Spatially and temporally resolved 2C-2D PIV in the inner layer of a high Reynolds number adverse pressure gradient turbulent boundary layer

Adverse pressure gradient (APG) turbulent boundary layer (APG-TBL) flow are pervasive throughout engineering and geophysical flows, yet the least is known of the physics of these wall-bounded flows. This paper reports on certain aspects of an international collaborative experiment that was undertaken under the auspices of EuHIT to quantify the statistical and detailed structure of an APG-TBL that develops on an inclined wall from a high Reynolds number upstream zero-pressure gradient (ZPG) turbulent boundary layer (ZPG-TBL) flow as depicted in Fig. 1. Specifically in this paper the spatially resolved wall shear stress distribution and the temporally resolved wall-normal distribution of the streamwise and wall-normal velocity at Position 1 shown in Fig. 1 will be reported and analysed in this paper

Experimental Measurements of a High Reynolds Number Adverse Pressure Gradient Turbulent Boundary Layer

The study of adverse pressure gradient turbulent boundary layers is complicated by the need to characterise both the local pressure gradient and it’s upstream flow history. It is therefore necessary to measure a significant streamwise domain at a resolution sufficient to resolve the small scales features. To achieve this collaborative particle image velocimetry (PIV) measurements were performed in the large boundary layer wind-tunnel at the Laboratoire de Mecanique de Lille, including: planar measurements spanning a streamwise domain of 3.5m using 16 cameras covering 15δ; spanwise wall-normal stereo-PIV measurements, high-speed micro-PIV of the near wall region and wall shear stress; and streamwise wall-normal PIV in the viscous sub layer. Details of the measurements and preliminary results will be presented