Eulerian and Lagrangian Insights into a Turbulent Boundary Layer Flow Using Time Resolved Tomographic PIV
Turbulent boundary layer (TBL) flow consists of manifold temporal and spatial scales and is governed by the organization and decay of self-sustaining coherent flow structures driven by entrained high momentum fluid. Generic flow structures such as hairpin-like vortices and spanwise alternating wall bounded low- and high-speed streaks have been observed and extensively analyzed with both experimental and numerical methods. The role of these structures for the wall normal and spanwise fluid exchange has been highlighted mostly within an Eulerian reference frame. But for an understanding of the momentum exchange in turbulent wall flows a step towards a spatially resolved Lagrangian frame of reference would be advantageous. The data achieved from the present application of time-resolved tomographic PIV to a flat plate turbulent boundary layer flow enables for the first time the investigation of the flow structures and related particle motions within a temporally and spatially resolved Lagrangian and Eulerian frame of reference.
KeywordsTurbulent Boundary Layer Particle Tracking Velocimetry Turbulent Spot Tomographic Particle Image Velocimetry Turbulent Boundary Layer Flow
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- 2.Biferale, L., Boffetta, G., Celani, A., Lanotte, A., Toschi, E.: Lagrangian statistics in fully developed turbulence. Journal of Turbulence 7(6) (2006)Google Scholar
- 5.Robinson, S.K.: The kinematics of turbulent boundary layer structure. NASA Technical Memorandum, 103859 (1991)Google Scholar
- 6.Meinhart, C.D.: Investigation of turbulent boundary-layer structure using Particle-Image Velocimetry Thesis, University of Illinois at Urbana-Champaign (1994)Google Scholar
- 7.Schoppa, W., Hussain, F.: Genesis and dynamics of coherent structures in near-wall turbulence. In: Panton, R. (ed.) Self-sustaining Mechanisms of Wall Turbulence, pp. 385–422. Computational Mechanics Publications (1997)Google Scholar
- 9.Kähler, C.J.: The significance of coherent flow structures for the turbulent mixing in wall-bounded flows. Dissertation, DLR Forschungsbericht 2004 -24 (2004) ISSN 1434-8454 Google Scholar
- 11.Schröder, A., Geisler, R., Elsinga, G.E., Scarano, F., Dierksheide, U.: Investigation of a turbulent spot using time-resolved tomographic PIV., CD-Rom, Paper 1.4. In: Proceedings, 13th International Symposium on Applications of Laser Techniques to Fluid Mechanics, Lisbon (Portugal), June 26-29 (2006)Google Scholar
- 17.Lüthi, B.: Some Aspects of Strain, Vorticity and Material Element Dynamics as Measured with 3D Particle Tracking Velocimetry in a Turbulent Flow. Dissertation (2002)Google Scholar