Turbulent flow past a low-aspect-ratio finite wall-mounted cylinder at various degrees of upstream sheltering.

Planar particle image velocimetry was used to investigate various degrees of upstream flow sheltering past a finite wall-mounted cylinder immersed in a turbulent boundary layer. The extent of upstream sheltering was investigated using one to four upstream sheltering cylinders positioned in tandem at various streamwise spacings (2d and 6d, where d is the cylinder diameter) and height ratios (hu /hd = 0.5 and 1, where h¬¬u is the height of the upstream cylinders and hd denotes the height of the downstream cylinder). The preliminary results indicate that, in the wake of the downstream cylinder, the spatial distribution and magnitude of the time-averaged velocity and turbulence quantities becomes independent of upstream sheltering after two upstream cylinders are introduced.