Greifswald 2024 – scientific programme

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EP: Fachverband Extraterrestrische Physik

EP 5: Astrophysics

EP 5.3: Talk

Wednesday, February 28, 2024, 14:45–15:00, ELP 1: HS 1.22

MHD simulations of turbulent galactic outflows — •Jens Kleimann and Horst Fichtner — Theoretische Physik IV, Ruhr-Universität Bochum, Germany

Simulations of the wind-filled halos of starburst galaxies are performed in the framework of magnetohydrodynamics (MHD), suitably extended to track additional turbulence-related quantities. These quantities comprise the turbulent energy density, the cross-helicity, and the turbulent lengthscale. After a brief discussion of these extended equations and the employed numerical approach, I will present first simulation results, both for non-magnetized benchmark runs as well as for tests using the full system of equations. The dominant and unexpected feature of the former is a macroscopic flow instability near the rotational axis that prevents the outflow from reaching a steady state. Methods to determine the cause and nature of this instability are presented. The talk concludes with an analysis of the resulting turbulent properties, comparing them to the solutions found from similar work targeting the outer heliosphere.

Keywords: galaxy; simulation; turbulence; magnetohydrodynamics; outflow