DOI: 10.1615/TSFP8
SPATIO-TEMPORAL 3D CORRELATIONS OF FLUCTUATING PRESSURE AND VELOCITY IN A HIGH REYNOLDS NUMBER TURBULENT BOUNDARY LAYER
RÉSUMÉ
In the present study, we developed a new experimental setup for the simultaneous measurements of the fluctuating pressure and the three velocity components in a turbulent boundary layer. A quantitative measure of the extension of the space-time pressure-velocity correlations is given based on their reconstructed 3D distributions. The correlations of the fluctuating pressure and each three velocity components exhibit characteristic behavior: the pressure-streamwise velocity correlations show the inclined elongated shape and have extensions approximately 5-6δ, while the pressure-wall normal velocity correlations are more localized with an extension of 0.3δ and with an inclination of roughly 45° at the pressure reference points close to the wall. The pressure-spanwise velocity correlations show the distribution evoking a representation of the streamwise vortical structures with the size of the order of the boundary layer thickness and the meandering of them.