Zobrazeno 1 - 10
of 75
pro vyhledávání: '"Gama, Sílvio"'
To advance our understanding of the magnetohydrodynamic (MHD) processes in liquid metals, in this paper we propose an approach combining the classical methods in the dynamo theory based on numerical simulations of the partial differential equations g
Externí odkaz:
http://arxiv.org/abs/2407.17627
In a system of point vortices, there exist regions of stability around each vortex, even if the system is chaotic. These regions are usually called stability islands and they have a morphology that is hard to characterise. We study and characterise t
Externí odkaz:
http://arxiv.org/abs/2307.13478
We present a novel method for estimating the circulations and positions of point vortices using trajectory data of passive particles in the presence of Gaussian noise. The method comprises two algorithms: the first one calculates the vortex circulati
Externí odkaz:
http://arxiv.org/abs/2305.02737
In this work, a multifractal framework is proposed to investigate the effects of current sheets in solar wind turbulence. By using multifractal detrended fluctuation analysis coupled with surrogate methods and volatility, two solar wind magnetic fiel
Externí odkaz:
http://arxiv.org/abs/2301.02118
Publikováno v:
Fluids, Vol. 4, Iss. 2, 110, 2019
We present examples of Pad\'e approximation of the $\alpha$-effect and eddy viscosity/diffusivity tensors in various flows. Expressions for the tensors derived in the framework of the standard multiscale formalism are employed. Algebraically the simp
Externí odkaz:
http://arxiv.org/abs/1906.01423
Publikováno v:
European Physical Journal E 42 (1), 10: 1-8 (2019)
We analyze the evolution of the distribution, both in the phase space and in the physical space, of inertial particles released by a spatially-localized (punctual) source and advected by an incompressible flow. The difference in mass density between
Externí odkaz:
http://arxiv.org/abs/1804.00186
Publikováno v:
Phys. Rev. Fluids 3, 044501 (2018)
We investigate the large-scale transport properties of quasi-neutrally-buoyant inertial particles carried by incompressible zero-mean periodic or steady ergodic flows. We show how to compute large-scale indicators such as the inertial-particle termin
Externí odkaz:
http://arxiv.org/abs/1712.10049
Publikováno v:
C. R. M\'ecanique 346, 121-131 (2018)
We investigate the sedimentation properties of quasi-neutrally buoyant inertial particles carried by incompressible zero-mean fluid flows. We obtain generic formulae for the terminal velocity in generic space-and-time periodic (or steady) flows, alon
Externí odkaz:
http://arxiv.org/abs/1712.01171
Publikováno v:
Journal of Statistical Mechanics: Theory and Experiment, 103205, pp. 1-17 (10\)(2016)
We analytically investigate the effective-diffusivity tensor of a tracer particle in a fluid flow endowed with a short correlation time. By means of functional calculus and a multiscale expansion, we write down the main contributions to the eddy diff
Externí odkaz:
http://arxiv.org/abs/1606.04812
Publikováno v:
In Comptes rendus - Mécanique February 2018 346(2):121-131
