Investigation of turbulent boundary layers with pressure gradient at high Reynolds numbers with high resolution multi camera techniques

• Applicants: Professor Dr. Christian Joachim Kähler; Professor Dr. Andreas Schröder
• Subject Area: Fluid Mechanics
• Term: from 2012 to 2021
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 225618882

• Final Report Year: 2021

Final Report Abstract

The second funding period of the DFG project enabled a further development of the advanced Lagrangian Particle Tracking techniques STB and MP-STB and allowed a very successful application of STB and FlowFit for the investigation of large-scale flow structures in APG-TBL flows at high Reynolds numbers. An unprecedented wealth of data comprising time-resolved 3D Lagrangian and Eulerian velocity, acceleration and pressure information in a huge measurement volume down to flow separation was acquired and analyzed. Within the project, all work packages were successfully completed. The analysis of the data has led to a much better understanding of the turbulent superstructures under the action of pressure gradients. But also the interaction of the structures with separated flow regions has greatly enhanced the understanding of the spatial and temporal dynamics of the separation line.

Publications

• (2017) Scaling and dynamics of large-scale structures in turbulent boundary layers with pressure gradients. In Proceedings of 10th International Symposium on Turbulence and Shear Flow Phenomena (TSFP10), 06.-09. July, Chicago, USA
  Eich, F., Kähler C. J.
  
• (2017). Investigation of a turbulent boundary layer flow at high Reynolds number using particle-imaging and implications for RANS modeling. In TSFP DIGITAL LIBRARY ONLINE. Begel House Inc.
  Knopp, T., Novara, M., Schulein, E., Schanz, D., Schroder, A., Reuther, N., & Kahler, C. J.
  
• (2018) Investigation of large-scale structures in turbulent boundary layers under an adverse pressure gradient up to flow detachment. 1th European Fluid Mechanics Conference (EFMC11), 09.-13. September 2018, Vienna
  Eich, F., Kähler, C. J.
  
• (2018). Multi-exposed recordings for 3D Lagrangian particle tracking in turbulent boundary layer flows by means of multi-pulse shake-the-box. 19th International Lisbon Symposium (No. 176, pp. 1-16)
  Novara, M., Schanz, D., Geisler, R., Voß, C., & Schröder, A.
  
• (2018, July). Investigation of a high Reynolds number turbulent boundary layer flow with adverse pressure gradients using PIV and 2D-and 3D-Shake-The-Box. 19th International Lisbon Symposium (pp. 16-19)
  Schröder, A., Schanz, D., Novara, M., Philipp, F., Geisler, R., Agocs, J., ... & Willert, C. E.
  
• (2019) Large field of view volumetric measurements of a turbulent boundary layer. 72th Annual Meeting of the APS Division of Fluid Dynamics, 23.-26. November, Seattle, WA
  Eich, F., Bross, M., Schanz, D., Novara, M. Schröder, A., Kähler, C. J.
  
• (2019) Large-scale structures in turbulent boundary layers under an adverse pressure gradient up to flow separation. In Proceedings of 11th International Symposium on Turbulence and Shear Flow Phenomena (TSFP11), 30. July-02. August, Southampton, UK
  Eich, F., Kähler C. J.
  
• (2019). Largescale volumetric characterization of a turbulent boundary layer flow. 13th International Symposium on Particle Image Velocimetry – ISPIV 2019, Munich, Germany
  Schanz, D., Novara, M., Geisler, R., Agocs, J., Eich, F., Bross, M., Kähler, C. J., & Schröder, A.
  
• (2019). Multi-exposed recordings for 3d lagrangian particle tracking with multi-pulse shake-the-box. Experiments in Fluids, 60(3), 1-19
  Novara, M., Schanz, D., Geisler, R., Gesemann, S., Voss, C., & Schröder, A.
  (See online at https://doi.org/10.1007/s00348-019-2692-7)
• (2019). Spatiotemporal measurement of superstructures in a turbulent boundary layer flow. In 17th European Turbulence Conference ETC 2019 (No. 95, pp. 1-1). Deutsches Zentrum für Luft-und Raumfahrt eV.
  Schanz, D., Schröder, A., Novara, M., Geisler, R., Agocs, J., Eich, F., ... & Kähler, C. J.
  
• (2020). Large-scale coherent motions in turbulent boundary layers under an adverse pressure gradient up to flow separation. International Journal of Heat and Fluid Flow, 85, 108645
  Eich, F., & Kähler, C. J.
  (See online at https://doi.org/10.1016/j.ijheatfluidflow.2020.108645)
• (2020). Towards an improved spatial representation of a boundary layer from the attached eddy model. Physical Review Fluids, 5(3), 034601
  Eich, F., de Silva, C. M., Marusic, I., & Kähler, C. J.
  (See online at https://doi.org/10.1103/PhysRevFluids.5.034601)
• (2021) Shake- The-Box investigation of turbulent boundary layer flows with adverse pressure gradient. iTi 2021 Conference on Turbulence, February 25th-26th, 2021
  Novara, M., Schanz, D., Geisler, R., Agocs, J., Eich, F., Bross, M., Kähler, C.J. & Schröder, A.