Abstract
Turbulent flows over rough walls have considerable engineering interest. In spatial inhomogeneous flow such as wall roughness flowcan be rendered globally homogeneous by using time- and space-averaging (double-averaging) method. There are a lot of experimental and numerical studies on wall roughness flow. However, spatial developing characteristics of rough wall has received less attention. Therefore, in the present study, turbulence measurements are conducted in open-channel flows with two-dimensional regular transverse square bar roughness by PIV. Spatial variability of flow field and dispersive effects in rough wall floware examined in detail.
