Nested multi-resolution PIV measurements of wall bounded turbulence at high Reynolds numbers

Here we describe the use of a nested high magnification camera configuration within a large field of view (FOV) PIV experiment. The objective of these measurements is to obtain instantaneous velocity flow fields to resolve the wide range of scales present in turbulent boundary layers at high Reynolds numbers of up to Reτ ≈ 20000. Flow statistics are compared against previous measurements made using hot-wire anemometry to validate and assess the quality of the PIV velocity fields. Preliminary analysis shows that the instantaneous wall shear stress can be computed from the experimental data, enabling us to directly compute quantities such as the friction velocity.