Numerical Simulations of Axially Symmetric Magnetized Jets - Part Three - Collimation of Underexpanded Jets by Magnetic Fields

Details Numerical Simulations of Axially Symmetric Magnetized Jets - Part Three - Collimation of Underexpanded Jets by Magnetic Fields Numerical Simulations of Axially Symmetric Magnetized Jets - Part Three - Collimation of Underexpanded Jets by Magnetic Fields

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229..401k&link_type=abstract

Astronomy and Astrophysics, Vol. 229, NO. 2/MAR(II), P. 401, 1990

Astronomy and Astrophysics

Astrophysics

12

Scientific paper

Using a finite difference scheme based on the FCT-algorithm, we have performed a set of hydrodynamic and magnetohydrodynamic simulations to investigate the stability of both magnetized and unmagnetized underexpanded (ζ_H_ = 10) jets. We find that unmagnetized jets with a fairly high Mach number (Ma_B_ = 6) are stable; low Mach number jets (Ma_B_ <~ 2), on the other hand, exhibit prominent instabilities. A toroidal magnetic fie1d of approximately equipartition field strength is capable of stabilizing these instabilities due to the pinch effect. However, it changes the morphology of the jet completely by generating a nose cone. The influence of an additional poloidal magnetic field, with a field strength comparable to the fie1d strength of the toroidal component, is small. Its main effect is that it forces part of the nose cone into a sonic rotation.

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