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The main challenge for understanding the fuelling of supermassive black holesin active galactic nuclei is not to account for the source of fuel, but ratherto explain its delivery from the boundaries of the black hole sphere ofinfluence (10-100 pc) down to sub-parsec scales. In this work, we report on aseries of numerical experiments aimed at exploring in further depth our modelof "overlapping inflow events" as catalysts for rapid accretion, seeding aturbulent field in the infalling gas. We initially set a gaseous shell innon-equilibrium rotation around a supermassive black hole. After infall, theshell stalls in a disc-like structure. A second shell is then set in eitherco-rotation or counter-rotation with respect to the first and is let to impingeon the previously-formed disc. We find that combined turbulence and overlapsignificantly enhance accretion in counter-rotating inflows, while turbulencedominates for co-rotating inflows. The leftovers of overlapping inflows arewarped nuclear discs, whose morphology depends on the relative orientation andangular momentum of the disc and the shell. Overlapping inflows leaveobservational signatures in the gas rotation curves.

Overlapping inflows as catalysts of AGN activity - II: Relative importance of turbulence and inflow-disc interaction