Abstract
The near-wall structures of a cylindrical roughness element were investigated experimentally. The element of aspect ratio \(\eta = 3\) and height \(k =\) 10 mm was placed inside the laminar flat-plate boundary layer of the laminar water channel, University of Stuttgart. The freestream velocity \(u_\infty \) was altered to investigate roughness Reynolds numbers in the range \(\text {Re}_{kk} = u_k k \nu ^{-1} = 380\) to \(\text {Re}_{kk} = 950\). Time-resolved surface visualizations with the Temperature-Sensitive Paint (TSP) method were performed to visualize the flow structures near the wall. Different formations of small scale structures in the unsteady wake at transitional conditions were detected. The results from the surface are compared to results from visualizations at the top edge of the cylindrical roughness element. Changes in the system of laminar horseshoe vortices and the recirculation zone are well captured.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Gregory, N., Walker, W.S.: The effect on transition of isolated surface excrescence in the boundary layer. ARC Reports & Memoranda no. 2779, Aeronautical Research Council. HMSO, London (1956)
Cossu, C., Brandt, L.: On Tollmien-Schlichting-like waves in streaky boundary layers. Eur. J. Mech. B/Fluids 23(6), 815–833 (2004). https://doi.org/10.1016/j.euromechflu.2004.05.001
Sedney, R.: A survey of the effects of small proturbances on boundary-layer flows. AIAA J. 11(6), 782–792 (1973). https://doi.org/10.2514/3.50520
Ye, Q., Schrijer, F.F.J., Scarano, F.: Geometry effect of isolated roughness on boundary layer transition investigated by tomograpihc PIV. In: International Symposium on Turbulence and Shear Flow Phenomena (TSFP-9), 30 June–3 July 2015, Melbourne, Australia (2015)
Baker, C.J.: The laminar horseshoe vortex. J. Fluid Mech. 95, 347–367 (1979)
Liu, T., Sullivan, J.P.: Pressure and Temperature Sensitive Paints, 1st edn. Springer, Heidelberg (2005)
Fey, U., Egami, Y.: Transition-detection by temperature-sensitive paint. In: Tropea, C., Yarin, A.L., Foss, J.F. (eds.) Springer Handbook of Experimental Fluid Mechanics, Chap. 7.4. Springer, Berlin (2007)
Fey, U., Klein, C., Möller, T.J., Pöttner, J., Radespiel, R., Ondus, V., Beifuß, U.: Investigation of circular cylinder flow in water using temperature sensitive paint. In: Dillmann, A., et al. (eds.) New Results in Numerical & Experimental Fluid Mechanics VIII, NNFM, vol. 121, pp. 657–664. Springer, Heidelberg (2013)
Miozzi, M., Capone, A., Di Felice, F., Klein, C., Liu, T.: Global and local skin friction diagnostics from TSP surface patterns on an underwater cylinder in cross flow. Phys. Fluids 28, 124101 (2016). https://doi.org/10.1063/1.4968525
Lemarechal, J., Klein, C., Henne, U., Puckert, P., Rist, U.: Spatially and temporally resolved visualization of turbulent spots in Blasius boundary layer transition. In: 18th International Symposium on Flow Visualization, Zurich, Switzerland (2018). https://doi.org/10.1109/HPDC.2001.945188
Lemarechal, J., Mäteling, E., Klein, C., Puckert, P., Rist, U.: Reattaching flow behind a forward-backward facing step investigated with temperature-sensitive paint. In: Dillmann, A., et al. (eds.) New Results in Numerical & Experimental Fluid Mechanics XI, NNFM, vol. 136, pp. 285–294. Springer, Cham (2018)
Strunz M., Speth, J.F.: A new laminar water tunnel to study the transition process in a Blasius boundary layer and in a separation bubble and a new tool for industrial aerodynamics and hydrodynamic research. AGARD CP-413, pp. 25-1–25-5 (1987)
Puckert, D.K., Dieterle, M., Rist, U.: Reduction of freestream turbulence at low velocities. Exp. Fluids 58 (2017). https://doi.org/10.1007/s00348-017-2333-y
Ondrus, V., Meier, R.J., Klein, C., Henne, U., Schäferling, M., Beifuß, U.: Europium 1,3-di(thienyl)propane-1,3-diones with outstanding properties for temperature sensing. Sens. Actuators, A 233, 434–441 (2015). https://doi.org/10.1016/j.sna.2015.07.023
Mäteling, E., Lemarechal, J., Klein, C., Puckert, D.K., Rist, U.: Experimental investigation of mixed convection in horizontal channel flow in combination with cylindrical roughness elements. In: 21st STAB/DGLR Symposium STAB, Darmstadt, Germany (2018)
Puckert, D., Subasi, A., Rist, U., Gunes, H.: Experimental investigations of critical roughness heights in a laminar boundary layer. In: 13th International Symposium on Fluid Control, Measurement and Visualization FLUCOME 2015, 15–18 November 2015, Doha, Qatar (2015)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2020 Springer Nature Switzerland AG
About this paper
Cite this paper
Lemarechal, J., Mäteling, E., Klein, C., Puckert, D.K., Rist, U. (2020). Visualization of Near-Wall Structures of an Isolated Cylindrical Roughness Element in a Laminar Boundary Layer Without Pressure Gradient. 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_64
Download citation
DOI: https://doi.org/10.1007/978-3-030-25253-3_64
Published:
Publisher Name: Springer, Cham
Print ISBN: 978-3-030-25252-6
Online ISBN: 978-3-030-25253-3
eBook Packages: EngineeringEngineering (R0)