Events in Physics
Joanne Mason (University of Exeter): The large and small scales of incompressible fieldguided MHD turbulence

Incompressible magnetohydrodynamics (MHD) provides the simplest theoretical framework for understanding magnetised plasma turbulence, which plays an important role in many problems in astrophysics, space physics and laboratory plasma physics. Numerical simulations of MHD turbulence are of great value, but the Reynolds numbers that are attainable are far below those relevant to nature. There is therefore much interest in building phenomenological models to understand the universal scaling properties of the smallscale fluctuations.
In this talk I shall describe how highresolution numerical simulations coupled with phenomenological modelling can be very useful for gaining insight into the basic properties of MHD turbulence (e.g. the process of scaledependent alignment of the velocity and the magnetic field fluctuations (Boldyrev, 2006)). I will also discuss how the Kolmogorov selfsimilarity hypotheses for the universal structure of the inertial and dissipation intervals of hydrodynamic turbulence do not pass over easily into the MHD case, and how this imposes stringent resolution requirements on numerical studies of MHD turbulence.
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