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Accueil > Séminaires et conférences > Séminaires, soutenances de thèses et HDR précédents > 2011 > Séminaires 2011 > Le mardi 15 février à 14h

Le mardi 15 février à 14h

Cristian-Constantin LALESCU, Plasma and Statistical Physics Laboratory, Université Libre de Bruxelles) - Particle tracking in turbulent fields

le mardi 15 février à 14h, en salle de réunion du Centre de physique théorique (CPHT), campus de l’Ecole Polytechnique, Palaiseau.

A general numeric approach is proposed to follow particle trajectories in the presence of turbulent fields. Although the
method can be adapted to a wide variety of physical problems, its application is focused here on the study of charged particle
transport in turbulent plasmas. The major difficulty of the method is to combine the simulation of Lagrangian particle trajectories with the Eulerian computation of the turbulent fields that influence the particle motion. The particular case of charged particles submitted to turbulent electromagnetic fields generated on a grid by a nonlinear magnetohydrodynamic (MHD) solver will be discussed. The interplay between the Lagrangian particle trajectory solver and the interpolation scheme needed for estimating the turbulent fields between the grid points will be emphasized. The MHD flow that has been retained corresponds to the Kolmogorov forcing. The flow is driven by a constant force acting
in one direction and varying periodically in space in a direction
perpendicular to itself. Such a flow will be shown to develop a turbulent regime with long-standing large-scale structures. Transport properties, such as the mean squared displacements and probability density functions, of charged particles in the Kolmogorov flow will be presented.


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Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Pascal Chabert (Directeur)