Abstract
We present an experimental investigation and data analysis of a turbulent boundary layer flow at a significant adverse pressure gradient for two Reynolds numbers \(Re_\theta =6200\) and \(Re_\theta =8000\). We perform detailed multi-resolution measurements by combining large-scale and long-range microscopic particle imaging. We investigate scaling laws for the mean velocity and for the total shear stress in the inner layer. In the inner part of the inner layer the mean velocity can be fitted by a log-law. In the outer part a modified log-law provides a good fit, which depends on the pressure gradient parameter and on a parameter for the mean inertial effects. Emphasis is on the Reynolds number effects on the mean velocity and shear stress.
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Acknowledgments
The authors are grateful to Prof. Skare for providing his data. The authors are also grateful to Profs. Rossow, Radespiel, Nagib and Herwig and to Drs. B. Eisfeld, A. Krumbein and D. Schwamborn for valuable discussions and suggestions.
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Knopp, T. et al. (2016). Experimental Investigation of a Turbulent Boundary Layer Subject to an Adverse Pressure Gradient at \(Re_{\theta }\) up to 10000 Using Large-Scale and Long-Range Microscopic Particle Imaging. In: Stanislas, M., Jimenez, J., Marusic, I. (eds) Progress in Wall Turbulence 2. ERCOFTAC Series, vol 23. Springer, Cham. https://doi.org/10.1007/978-3-319-20388-1_24
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DOI: https://doi.org/10.1007/978-3-319-20388-1_24
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