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EP: Fachverband Extraterrestrische Physik

EP 7: Poster Session Extraterrestrics

EP 7.22: Poster

Tuesday, March 31, 2009, 17:30–19:00, Foyer der Zahnklinik

A low-dissipation central scheme for compressible MHD turbulence — •Christian Vogel and Wolf-Christian Müller — Max-Planck-Institute for Plasma Physics, Garching bei München

The efforts to study supersonic turbulence focus on turbulent dynamics which is probably of importance for star- and structure-formation in the interstellar medium. To this end, a new numerical framework is being developed to work reliably on turbulent configurations with Mach numbers greater than five. Special attention is paid to a low dissipation approach since thin and sharply resolved shock fronts are a dominant feature of supersonic turbulence. The new 2D and 3D compressible MHD codes are able to capture shocks while maintaining the divergence free constraint on the magnetic field. The underlying Kurganov-Tadmor type numerical scheme in combination with third order CWENO reconstruction is built on central differences meeting the requirements of low numerical dissipation and of high precision. The 3D MHD code has been parallelized in two space dimensions and allows for simulations with resolutions up to 10243. The experimental order of convergence was measured as O(x3). With the current set-up decaying supersonic compressible turbulence simulations at a resolution of 5123 have been carried out. The kinetic energy spectrum shows an inertial range spread over a decade in spectral space, showing a Kolmogorov-like scaling exponent and no bottleneck effect as is present in PPM simulations.