Computer Science
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........62m&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF PENNSYLVANIA, 1987.Source: Dissertation Abstracts International, Volume: 48-03, Section: B, page:
Computer Science
5
Scientific paper
A numerical model is used to follow the two-dimensional shell of a three-dimensional radio jet. This model, in the spirit of previous work of Wiita and Siah, invokes a new computer code to relax two of their assumptions: (1) Internal pressure of the jet fluid is taken as a tensor, allowing for bulk motion of the internal relativistic gas. (2) Azimuthal symmetry is no longer assumed. Three-dimensional effects of two kinds have been modeled: bending in a "wind" resulting from motion of the host galaxy through an intergalactic medium; and stability of the jet cross-section against flattening or lobing. Results of the two-dimensional cases confirm and strengthen earlier inferences that hydrodynamics alone is incapable of accounting for observed jet collimation. Results on jet bending suggest, once again, that non-hydrodynamic effects must be invoked to explain some observations. With respect to jet cross-section, intricate oscillatory motions have been observed, some of which appear to be unstable and potentially disruptive.
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