Example of Repeatability Issue in a Wind Tunnel Experiment Measured by PIV

Abstract

A fluid dynamic experiment in a wind tunnel has been repeated in few months. There were used the same equipment (PIV cameras, wind tunnel, model obstacle). The only difference is the time and the assembly. Thus the objective differences are calibration (tried to be as similar as possible) and atmospheric conditions represented by viscosity affecting Reynolds number. In this contribution we show the comparison of these experiments and we discuss the sources of errors decreasing the repeatability. The results are qualitatively same, reproducing even a small symmetry breaking, but they are not exactly the same in a quantitative manner.