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ABSTRACT
Over the last years, the observation of large-scale structures in turbulent boundary layer flows has stimulated intense experimental and numerical investigations. Nevertheless, partly due to the lack of comprehensive experimental data at sufficiently high Reynolds number, our understanding of turbulence near walls, especially in decelerating situations, is still quite limited. The aim of the present contribution is to combine the equipment and skills of several teams to perform a detailed characterisation of a large-scale turbulent boundary layer under adverse pressure gradient. Extensive particle image velocimetry (PIV) measurements are performed, including a set-up with 16 sCMOS cameras allowing the characterisation of the boundary layer on 3.5 m, stereo PIV and high resolution near wall measurements. In this paper, detailed statistics are presented and discussed, boundary conditions are carefully characterised, making this experiment a challenging test case for numerical simulation.
Acknowledgments
The authors are thankful to the EuHIT EC project (http://www.EUHIT.org) for the financial support which has allowed this experiment to take place. The LML members of the team are thankful to CISIT, the Region Nord-Pas-de-Calais, the European community and the CNRS for the financial support and notably the one which has allowed making the test section fully transparent, permitting this experiment. The Monash team gratefully acknowledges the support of an Australian Research Council support via a Discovery project grant in this research. Julio Soria also gratefully acknowledges the support of an Australian Research Council Discovery Outstanding Researcher Award fellowship.
Disclosure statement
No potential conflict of interest was reported by the authors.