Seminar by Corentin Guillon

Vibratory response of a panel excited by a spatially varying turbulent boundary layer for marine application

The work presented was funded by the DGA (Ministère des Armées) in the frame of the development of new tools to design silent ship and submarine propellers. Among various acoustical phenomena, focus is brought on the vibro-acoustic response of structures (the blade) excited by a turbulent boundary layer, starting at the leading edge of the blade, and exhibiting strong spatial evolution of its parameters. The computation of the structure vibration response is done in the wavenumber-frequency space, where the excitation is modelled by a spectrum of wall turbulent pressure fluctuation. However, models in the literature of such spectra are given for homogeneous boundary layer. The proposed approach consists in specifying several areas along the structure and defining a homogeneous boundary layer restricted to each area, depending on boundary layer parameters on the given area. The vibro-acoustic response of the overall structure to these distinct boundary layers is then computed. In this approach it is assumed that the pressure fields acting on different areas are non-correlated, which become questionable when the number of areas increases. To conclude, an application will be introduced, exhibiting the benefit of the presented technique.

This seminar will be held online. Click here to join the Zoom event.