A high-order Godunov scheme for global 3D MHD accretion disks simulations. I. The linear growth regime of the magneto-rotational instability - Astrophysics > Earth and Planetary AstrophysicsReportar como inadecuado




A high-order Godunov scheme for global 3D MHD accretion disks simulations. I. The linear growth regime of the magneto-rotational instability - Astrophysics > Earth and Planetary Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We employ the PLUTO code for computational astrophysics to assess and comparethe validity of different numerical algorithms on simulations of themagneto-rotational instability in 3D accretion disks. In particular we stresson the importance of using a consistent upwind reconstruction of theelectro-motive force EMF when using the constrained transport CT method toavoid the onset of numerical instabilities. We show that the electro-motiveforce EMF reconstruction in the classical constrained transport CT methodfor Godunov schemes drives a numerical instability. The well-studied lineargrowth of magneto-rotational instability MRI is used as a benchmark for aninter-code comparison of PLUTO and ZeusMP. We reproduce the analytical resultsfor linear MRI growth in 3D global MHD simulations and present a robust andaccurate Godunov code which can be used for 3D accretion disk simulations incurvilinear coordinate systems.



Autor: M. Flock, N. Dzyurkevich, H. Klahr, A. Mignone

Fuente: https://arxiv.org/







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