CFD-ACE+ 2007.2. multiphysics software employs multiple reference frames to solve turbo characteristics in a steady state manner without the need to physically rotate the parts. This provides quick and accurate results to evaluate different design alternatives before the physical prototype is built. Volume of free surfaces for unstructured meshes eliminates the requirement of structured mesh for complex geometries. Since, in many cases, an unstructured mesh contains many fewer cells than the corresponding hexahedral grid, time to solution can be faster. The fast time stepping scheme feature allows faster solutions for complex and expensive transient problems. This scheme precludes multiple global iterations within each time-step. Instead, a number of sub-iterations are performed on individual equations followed by a single global iteration to obtain a solution.