Who should attend:

Engineers that already use Actran, preferably in aeroacoustic, and want to improve their knowledge in fan noise simulations.

 

Overview:

The aim of this session is to address advanced modeling capabilities available in Actran for predicting fan noises. You will be able to learn how to take into account the steady flow for Doppler effect as well as to model structural and porous components (aero-vibro-acoustic). Advanced methods to consider CFD information into the rotating domain will also be covered.

The usage of results provided by specific CFD (NLH, MRF) will also be covered as this allows reducing the CFD computation for specific cases.

 

Topics covered:

  • Summary of the basics about acoustic simulations
  • Convected and non-convected acoustic propagation in Actran
  • Draw attention on:
    • Non reflecting boundary conditions: infinite elements, PML, duct modes
    • Aeroacoustic sources computations: Lightill / Möhring surface source in the static or the rotating CFD part
    • Signal processing
  • Introduction to aero-vibroacoustic: adding structural elements and porous materials, example of the side mirror noise
  • Quicker methods (and their limitations) for addressing the fan noise: NLH, MRF, SNGR…
  • Post processing capabilities: acoustic directivities, radiated and dissipated powers, transmission loss, source terms, curves and maps