  This paper describes a multidimensional hydrodynamic code which can be used
for the studies of relativistic astrophysical flows. The code solves the
special relativistic hydrodynamic equations as a hyperbolic system of
conservation laws based on High Resolution Shock Capturing (HRSC) Scheme. Two
standard tests, one of which is the relativistic blast wave tested in our
previous paper\cite{DO1}, and the other is the collision of two
ultrarelativistic blast waves tested in here, are presented to demonstrate that
the code captures correctly and gives solution in the discontinuities,
accurately.
  The relativistic astrophysical jet is modeled for the ultrarelativistic flow
case. The dynamics of jet flowing is then determined by the ambient parameters
such as densities, and velocities of the jets and the momentum impulse applied
to the computational surface. We obtain solutions for the jet structure,
propagation of jet during the time evolution, and variation in the Mach number
on the computational domain at a fixed time.
