Unsteady simulation of rotor-rotor interaction using the method of time-inclined

There are larger unsteady pressure fluctuations in counter-rotating compressor because of no stator stage. This article describes use the method of time-inclined to deal with arbitrary pitch ratio for unsteady simulations. Navier-Stokes equation is converted to the time-inclined domain, so simple spatial periodicity condition is able to used without changing number of blades. The results using time-inclined method are also compared with the computation using reduction of blades number. It shows the method of time-inclined reflect the real unsteadiness of counter-rotating compressor.