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DY: Fachverband Dynamik und Statistische Physik
DY 32: Poster: Active Matter, Soft Matter, Fluids
DY 32.28: Poster
Wednesday, March 20, 2024, 15:00–18:00, Poster C
Numerical simulations of subsonic magnetized plasma-jets — •Thomas Christian Vandamme1, David Kube1, Jean-Mathieu Teissier1, and Wolf-Christian Müller1,2 — 1Technische Universität Berlin, ER 3-2, Hardenbergstr. 36a, 10623 Berlin, Germany — 2Max-Planck/Princeton Center for Plasma Physics
In astrophysical processes such as star formation and accretion of material around compact objects free starting jets that travel huge distances, more than 105 or 107 times their initial radius, can be generated. This is in contrast to hydrodynamic jets, observed e.g. on earth, that suffer from Kelvin-Helmholtz-instabilities leading to disruption of their shear-layer and to turbulent mixing with the environment. Thus, astrophysical jets are subject to stability enhancing processes. Most of all the presence of a magnetic field has a significant impact on the jet’s stability.
In order to study the stabilizing effects of magnetic fields, we perform fourth-order accurate numerical simulations of isothermal subsonic jets, both in the hydrodynamic and magnetohydrodynamic case, for different magnetic field configurations in the interior of the jet.
Setups with a helical field topology dominated by axial field components show the most stabilizing effects. Simulations with purely axial or purely azimuthal fields tend to destabilize the jet through current driven instabilities or can not suppress the Kelvin-Helmholtz-modes effectively.
Keywords: jets; instability; stability; simulation; plasma