  We address the role of large scale magnetic stress in the angular momentum
transport, as well as the formation of different kinds of magnetic barrier in
geometrically thick, optically thin, vertically averaged 1.5-dimensional
advective accretion flows around black holes. The externally generated magnetic
fields are captured by the accretion process from the environment, say,
companion stars or interstellar medium. This field becomes dynamically dominant
near the event horizon of a black hole due to continuous advection of the
magnetic flux. In such magnetically dominated accretion flows, the accreting
matter either decelerates or faces magnetic barrier in vicinity of the black
hole depending on the magnetic field geometry. We find that the accumulated
strong poloidal fields along with certain toroidal field geometry help in the
formation of magnetic barrier which may knock the matter to infinity. When
matter is trying to go back to infinity after getting knocked out by the
barrier, in some cases it is prevented being escaped due to cumulative action
of strong magnetic tension and gravity, and hence another magnetic barrier. We
suggest, this kind of flow may be responsible for the formation of episodic
jets in which magnetic field can lock the matter in between these two barriers.
We also find that for the toroidally dominated disc, the accreting matter
rotates very fast and decelerates towards the central black hole.
