Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2010-12-21
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
9 pages, 3 figures, proceedings IAU270 "Computational Star Formation" eds. Alves, Elmegreen, Girart, Trimble
Scientific paper
Firstly, we give a historical overview of attempts to incorporate magnetic fields into the Smoothed Particle Hydrodynamics method by solving the equations of Magnetohydrodynamics (MHD), leading an honest assessment of the current state-of-the-art in terms of the limitations to performing realistic calculations of the star formation process. Secondly, we discuss the results of a recent comparison we have performed on simulations of driven, supersonic turbulence with SPH and Eulerian techniques. Finally we present some new results on the relationship between the density variance and the Mach number in supersonic turbulent flows, finding sigma^2_{ln rho} = ln (1 + b^2 M^2) with b=0.33 up to Mach~20, consistent with other numerical results at lower Mach number (Lemaster and Stone 2008) but inconsistent with observational constraints on sigma_rho and M in Taurus and IC5146.
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