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ISSN オンライン: 2642-0554

TIME-RESOLVED RECONSTRUCTION OF SUPER-STREAKS IN HIGH REYNOLDS NUMBER TURBULENT BOUNDARY LAYER OVER A FLAT PLATE

Stephane Roux
LMT Cachan, ENS Cachan/CNRS/UPMC/PRES UniverSud Paris; and Laboratoire d'Etudes Aérodynamique (LEA), Université de Poitiers, ENSMA, CNRS, France

Franck Kerherve
Institut PPRIME - UPR 3346 CNRS - University of Poitiers - ENSMA Dept. Fluides, Thermique, Combustion Poitiers, France

Jean-Marc Foucaut
Laboratoire de Mécanique de Lille, UMR CNRS 8107 Bv Paul Langevin, Cité Scientifique F-59655 Villeneuve d'Ascq, France; Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC) Monash University, VIC 3800 Australia

Michel Stanislas
Laboratoire de Mécanique de Lille, UMR CNRS 8107 Bv Paul Langevin, Cité Scientifique F-59655 Villeneuve d'Ascq, France; Laboratory for Turbulence Research in Aerospace and Combustion (LTRAC) Monash University, VIC 3800 Australia

Joel Delville
Department of Fluid Flow, Heat Transfer and Combustion Institute Pprime - UPR 3346 - CNRS - Universite de Poitiers - ENSMA CEAT - F86036 Poitiers cedex, France

要約

A methodology for examination of super-structures in a zero pressure gradient boundary layer at Reynolds number of 10000 is presented. These structures are characterised by a large degree of persistence and are thought to participate actively to the turbulence regeneration in near-wall region (Mathis et al., 2011). A time-resolved estimate of the three-dimensional structure of these entities is obtained by combining low-speed two-dimensional stereo-PIV (Particle Image Velocimetry) and a two-dimensional rake of 143 single hot-wire probes. The latter is used to animate the PIV data, initially sampled at 4Hz, at a higher sampling rate. This is effected using linear stochastic estimation (LSE) with a multi-time delay formulation. The potential of the methodology for eduction of the very large low-speed streaks and the associated hairpin vortices is discussed.