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We examine simulations of isolated galaxies to analyse the effects oflocalised feedback on the formation and evolution of molecular clouds. Feedbackcontributes to turbulence and the destruction of clouds, leading to apopulation of clouds that is younger, less massive, and with more retrograderotation. We investigate the evolution of clouds as they interact with eachother and the diffuse ISM, and determine that the role of cloud interactionsdiffers strongly with the presence of feedback: in models without feedback,scattering events dramatically increase the retrograde fraction, but in modelswith feedback, mergers between clouds may slightly increase the progradefraction. We also produce an estimate of the viscous time-scale due tocloud-cloud collisions, which increases with increasing strength of feedback(~20 Gyr vs ~10 Gyr), but is still much smaller than previous estimates (~1000Gyr); although collisions become more frequent with feedback, less energy islost in each collision than in the models without feedback.

Cloud angular momentum and effective viscosity in global SPH simulations with feedback