Time-resolved PIV measurements of a self-similar adverse pressure gradient turbulent boundary layer

Callum Atkinson; Abel-John Buchner; Micheal Eisfelder; Vassili Kitsios; Julio Soria

Time-resolved PIV measurements of a self-similar adverse pressure gradient turbulent boundary layer

Callum Atkinson, Abel-John Buchner, Micheal Eisfelder, Vassili Kitsios, Julio Soria

Mechanical & Aerospace Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review

Abstract

A methodology for the rapid determination of turbulent statistics is presented to enable the efficient non-intrusive evaluation of velocity profiles using a compact continuous-wave laser PIV system, particularly useful in cases where an experimental facility or model must be modified or repositioned in order to achieve a desired flow condition. In the present work this approach is used to guide the adjustment of a flexible roof in a large water tunnel in order to establish an ideally self-similar adverse pressure gradient turbulent boundary layer at the verge of separation. Following the feedback from real-time velocity statistics the height of the roof is adjust until a self-similar mean velocity profile was achieved while maintaining a small bias towards instantaneously attached flow. Initial results show an excellent collapse in the mean streamwise velocity profile over a extent of more than two boundary layer thickness with momentum thickness based Reynolds numbers ranging from Re_δ2= 7500 to 8800, yet a trend of increasing peak Reynolds stress is observed with downstream position. Despite this trend the average profiles across this domain are in agreement with recent complementary direct numerical simulations

Original language	English
Title of host publication	Proceedings of the 18^th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Subtitle of host publication	Lisbon, Portugal, July 4 - 7, 2016
Editors	D. F. G. Durão, K. Hishida, E. K. Longmire, A. L. Moreira, C. Tropea
Publisher	Springer-Verlag London Ltd.
Number of pages	13
ISBN (Electronic)	9789899877788
Publication status	Published - 2016
Event	International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 2016 - The Calouste Gulbenkian Foundation, Lisbon, Portugal Duration: 4 Jul 2016 → 7 Jul 2016 Conference number: 18th http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/

Conference

Conference	International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 2016
Country	Portugal
City	Lisbon
Period	4/07/16 → 7/07/16
Other	often referred to simply as the "Lisbon Symposia
Internet address	http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/

Keywords

PIV
Turbulent boundary layers
Adverse pressure gradient
Separation
Self-similarity

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Cite this

Atkinson, C., Buchner, A-J., Eisfelder, M., Kitsios, V., & Soria, J. (2016). Time-resolved PIV measurements of a self-similar adverse pressure gradient turbulent boundary layer. In D. F. G. Durão, K. Hishida, E. K. Longmire, A. L. Moreira, & C. Tropea (Eds.), Proceedings of the 18^th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal, July 4 - 7, 2016 Springer-Verlag London Ltd.. http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/finalworks2016/papers/03.7_3_71paper.pdf

Atkinson, Callum ; Buchner, Abel-John ; Eisfelder, Micheal ; Kitsios, Vassili ; Soria, Julio. / Time-resolved PIV measurements of a self-similar adverse pressure gradient turbulent boundary layer. Proceedings of the 18^th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal, July 4 - 7, 2016. editor / D. F. G. Durão ; K. Hishida ; E. K. Longmire ; A. L. Moreira ; C. Tropea. Springer-Verlag London Ltd., 2016.

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abstract = "A methodology for the rapid determination of turbulent statistics is presented to enable the efficient non-intrusive evaluation of velocity profiles using a compact continuous-wave laser PIV system, particularly useful in cases where an experimental facility or model must be modified or repositioned in order to achieve a desired flow condition. In the present work this approach is used to guide the adjustment of a flexible roof in a large water tunnel in order to establish an ideally self-similar adverse pressure gradient turbulent boundary layer at the verge of separation. Following the feedback from real-time velocity statistics the height of the roof is adjust until a self-similar mean velocity profile was achieved while maintaining a small bias towards instantaneously attached flow. Initial results show an excellent collapse in the mean streamwise velocity profile over a extent of more than two boundary layer thickness with momentum thickness based Reynolds numbers ranging from Reδ2= 7500 to 8800, yet a trend of increasing peak Reynolds stress is observed with downstream position. Despite this trend the average profiles across this domain are in agreement with recent complementary direct numerical simulations",

keywords = "PIV, Turbulent boundary layers, Adverse pressure gradient, Separation, Self-similarity",

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Atkinson, C, Buchner, A-J, Eisfelder, M, Kitsios, V & Soria, J 2016, Time-resolved PIV measurements of a self-similar adverse pressure gradient turbulent boundary layer. in DFG Durão, K Hishida, EK Longmire, AL Moreira & C Tropea (eds), Proceedings of the 18^th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal, July 4 - 7, 2016. Springer-Verlag London Ltd., International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics 2016, Lisbon, Portugal, 4/07/16. <http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2016/finalworks2016/papers/03.7_3_71paper.pdf>

Time-resolved PIV measurements of a self-similar adverse pressure gradient turbulent boundary layer. / Atkinson, Callum; Buchner, Abel-John; Eisfelder, Micheal; Kitsios, Vassili; Soria, Julio.

Proceedings of the 18^th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal, July 4 - 7, 2016. ed. / D. F. G. Durão; K. Hishida; E. K. Longmire; A. L. Moreira; C. Tropea. Springer-Verlag London Ltd., 2016.

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › Research › peer-review

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AB - A methodology for the rapid determination of turbulent statistics is presented to enable the efficient non-intrusive evaluation of velocity profiles using a compact continuous-wave laser PIV system, particularly useful in cases where an experimental facility or model must be modified or repositioned in order to achieve a desired flow condition. In the present work this approach is used to guide the adjustment of a flexible roof in a large water tunnel in order to establish an ideally self-similar adverse pressure gradient turbulent boundary layer at the verge of separation. Following the feedback from real-time velocity statistics the height of the roof is adjust until a self-similar mean velocity profile was achieved while maintaining a small bias towards instantaneously attached flow. Initial results show an excellent collapse in the mean streamwise velocity profile over a extent of more than two boundary layer thickness with momentum thickness based Reynolds numbers ranging from Reδ2= 7500 to 8800, yet a trend of increasing peak Reynolds stress is observed with downstream position. Despite this trend the average profiles across this domain are in agreement with recent complementary direct numerical simulations

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Y2 - 4 July 2016 through 7 July 2016

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Atkinson C, Buchner A-J, Eisfelder M, Kitsios V, Soria J. Time-resolved PIV measurements of a self-similar adverse pressure gradient turbulent boundary layer. In Durão DFG, Hishida K, Longmire EK, Moreira AL, Tropea C, editors, Proceedings of the 18^th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics: Lisbon, Portugal, July 4 - 7, 2016. Springer-Verlag London Ltd. 2016