation, convection, and turbulent mixing driven by the Balbus-Hawley instability, in astronomical systems ranging from dwarf novae (DNe), and soft X-ray ...
Batchelor G.K., Canuto V. M., Cox A. N., Ethan T. Vishniac, Honma F., John K. Cannizzo, Kazantsev A. P., Livio M., Ludwig K., Maeder A., Maeder A., Meyer F., Mineshige S., Mineshige S., Pin‐Gao Gu, Pojmanski G., Rudiger C., Schittkowski K., Shakura N. I., Smak J., Speziale C. G., Talon S., Velikhov E. P., Wood J. H., Zahn J.-P.   +24 more
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Turbulence Suppression in Transport Barriers

Fusion Science and Technology, 2004
Basic facts about transport barriers in toroidally confined plasmas are presented. The flow shear of poloidal plasma rotation is a common feature in the spontaneous and induced transport barriers as well and is considered as the basic cause of their formation. Basic ideas on the impact of flow shear on the radial transport are discussed.
Reiser, D., Tokar, M. Z.
openaire   +2 more sources

Effective diffusivity of passive scalars in rotating turbulence [PDF]

, 2013
We use direct numerical simulations to compute turbulent transport coefficients for passive scalars in turbulent rotating flows. Effective diffusion coefficients in the directions parallel and perpendicular to the rotations axis are obtained by studying ...
Imazio, P. Rodriguez, Mininni, P. D.
core   +2 more sources