Hannover 2010 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 5: Theory/Modelling I
P 5.1: Fachvortrag
Dienstag, 9. März 2010, 14:15–14:40, B 302
Evoultion of MHD Turbulence — •Martina Wisniewski1, Felix Spanier1, and Ralf Kissmann2 — 1Lehrstuhl für Astronomie, University of Würzburg — 2Department of Physics, University of Helsinki
In this talk we present the results of our turbulence evolution simulations. The plasma starts out from an unperturbed state while a discrete turbulent energy is injected into the system at each time step. The energy of the system increases until reaching convergence. This enables us to study the physics taking place on small time scales where only a few waves are present (e.g. three wave interactions). On intermediate time scales it can be analysed how the full turbulent spectrum evolves and on large time scales the convergency range is analysed. We inject either pure compressible or pure incompressible energy and analyse how the results depend on this driving. We also vary the magnetisation of the system as a second parameter.
These simulations are done on the basis of our three dimensional MHD-code. The MHD-equations are evolved by an second order CWENO solver. The time evolution is simulated by a third order RK-algorithm.