  We conduct two-dimensional axisymmetric (referred to as 2.5D) hydrodynamical
numerical simulations of bubble evolution in clusters of galaxies. We inflate
bubbles using slow, massive jets with a wide opening angle, and follow their
evolution as they rise through the intra-cluster medium (ICM). We find that
these jet-inflated bubbles are quite stable, and can reach large distances in
the cluster while still maintaining their basic structure. The stability of the
jet-inflated bubble comes mainly from the dense shell that forms around it
during it's inflation stage, and from the outward momentum of the bubble and
the shell. On the contrary, bubbles that are inserted by hand onto the grid and
not inflated by a jet, i.e., an artificial bubble, lack these stabilizing
factors, therefore, they are rapidly destroyed. The stability of the
jet-inflated bubble removes the demand for stabilizing magnetic fields in the
bubble.
