Normal- and Shear-Stress Over a Flat-Surface Established an Inclined Cylinder on

The structure of a wake downstream of a bluff body is one of the important problems in practical application, and the cylinder is commonly used as the base case. There is little information about the structure of the wake of an inclined cylinder interacting with the turbulent boundary layer. In this case, Karman vortex, horseshoe vortex and wake can be interacted. This paper is an experimental study focused on the complex three-dimensional structure in turbulent boundary layer interacting with the inclined cylinder. Correlation between time averaged normal-stress and shear-stress over the flat surface established an inclined cylinder is discussed. The static pressure is measured for the time averaged normalstress and oil film flow visualization is conducted to investigate the direction of shear-stress. Inclined streamwise and spanwise cylinders at several inclined angles are installed on the flat surface where 2-D turbulent boundary layer is developed. Weak correlation between normal-stress and shear-stress is observed at upstream of the inclined cylinder. On the other hand, strong correlation is reported at downstream of the cylinder.