Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Bogdan Teaca"'
Publikováno v:
AIP Advances, Vol 7, Iss 11, Pp 115213-115213-10 (2017)
The role of the phase dynamics in turbulence is investigated. As a demonstration of the importance of the phase dynamics, a simplified system is used, namely the one-dimensional Burgers equation, which is evolved numerically. The system is forced via
Externí odkaz:
https://doaj.org/article/67ff81b0c180494892bcefa861dcf2bf
Publikováno v:
New Journal of Physics, Vol 19, Iss 4, p 045001 (2017)
Using large resolution numerical simulations of gyrokinetic (GK) turbulence, spanning an interval ranging from the end of the fluid scales to the electron gyroradius, we study the energy transfers in the perpendicular direction for a proton–electro
Externí odkaz:
https://doaj.org/article/6eaf69d37e8b44d1869a524fdf017825
Publikováno v:
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 381
The self-organization of structures in a tokamak plasma as it undergoes an H -mode transition shows properties similar to simpler shear flow configurations. We will describe recent dynamical studies of plasma shear flows, including the idea of tracki
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1fce3c922ac72106b2cc72be51e3319f
https://doi.org/10.1098/rsta.2021.0238
https://doi.org/10.1098/rsta.2021.0238
Autor:
Evgeny A. Gorbunov, Bogdan Teaca
For a magnetised plasma in a straight magnetic guide field, we derive a set of four-dimensional kinetic equations, which can capture electromagnetic turbulence in the drift kinetic limit. To do so, we start from the gyrokinetic equations, employ a La
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f1197434444a100d5d57fdc5c460257
http://arxiv.org/abs/2109.01179
http://arxiv.org/abs/2109.01179
Publikováno v:
Journal of Plasma Physics
In the present paper, we use a coarse-graining approach to investigate the nonlinear redistribution of free energy in both position and scale space for weakly collisional magnetised plasma turbulence. For this purpose, we use high-resolution numerica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b466feb5098ac89bf266e2d46ebc8f0d
https://hdl.handle.net/21.11116/0000-0008-4CE7-F21.11116/0000-0008-344D-821.11116/0000-0008-344F-6
https://hdl.handle.net/21.11116/0000-0008-4CE7-F21.11116/0000-0008-344D-821.11116/0000-0008-344F-6
Publikováno v:
Journal of Plasma Physics
In tokamak plasmas, sheared flows perpendicular to the driving temperature gradients can strongly stabilise linear modes. While the system is linearly stable, regimes with persistent nonlinear turbulence may develop, i.e. the system is subcritical. A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c5a94c8c7e0703d570a519bca0df98cf
http://arxiv.org/abs/1802.08519
http://arxiv.org/abs/1802.08519
In many plasma systems, introducing a small background shear flow is enough to stabilize the system linearly. The nonlinear dynamics are much less sensitive to sheared flows than the average linear growthrates, and very small amplitude perturbations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::35888429493fcf0aeea7bf52d3673e8a
Autor:
Frank Jenko, Alejandro Banon Navarro, Tobias Görler, David Hatch, Gabriel G. Plunk, Bogdan Teaca, Daniel Told
Publikováno v:
The Astrophysical Journal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c6e36f51c310beac4fe3e57f587a481
https://doi.org/10.3847/1538-4357/ab4a02
https://doi.org/10.3847/1538-4357/ab4a02
Publikováno v:
Journal of Computational Physics. 241:546-557
A class of numerical schemes is developed for the study of charged particle transport in complex stationary electromagnetic fields and tested for fields obtained from a numerical solution of the magneto-hydrodynamic equation. The performances of thes
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70cba546eb45ddd58d3db05a74902313
https://doi.org/10.1016/j.jcp.2011.10.011
https://doi.org/10.1016/j.jcp.2011.10.011
Autor:
D. Told, Bogdan Teaca, Frank Jenko, Alejandro Banon Navarro, Daniel Grošelj, Paul H. Crandall
Publikováno v:
Physical Review Letters
We analyze plasma heating in weakly collisional kinetic Alfv\'en wave (KAW) turbulence using high resolution gyrokinetic simulations spanning the range of scales between the ion and the electron gyroradii. Real space structures that have a higher tha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fc8be74549cfbbaedc4cd9eb1c727120
https://hdl.handle.net/11858/00-001M-0000-002C-39FB-D11858/00-001M-0000-002C-39FD-911858/00-001M-0000-002C-E197-5
https://hdl.handle.net/11858/00-001M-0000-002C-39FB-D11858/00-001M-0000-002C-39FD-911858/00-001M-0000-002C-E197-5