One thing most engineers have in common is a fascination for elliptic gears. And with the impending release of STAR-CCM+ v8.04, it will be easier than ever to set the wheels in motion. Indeed, one of the most exciting features of STAR-CCM+ v8.04 is an enhanced overset mesh technology which allows for multiple overlapping overset zones. Overset meshes, also known as “Chimera” or overlapping grids, may be used to simulate the relative motion of one or more bodies, including arbitrary or tangential motions of objects in close proximity. And whereas it has been possible to overlap overset grids with a background mesh since the release of STAR-CCM+ v7.02, it will now also be possible to overlap overset grids with each other.