  Active Galactic Nuclei (AGN) require mass accretion onto the central engine.
On large galactic scales, torques from a stellar bar can efficiently remove
angular momentum from gas, and cause it to move inwards along two
hydrodynamical shocks on the leading edges of the bar. Inflowing gas settles on
near-circular orbits around the Inner Lindblad Resonance (ILR), and forms a
nuclear ring, about 1 kpc in size. A secondary bar inside the main one, with
its own pair of shocks, has been proposed to drive further inflow, and thus
feed the AGN in a manner similar to the inflow on large scales. Here, we report
results of high resolution hydrodynamical simulations, where we examine the
nature of the nuclear ring, and check how efficient double bars can be in
fueling AGNs.
