Abstract
Broadband noise generated by a fan (DLR Berlin Fan Rig) is studied numerically using a novel variant of the DES the Improved Delayed Detached Eddy Simulation (IDDES). The full rotating geometry is simpli ed to an rotor-stator-cascade to analyse in detail the rotor and stator selfnoise and the stator interaction noise. The reference DLR Fan Rig has a rotor blade count of 24 with 30 stator vanes. The rotational tip Mach number is M = 0:220 at nominal loading. The IDDES approach is designed to extend the LES region of the original DES approach (hybrid RANS/LES) from Spalart et. al. (1997) to the turbulent boundary layer, as proposed rst by Travin et. al. in 2006. The non-zonal blending occures therefore inside the boundary layer the RANS model acts as a wall model for the LES. The actual work shows the capabilities of this novel approach for the simulation of broadband noise in turbo machines.
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