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We introduce a new suite of simulations, "The Cloud Factory", whichself-consistently forms molecular cloud complexes at high enough resolution toresolve internal substructure (up to 0.25 Msol in mass) all while includinggalactic-scale forces. We use a version of the Arepo code modified to include adetailed treatment of the physics of the cold molecular ISM, and an analyticalgalactic gravitational potential for computational efficiency. The simulationshave nested levels of resolution, with the lowest layer tied to tracerparticles injected into individual cloud complexes. These tracer refinementregions are embedded in the larger simulation so continue to experience forcesfrom outside the cloud. This allows the simulations to act as a laboratory fortesting the effect of galactic environment on star formation. Here we introduceour method and investigate the effect of galactic environment on filamentaryclouds. We find that cloud complexes formed after a clustered burst offeedback, have shorter lengths and are less likely to fragment compared toquiescent clouds (e.g. the Musca filament) or those dominated by the galacticpotential (e.g. Nessie). Spiral arms and differential rotation preferentiallyalign filaments, but strong feedback randomises them. Long filaments formedwithin the cloud complexes are necessarily coherent with low internal velocitygradients, which has implications for the formation of filamentarystar-clusters. Cloud complexes formed in regions dominated by supernovafeedback have fewer star-forming cores, and these are more widely distributed.These differences show galactic-scale forces can have a significant impact onstar formation within molecular clouds.

The Cloud Factory I: Generating resolved filamentary molecular clouds from galactic-scale forces