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| Titel |
Energy dissipation in three-dimensional kinetic simulations of relaxing turbulence |
| VerfasserIn |
Vyacheslav Olshevsky, Sergio Servidio, Leonardo Primavera, Francesco Pucci, Giovanni Lapenta |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250147690
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| Publikation (Nr.) |
 EGU/EGU2017-11890.pdf |
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| Zusammenfassung |
| We investigate the non-universality of turbulence in magnetized plasmas at the kinetic scales.
We compute the power spectra in the kinetic particle-in-cell simulations of the Taylor-Green
vortex with the superimposed magnetic fields. Three different configurations of the magnetic
field having the same initial energies are studied. There is no external forcing, the evolution
of the symmetric large-scale vortices starts abruptly due to the pressure imbalance. Maximum
dissipation is observed after a few turnover times, much shorter than the Alfvén time or the
ion gyration time. At this moment, power spectra are well established in all three magnetic
configurations with the inertial range settled right between the ion and the electron scales.
However, in two cases they have the slopes close to -2.7, while in the third case
magnetic fluctuations show a steeper slope of -3.3, and the kinetic energy spectrum is
milder with the slope of -2.4. The unsimilarities in the power spectra expose the
intrinsic role of the magnetic field in the turbulent energy dissipation at kinetic scales. |
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