I am currently working on a project with Enrico Ramirez-Ruiz and Doug Lin on the properties of cluster accretion. We are simulating cluster accretion with FLASH, an adaptive mesh refinement (AMR) parallel simulation code running on Pleiades.
This model is currently being used as an explaination of Ultra Luminous X-ray sources (ULXs) in the Antennae Galaxies and other merging galaxy systems. We will extend our simulations to dark matter halos and merging galaxies themselves.
The top image is of several snapshots of density enhancements for a few of the cluster models. Models are of varying core size and the background gas has a variety of Mach numbers.