Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ptep.proc..197g&link_type=abstract
Plasma Turbulence and Energetic Particles in Astrophysics, Proceedings of the International Conference, Cracow (Poland), 5-10 Se
Astronomy and Astrophysics
Astrophysics
Scientific paper
Intermittency in fully turbulent hydro- and magnetohydrodynamic flows is still a fascinating but unsolved problem. Recently, remarkable progress has been achieved in a model system of turbulence, the so-called Burgers turbulence. The most striking feature is that the tails of the probability distribution of velocity increments could be calculated using information of the pre-shocks present in the flow. The situation is expected to be similar in the Navier-Stokes and MHD equations, where vortex tubes or current sheets may substitute the role of pre-shocks of the Burgers equation. Numerical simulations using structured adaptive mesh refinement are presented to study the evolution of the singular structures in ideal equations without dissipation.
Grauer Rainer
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