CFD-based prediction of wall-pressure spectra under a turbulent boundary layer with adverse pressure gradient

Gabriele Grasso (1) , Hao Wu (2) , Susanna Orestano (2) , Marlène Sanjosé (2) , Stéphane Moreau (2) , Michel Roger (1)

1 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique
2 UdeS - Département de génie mécanique [Sherbrooke]

A model of the spectrum of wall-pressure fluctuations under a turbulent boundary layer based on an analytical solution of the Poisson equation is presented. This model is suited for aeroacoustic prediction based on CFDextracted flow information, but requires statistical properties of the boundarylayer turbulence that are not resolved in steady-state simulations and need to be modelled. For this reason, this paper uses Lattice-Boltzmann (DNS-LBM) and Navier-Stokes Direct Numerical Simulations (DNS-NS) of an airfoil in a wind-tunnel jet to investigate the link between turbulence and wall-pressure statistics and validate the assumptions made in the application of the analytical model. The use of input from two numerical simulation methods allows generalizing the results of the analytical model.

Mots clés: Aeroacoustics; turbulent boundary layer; computational fluid dynamics; trailing-edge noise

Domaines: Mécanique des fluides [physics.class-ph]; Acoustique [physics.class-ph]

Gabriele Grasso, Hao Wu, Susanna Orestano, Marlène Sanjosé, Stéphane Moreau, et al.. CFD-based prediction of wall-pressure spectra under a turbulent boundary layer with adverse pressure gradient. CEAS Aeronautical Journal, 2021, 12 (1), pp.125-133. ⟨10.1007/s13272-020-00484-5⟩. ⟨hal-03224147⟩