Prediction of Flat Plate Self-Noise

Abstract

In this study, the accuracy of the computational methodology developed for prediction of turbulent flow noise at low Mach numbers is assessed for the flat plate self-noise. The far-field self-noise and the wall-pressure field over the flat plate (chord=10cm, thickness=3mm, and span=30cm) are measured at Ecole Centrale de Lyon for a flow speed UO=20m/s at zero angle of attack. The three-dimensional turbulent flow over the plate is computed by incompressible large eddy simulation (LES), while the near- and far-field acoustics are calculated by the linearized perturbed compressible equations (LPCE), coupled with the LES solutions. Comparisons are made for the wall pressure PSD spectra near the trailing-edge, the spanwise coherence function of the surface pressure, and the farfield sound pressure level spectrum. The computations agree well with the experiment. The tonal and broadband noise characteristics of the flat plate are also discussed.