Simulation of open- and ducted-rotor noise using CAA-Multidomain method

Kurzfassung

The sound field generated by an open rotor and that radiated by the same rotor placed inside a semi-infinite duct is simulated using a Computational Aeroacoustic (CAA) multi-domain method. The linearized Euler equations in cylindrical coordinates are used as governing equations in solving this problem. Both Tam's radiation and PML boundary conditions are used. Comparisons of results by using the two different far-field boundary conditions will be given. A multi-domain Cartesian grid system is used so that the number of grid points can be kept as a minimum. A combination of DRP and a specially optimized cell-centered high order differencing scheme is implemented in the area of two Cartesian grid interfaces. The effect of mean flow including a shear layer on the noise radiation off the ducted rotor is studied.