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Effect of subgrid scale turbulence on particle acceleration in solar wind turbulence

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In this work we analyse the role of small scale turbulent structures on the acceleration of charged particles in MHD flows in astrophysical relevant conditions. We compare the particle trajectories and statistics obtained from high resolution direct numerical simulations (DNS) and those obtained in filtered versions of these DNS fields. The filtered fields are obtained by applying a sharp Fourier cut-off on the DNS fields and represent “ideal" fields in the context of the comparison with results obtained through the large-eddy-simulation (LES) technique. All simulations are performed using a pseudo-spectral code in a cubic domain with periodic boundary conditions.

Author(s):

Bernard Knaepen    
Université Libre de Bruxelles
Belgium

Lapo Bettarini    
Université Libre de Bruxelles
Belgium