Computer Science – Sound
Scientific paper
Jun 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..386..410m&link_type=abstract
Extragalactic Jets: Theory and Observation from Radio to Gamma Ray ASP Conference Series, Vol. 386, proceedings of the conferenc
Computer Science
Sound
Scientific paper
A new general relativistic magnetohydrodynamics (GRMHD) code ``RAISHIN'' used to simulate jet generation by non-rotating and rotating black holes with a geometrically thin Keplerian disk finds that the jet forms a spine-sheath structure in the rotating black hole case. Spine-Sheath structure and strong magnetic fields significantly modify the Kelvin-Helmholtz (KH) velocity shear driven instability. The RAISHN code has been used to study the effects of strong magnetic fields and weakly relativistic shear motion, c/2, on the KH instability associated with a relativistic jet (γ=2.5) spine-sheath interaction. In the simulations sound speeds up to ˜ c/√{3} and Alfvén wave speeds up to ˜ 0.56c are considered. Numerical simulation results are compared to theoretical predictions from a new normal mode analysis of the linearized RMHD equations. Increased stability of a weakly magnetized system resulting from c/2 sheath speeds and stabilization of a strongly magnetized system resulting from c/2 sheath speeds is found.
Hardee Philip E.
Mizuno Yosuke
Nishikawa Ken-Ichi
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