Large scale organization of a near wall turbulent boundary layer
| Autor: | R. Dekou, Joel Delville, Jean-Marc Foucaut, Stéphane Roux, Michel Stanislas |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Scale (ratio) Turbulence Mechanical Engineering Reynolds number Mechanics Condensed Matter Physics Boundary layer thickness 01 natural sciences 010305 fluids & plasmas Vortex Physics::Fluid Dynamics Momentum Boundary layer symbols.namesake 0103 physical sciences symbols 010306 general physics Wind tunnel |
| Zdroj: | International Journal of Heat and Fluid Flow. 61:12-20 |
| ISSN: | 0142-727X |
| DOI: | 10.1016/j.ijheatfluidflow.2016.04.005 |
| Popis: | An experimental database at a Reynolds number Reθ based on momentum thickness close to 9800, was obtained in the Laboratoire de Mecanique de Lille wind tunnel with stereo-PIV (SPIV) and Hot Wires Anemometry (HWA) (Delville et al., wallturb joined experiment to assess the large scale structures in a high reynolds number turbulent boundary layer. In: Progress in Wall Turbulence: Understanding and Modeling. Springer; 2011. p. 65–73.); using a Linear Stochastic Estimation procedure based on correlations computation, a 3 component field is reconstructed here at high frequency from stereo-PIV at 4 Hz and hot wire data at 30 kHz. The present paper describes the results obtained on large scale coherent structures (uniform momentum regions and vortices) by post-processing this reconstruction. Structures are characterized (size, intensity and life time), and results are discussed with emphasis on the spatio-temporal organization of the coherent structures and their energetic contribution to the flow. |
| Databáze: | OpenAIRE |
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