Anisotropy and intermittency of quasi-static magnetohydrodynamic (MHD) turbulence in an
imposed magnetic field are examined, using three-dimensional orthonormal wavelet analysis.
Wavelets are an efficient tool to examine directional scale-dependent statistics, since
they are based on well-localized functions in space, scale and direction. The analysis is
applied to two turbulent MHD flows computed by direct numerical simulation with
512 grid points...
A new numerical scheme called particle-in-wavelets is proposed for the Vlasov-Poisson
equations, and tested in the simplest case of one spatial dimension. The plasma
distribution function is discretized using tracer particles, and the charge distribution
is reconstructed using wavelet-based density estimation. The latter consists in projecting
the Delta distributions corresponding to the particles onto a finite dimensional linear
space spanned by...
The Lagrangian statistics in rotating Saint-Venant turbulence are studied by means of
direct numerical simulation using a pseudo-spectral discretization fully resolving, both
in time and space, all the inertio-gravity waves present in the system. To understand the
influence of waves, three initial conditions are considered, one which is dominated by
waves, one which is dominated by vortices, and one which is intermediate between these two
extreme...
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