Spatially and temporally resoved 2C-2D PIV in the inner layer of a high Reynolds number adverse pressure gradient turbulent boundary layer

J. Soria, C. Willert, O. Amili, J. Klinner, C. Atkinson, M. Stanislas, A. Schroder, R. Geisler, J. Agocs, A. Rose, C. J Kahler, S. Scharnowski, R. Hain, J. M. Foucaut, C. Cuvier, S. Srinath, J. P. Laval

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Abstract

A joint experiment was performed in May 2015 in the framework of the European Project EuHIT: "European High performance Infrastructures in Turbulence". One of the aims was a detailed study of a high Reynolds number turbulent boundary layer flow under adverse pressure gradient (APG-TBL) to determine the effect of the pressure gradient on the spatio-temporal character of structures in the inner layer. Highly spatially resolved time series of up to 38 s duration of the streamwise and wall-normal velocity component were measured using 2C-2D PIV with single-exposed image pairs acquired at frequencies up to 6.7 kHz. The domain of these 2C-2D velocity field measurements spanned 5 x 25 mm2 corresponding to a domain of up to 85+ x 426+ with the spatial resolution of the velocity measurements ranging from 0.4+ to 0.7+. Using these highly spatially and temporally resolved velocity measurements, time series of the wall-shear stress, spectra of the velocities, statistics and other pertinent characteristics of the APG-TBL were extracted and analysed. 2C-2D PIV using a sCMOS camera with 2560 x 2160 px resolution and 16 bit dynamic range was undertaken in streamwise–spanwise planes spanning 14.6 x 17.3 mm2, which corresponds to a domain of up to 250+ x 300+.The spatial resolution of these velocity measurements is 0.9+. The camera was equipped with a Zeiss lens of 100 mm focal length with a teleconverter. f2 was used for these experiments, resulting in an estimated depth of-field of 170 µm and a diffraction limited diameter of approximately 10 µm. These measurements provide pertinent spanwise characteristics of the low and high momentum zones at different wall-normal distances in the APG-TBL.
Original languageEnglish
Title of host publicationProceedings of the 18th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Subtitle of host publicationLisbon, Portugal, July 4 - 7, 2016
EditorsD. F. G. Durão, K. Hishida, E. K. Longmire, A. L. Moreira, C. Tropea
PublisherSpringer-Verlag London Ltd.
Number of pages11
ISBN (Electronic)9789899877788
Publication statusPublished - 2016
EventInternational Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 2016 - The Calouste Gulbenkian Foundation, Lisbon, Portugal
Duration: 4 Jul 20167 Jul 2016
Conference number: 18th
http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/

Conference

ConferenceInternational Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 2016
CountryPortugal
CityLisbon
Period4/07/167/07/16
Otheroften referred to simply as the "Lisbon Symposia
Internet address

Keywords

  • PIV
  • Turbulent boundary layer
  • Adverse pressure gradient
  • Temporally resolved velocity profiling
  • Spanwise structures

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