Abstract
We present a turbulent boundary layer flow experiment at a high Reynolds number and at a significant adverse pressure gradient leading to separation, which was performed within the DLR project VicToria. We describe the design of the test case, the set-up in the wind-tunnel, and the measurement technique using particle imaging and particle tracking with the novel Shake-The-Box technique. We present the experimental results for the mean velocity profiles and a wall-law for adverse pressure gradients. Then we consider RANS turbulence modelling and propose a modification of the equation for the dissipation rate \(\omega \) in the SSG/LRR-\(\omega \) model, so that the modified model can predict the proposed wall-law at adverse pressure gradients. Finally we show numerical results using the modified SSG/LRR-\(\omega \) model. The modifications cause a reduction of the near-wall flow velocity at adverse pressure gradients making the modified model more susceptible for flow separation. Both observations are in good agreement with the experimental data.
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Acknowledgements
The authors are grateful to Prof. Manhart for providing his DNS data. The cooperation with N. Reuther, F. Eich, C. Kähler, M. Zippert, M. Tegeler, A. Krumbein, C. Grabe and S. Görtz is gratefully acknowledged.
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Knopp, T. et al. (2020). Modification of the SSG/LRR-\(\omega \) RSM for Turbulent Boundary Layers at Adverse Pressure Gradient with Separation Using the New DLR VicToria Experiment. In: Dillmann, A., Heller, G., Krämer, E., Wagner, C., Tropea, C., Jakirlić, S. (eds) New Results in Numerical and Experimental Fluid Mechanics XII. DGLR 2018. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 142. Springer, Cham. https://doi.org/10.1007/978-3-030-25253-3_8
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DOI: https://doi.org/10.1007/978-3-030-25253-3_8
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