CAA broadband noise prediction for aeroacoustic design

By Roland Ewert, J. Dierke, Jona Siebert, A. Neifeld, C. Appel, M. Siefert, O. Kornow. 2011

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Abstract The current status of a computational aeroacoustics (CAA) approach to simulate broadband noise is reviewed. The method rests on the use of steady Reynolds averaged Navier–Stokes (RANS) simulation to describe the time-averaged motion of turbulent flow. By means of synthetic turbulence the steady one-point statistics (e.g. turbulence kinetic energy) and turbulent length- and time-scales of RANS are translated into fluctuations having statistics that very accurately reproduce the initial RANS target-setting. The synthetic fluctuations are used to prescribe sound sources which drive linear perturbation equations. The whole approach represents a methodology to solve statistical noise theory with state-of-the-art CAA tools in the time-domain. A brief overview of the synthetic turbulence model and its numerical discretization in terms of the random particle-mesh (RPM) and fast random particle-mesh (FRPM) method is given. Results are presented for trailing-edge noise, slat noise, and jet noise. Some problems related to the formulation of vortex sound sources are discussed.

Subfields: Aerospace Engineering, Biomedical Engineering, Environmental Engineering

View Paper: https://www.semanticscholar.org/paper/ea1a0dadfcb0165de5bc77f5e4163797b22095d9