Jena 2013 – wissenschaftliches Programm

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SYNU: Symposium Numerik

SYNU 1: Numerik

SYNU 1.4: Hauptvortrag

Donnerstag, 28. Februar 2013, 18:00–18:30, HS 2

Astrophysical simulations of gas dynamics with ionising radiation transport — •Jonathan Mackey — Argelander-Institut für Astronomie, Universität Bonn, Bonn, Deutschland

I will introduce the code "PION" developed for astrophysical magnetohydrodynamics with radiative transfer of ionising photons. Both implicit and explicit time-integration algorithms have been implemented in PION, and their relative strengths and weaknesses will be demonstrated. The accuracy and convergence rates of the different algorithms are quantified. The explicit algorithm is more efficient than the implicit algorithm and its parallel scaling is significantly better, running with >50 per cent efficiency on hundreds of cores. I will show results obtained with PION from 3D simulations of the dynamics of photoionised regions around massive stars moving supersonically through their surroundings. The results are compared to the surroundings of the nearby runaway massive star Zeta Ophiuchi.