DOCTORAL CANDIDATE
Ajit Rokade

SUPERVISORS
Christophe Bailly
Roberto Sabatini
Rey Chin

Aerodynamics, CFD, Transition and Turbulence, Aeroacoustics, eVTOL and Urban Mobility, Bio-inspired flights, Machine-Learning, Data-driven reduced-order models

The study of wall pressure fluctuations beneath a turbulent boundary layer has drawn the attention of researchers for decades due to their importance in a wide range of applications dealing with vibro-acoustics or aero-acoustics. Applications can be found in the automotive and aeronautical industries, as well as in hydroacoustic studies focused on marine technology, to cite only a few. Intensive research has been carried into the field over the past seventy years or so, at first mostly in the absence of pressure gradient. Contrary to what can be obtained for the turbulent velocity spectra, we observe a significant disparity in the measurements. These measurements are indeed difficult to perform, with sensors that do not allow to resolve the spectra to viscous scales. Moreover, pressure is a non-local quantity that probably integrates various installation effects. There are still open questions and ongoing research linked to the experimental or numerical characterisation of wavenumber – frequency spectra, and the ability to account for pressure gradient effects. A special emphasis will be placed on controlling the pressure gradient applied to turbulent boundary layers in equilibrium in pipes or channel flows to obtain reliable numerical data. We then propose to make progress in the modelling of the convective spot in the wavenumber – frequency space, and to obtain wall pressure spectra as a result of their integration in Fourier space.