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It is suggested in observations of supernova remnants that a number of large-and small-scale structures form at various points in the explosion.Multidimensional modeling of core-collapse supernovae has been undertaken sinceSN1987A, and both simulations and observations suggest/show thatRayleigh-Taylor instabilities during the explosion is a main driver for theformation of structure in the remnants.  We present a case study of structure formation in 3D in a \msol{15} supernovafor different parameters. We investigate the effect of moderate asymmetries anddifferent resolutions of the formation and morphology of the RT unstableregion, and take first steps at determining typical physical quantities (size,composition) of arising clumps. We find that in this progenitor the major RTunstable region develops at the He/OC interface for all cases considered. TheRT instabilities result in clumps that are overdense by 1-2 orders of magnitudewith respect to the ambient gas, have size scales on the level of a few % ofthe remnant diameter, and are not diffused after the first $\sim30$ yrs of theremnant evolution, in the absence of a surrounding medium.

A Case Study of Small Scale Structure Formation in 3D Supernova Simulations