Numerical aeroacoustics

The numerical testing of aeroacoustic phenomena is carried out at FKFS by means of modern CFD methods, both, based on the Navier-Stokes equations (e.g. OpenFOAM) as well as based on the Lattice-Boltzmann method (e.g. PowerFLOW®) (see also Digital wind tunnel). 

Transient simulation of sunroof buffeting of an SAE body (total pressure).
Transient simulation of sunroof buffeting of an SAE body (total pressure).
Simulation of a sound pulse propagation in the turbulent flow around a vehicle for estimating propagation effects.
Simulation of a sound pulse propagation in the turbulent flow around a vehicle for estimating propagation effects.

Depending on the requirements and the subject being investigated, these flow simulations are 

  • realized as a direct simulation,
  • coupled with acoustic post-processing or
  • coupled with a structural code (FEM, BEM, SEA). 

The typical objects and subjects of interest for aeroacoustic investigations are:

  • the add-on parts (antenna, side view mirror, windscreen wipers, etc.) 
  • the A-pillar vortex
  • the underbody
  • the sunroof and side window buffeting noise 

Fluid-structure coupling and fluid-structure interaction has become an important field of investigations. FKFS is developing methods in order to improve the simulation of fluid-structure coupling and interaction. 

 

If necessary, the simulations are accompanied by verification experiments in the on-site wind tunnels or other vehicle test benches.

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