Turbomachinery CFD simulations have become a standard in industry, although still presenting quite expensive and time consuming process. In order to alleviate this, a number of tools and methods have been developed, being an approximation or simplification of the ongoing process within turbomachinery. Some of these methods include the steady state Multiple Reference Frame approach (MRF), taking into account the rotation even though a steady state simulation is run. Another more recent method is the Harmonic Balance method, a quasi-steady state method due to a number of time instants being solved via coupled steady state equations. Finally, the approach with least approximations is the transient simulation where a large number of su...