Flow decomposition
The decomposition of velocity or pressure fields, on an adapted temporal sampling, makes it possible to visualize the flow modes as a function of frequency. This technique provides new possibilities for optimisation, to reduce the level of radiated noise, through changes in shape, in the areas where the acoustic sources of aerodynamic origin are located.
Example of flow decomposition from instantaneous velocity fields obtained with a Lattice Boltzmann solver, showing two different wavelengths, one aerodynamic and the other acoustic at the frequency of 350 Hz.
The reduction of vortices, which are the source of correlated acoustic sources, in each wheel casing, can contribute, by optimizing form, to reducing the noise of passing by motor vehicles.
