Experimental evidence of near-wall reverse flow events in a zero pressure gradient turbulent boundary layer

C. E. Willert; C. Cuvier; J. M. Foucaut; J. Klinner; M. Stanislas; J. P. Laval; S. Srinath; J. Soria; O. Amili; C. Atkinson; C. J. Kähler; S. Scharnowski; R. Hain; A. Schröder; R. Geisler; J. Agocs; A. Röse

doi:10.1016/j.expthermflusci.2017.10.033

Experimental evidence of near-wall reverse flow events in a zero pressure gradient turbulent boundary layer

C. E. Willert, C. Cuvier, J. M. Foucaut, J. Klinner, M. Stanislas, J. P. Laval, S. Srinath, J. Soria, O. Amili, C. Atkinson, C. J. Kähler, S. Scharnowski, R. Hain, A. Schröder, R. Geisler, J. Agocs, A. Röse

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Abstract

This study reports on experimentally observed rare near-wall reverse flow events in a fully developed turbulent flat plate boundary layer at zero pressure gradient with Reynolds numbers between Re_θ≈2500 and Re_θ≈8000 (Re_τ≈800–2400). The reverse flow events are captured using high magnification particle image velocimetry sequences with record lengths varying from 50 000 to 126 000 samples. Time resolved particle image sequences allow singular reverse flow events to be followed over several time steps whereas long records of nearly statistically independent samples provide a variety of single snapshots at a higher spatial resolution. The probability of occurrence lies in the order of 0.012–0.018% which matches predictions from direct numerical simulations (DNS). The typical size of the reverse flow bubble is about 30 wall units in length and 5 wall units in height which agrees well with similar observations made in existing DNS data.

Original language	English (US)
Pages (from-to)	320-328
Number of pages	9
Journal	Experimental Thermal and Fluid Science
Volume	91
DOIs	https://doi.org/10.1016/j.expthermflusci.2017.10.033
State	Published - Feb 2018
Externally published	Yes

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Publisher Copyright:
© 2017

Keywords

Boundary layer
Flow reversal
Particle image velocimetry
Turbulence statistics
Wall shear stress

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Willert, C. E., Cuvier, C., Foucaut, J. M., Klinner, J., Stanislas, M., Laval, J. P., Srinath, S., Soria, J., Amili, O., Atkinson, C., Kähler, C. J., Scharnowski, S., Hain, R., Schröder, A., Geisler, R., Agocs, J., & Röse, A. (2018). Experimental evidence of near-wall reverse flow events in a zero pressure gradient turbulent boundary layer. Experimental Thermal and Fluid Science, 91, 320-328. https://doi.org/10.1016/j.expthermflusci.2017.10.033

Willert, CE, Cuvier, C, Foucaut, JM, Klinner, J, Stanislas, M, Laval, JP, Srinath, S, Soria, J, Amili, O, Atkinson, C, Kähler, CJ, Scharnowski, S, Hain, R, Schröder, A, Geisler, R, Agocs, J & Röse, A 2018, 'Experimental evidence of near-wall reverse flow events in a zero pressure gradient turbulent boundary layer', Experimental Thermal and Fluid Science, vol. 91, pp. 320-328. https://doi.org/10.1016/j.expthermflusci.2017.10.033

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abstract = "This study reports on experimentally observed rare near-wall reverse flow events in a fully developed turbulent flat plate boundary layer at zero pressure gradient with Reynolds numbers between Reθ≈2500 and Reθ≈8000 (Reτ≈800–2400). The reverse flow events are captured using high magnification particle image velocimetry sequences with record lengths varying from 50 000 to 126 000 samples. Time resolved particle image sequences allow singular reverse flow events to be followed over several time steps whereas long records of nearly statistically independent samples provide a variety of single snapshots at a higher spatial resolution. The probability of occurrence lies in the order of 0.012–0.018% which matches predictions from direct numerical simulations (DNS). The typical size of the reverse flow bubble is about 30 wall units in length and 5 wall units in height which agrees well with similar observations made in existing DNS data.",

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author = "Willert, {C. E.} and C. Cuvier and Foucaut, {J. M.} and J. Klinner and M. Stanislas and Laval, {J. P.} and S. Srinath and J. Soria and O. Amili and C. Atkinson and K{\"a}hler, {C. J.} and S. Scharnowski and R. Hain and A. Schr{\"o}der and R. Geisler and J. Agocs and A. R{\"o}se",

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doi = "10.1016/j.expthermflusci.2017.10.033",

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AU - Willert, C. E.

AU - Cuvier, C.

AU - Foucaut, J. M.

AU - Klinner, J.

AU - Stanislas, M.

AU - Laval, J. P.

AU - Srinath, S.

AU - Soria, J.

AU - Amili, O.

AU - Atkinson, C.

AU - Kähler, C. J.

AU - Scharnowski, S.

AU - Hain, R.

AU - Schröder, A.

AU - Geisler, R.

AU - Agocs, J.

AU - Röse, A.

PY - 2018/2

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N2 - This study reports on experimentally observed rare near-wall reverse flow events in a fully developed turbulent flat plate boundary layer at zero pressure gradient with Reynolds numbers between Reθ≈2500 and Reθ≈8000 (Reτ≈800–2400). The reverse flow events are captured using high magnification particle image velocimetry sequences with record lengths varying from 50 000 to 126 000 samples. Time resolved particle image sequences allow singular reverse flow events to be followed over several time steps whereas long records of nearly statistically independent samples provide a variety of single snapshots at a higher spatial resolution. The probability of occurrence lies in the order of 0.012–0.018% which matches predictions from direct numerical simulations (DNS). The typical size of the reverse flow bubble is about 30 wall units in length and 5 wall units in height which agrees well with similar observations made in existing DNS data.

AB - This study reports on experimentally observed rare near-wall reverse flow events in a fully developed turbulent flat plate boundary layer at zero pressure gradient with Reynolds numbers between Reθ≈2500 and Reθ≈8000 (Reτ≈800–2400). The reverse flow events are captured using high magnification particle image velocimetry sequences with record lengths varying from 50 000 to 126 000 samples. Time resolved particle image sequences allow singular reverse flow events to be followed over several time steps whereas long records of nearly statistically independent samples provide a variety of single snapshots at a higher spatial resolution. The probability of occurrence lies in the order of 0.012–0.018% which matches predictions from direct numerical simulations (DNS). The typical size of the reverse flow bubble is about 30 wall units in length and 5 wall units in height which agrees well with similar observations made in existing DNS data.

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KW - Flow reversal

KW - Particle image velocimetry

KW - Turbulence statistics

KW - Wall shear stress

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ER -

Experimental evidence of near-wall reverse flow events in a zero pressure gradient turbulent boundary layer

Abstract

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Keywords

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