MECHANISM OF WALL PRESSURE FLUCTUATIONS BENEATH THE OPEN CHANNEL FLOW

Based on the measured results that wall pressure fluctuations are mainly de-cided by coherent structures of turbulence, the relationship between root-mean-square wall pressure and wall shear stress in turbulent shear flow and that betweenthe intensities of pressure and fluctuating velocity in homogeneous and isotropicturbulence are established in this paper. These relationships are consistent withformer works, and have good agreement with experimental data. The paper also dis-cusses the concept of "apparent pressure" on the wall in mean flow.