On the onset of separation in turbulent boundary layer flow over two-dimensional humps of various size

摘要: The available laboratory data of turbulent boundary layer flow over two-dimensional obstacles have been examined in order to identify the parameters (such as aspect ratio or surface roughness) driving onset separation. A comparison with some linearized models suitable for atmospheric applications is also made. It results that i) model response can be highly sensitive detailed shape obstacle; ii) between obstacle length and thickness relevant determining pressure perturbation near surface; iii) shear stress poorly described most cases particular wake.