Numerical aeroacoustics

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

Transient simulation of the sunroof drumming noise (total pressure, calculated using PowerFLOW®).
Transient simulation of the sunroof buffeting noise (total pressure, calculated using PowerFLOW®).
Simulation of the propagation of a sound pulse in the turbulent air flow around the vehicle for estimating the propagation effects
Simulation of the propagation of a sound pulse in the turbulent air flow around the vehicle for estimating the propagation effects.

Depending on the object being tested, these flow simulations are 

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

The objects being tested on the vehicle in this context include: 

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

Fluid/structure coupling or fluid/structure interaction has since become an important area of focus. Here, FKFS is developing methods to facilitate this. 

 

If necessary, the simulations are be accompanied by verification experiments in the wind tunnels and on the vehicle test benches available at the institute.

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