  In this paper three dimensional relativistic hydrodynamic simulations of AGN
jets are presented to investigate the FR I/FR II dichotomy. Three simulations
are presented which illustrates the difference in morphology for high/low
Lorentz factor injection as well as a stratified background medium. Lorentz
factors of 10 and 1.0014 were used for the high and low Lorentz factor cases
respectively. The hydrodynamic simulations show a division in the morphology of
jets based on their initial injection luminosity. An additional simulation was
set up to investigate the evolution of the low Lorentz factor jet if the mass
injection was lowered after a certain time. A synchrotron emission model was
applied to these simulations to reproduce intensity maps at radio frequencies
(1.5GHz) which were compared to the observed emission structures of FR I/FR II
radio galaxies. The effect of Doppler boosting on the intensity maps was also
investigated for different polar angles. The intensity maps of both the high
and low Lorentz factor cases reproduced emission structures that resemble those
of FR II type radio galaxies with a dominant cocoon region containing time
dependent hot spots and filaments. An FR I like structure was, however,
produced for the low Lorentz factor case if the mass injection rate was lowered
after a set time period.
