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of 231
pro vyhledávání: '"Alexakis, Alexandros"'
Explaining fast magnetic reconnection in electrically conducting plasmas has been a theoretical challenge in plasma physics since its first description by Eugene N. Parker. In the recent years the observed reconnection rate has been shown by numerica
Externí odkaz:
http://arxiv.org/abs/2406.08951
It has long been conjectured that, in three dimensional turbulence, velocity modes at scales larger than the forcing scale follow equilibrium dynamics. Recent numerical and experimental evidence show that such modes share the same mean energy and the
Externí odkaz:
http://arxiv.org/abs/2311.14440
Autor:
Ajzner, Ben, Alexakis, Alexandros
Reproducing complex phenomena with simple models marks our understanding of the phenomena themselves and this is what Jack Herring's work demonstrated multiple times. In that spirit, this work studies a turbulence shell model consisting of a hierarch
Externí odkaz:
http://arxiv.org/abs/2307.15505
Autor:
Alexakis, Alexandros
How locally injected turbulence, spreads in space is investigated with direct numerical simulations. We consider a turbulent flow in a long channel generated by a forcing that is localised in space. The forcing is such that it does not inject any mea
Externí odkaz:
http://arxiv.org/abs/2307.08469
Autor:
Alexakis, Alexandros, Chibbaro, Sergio
Using highly resolved direct numerical simulations we examine the statistical properties of the local energy flux rate $\Pi_\ell(x)$ towards small scales for three isotropic turbulent magnetohydrodynamic flows, which differ in strength and structure
Externí odkaz:
http://arxiv.org/abs/2207.12335
We demonstrate that like in the forward cascade of three dimensional turbulence that displays intermittency (lack of self-similarity) due to the concentration of energy dissipation in a small set of fractal dimension less than three, the inverse casc
Externí odkaz:
http://arxiv.org/abs/2206.02657
The presence of large scale magnetic fields in nature is often attributed to the inverse cascade of magnetic helicity driven by turbulent helical dynamos. In this work we show that in turbulent helical dynamos, the inverse flux of magnetic helicity t
Externí odkaz:
http://arxiv.org/abs/2204.14091
In many geophysical and astrophysical flows, suppression of fluctuations along one direction of the flow drives a quasi-2D upscale flux of kinetic energy, leading to the formation of strong vortex condensates at the largest scales. Recent studies hav
Externí odkaz:
http://arxiv.org/abs/2201.00278
Autor:
Alexakis, Alexandros, Biferale, Luca
We investigate numerically the model proposed in Sahoo et al [Phys. Rev. Lett. 118, 164501, (2017)] where a parameter $\lambda$ is introduced in the Navier-Stokes equations such that the weight of homochiral to heterochiral interactions is varied whi
Externí odkaz:
http://arxiv.org/abs/2109.01073
Autor:
van Kan, Adrian, Alexakis, Alexandros
We study forced, rapildy rotating and stably stratified turbulence in an elongated domain using an asymptotic expansion at simultaneously low Rossby number $Ro\ll1$ and large domain height compared to the energy injection scale, $h=H/\ell_{in}\gg1$.
Externí odkaz:
http://arxiv.org/abs/2106.06973