Extreme events of turbulent kinetic energy production and dissipation in turbulent channel flow: particle image velocimetry measurements

Zaripov, Dinar; Li, Renfu; Saushin, I. I.

doi:10.1080/14685248.2020.1727914

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…We have found for BF events that the turbulence production events associated with ejections are not extremely high, which agrees with the findings of Zaripov et al. (2020) for turbulent channel flow.…”

Section: Conditional Production and Dissipationsupporting

confidence: 93%

“…The present results on the EP conditional fields of turbulence production are consistent with the recent experimental study conducted by Zaripov, Li & Saushin (2020) for turbulent channel flow, who reported that extremely high turbulent kinetic energy (TKE) production events occur at the viscous sublayer, below sweep events and quasi-streamwise vortices located at the buffer region. We have found for BF events that the turbulence production events associated with ejections are not extremely high, which agrees with the findings of Zaripov et al.…”

Section: Conditional Production and Dissipationsupporting

confidence: 92%

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Extreme wall shear stress events in turbulent pipe flows: spatial characteristics of coherent motions

2020

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Section: Conditional Production and Dissipationsupporting

confidence: 93%

Section: Conditional Production and Dissipationsupporting

confidence: 92%

Extreme wall shear stress events in turbulent pipe flows: spatial characteristics of coherent motions

2020

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“…It is interesting to notice at this stage that this wall location is also the place of a peak of production of TKE. (Part of the present results have been recently confirmed by the contribution of Zaripov, Li & Saushin (2020) who did study the extreme events of dissipation near the wall with the help of high-speed planar PIV. Their figure 7 is in fairly good agreement with what is observed in figure 26 here: the dissipation very near the wall, which is dominated by is mostly located at the bottom of the high-speed streaks.…”

Section: Dissipation In the Near-wall Regionsupporting

confidence: 80%

A critical analysis of turbulence dissipation in near-wall flows, based on stereo particle image velocimetry and direct numerical simulation data

et al. 2022

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An experiment was performed using stereo particle image velocimetry (SPIV) in the Laboratoire de Mécanique des Fluides de Lille boundary layer facility to determine all the derivative moments needed to estimate the average dissipation rate of the turbulence kinetic energy $\epsilon = 2 \nu \langle {\mathsf{s}}_{ij}{\mathsf{s}}_{ij} \rangle$ , where ${\mathsf{s}}_{ij}$ is the fluctuating strain rate and $\langle ~\rangle$ denotes ensemble averages. Also measured were all the moments of the full average deformation rate tensor, as well as all of the first, second and third fluctuating velocity moments except those involving pressure. The Reynolds number was $Re_\theta = 7634$ or $Re_\tau = 2598$ . The present paper gives the measured average dissipation, $\epsilon$ and the derivative moments comprising it. The results are compared with the earlier measurements of Balint, Wallace & Vukolavcevic (J. Fluid Mech., vol. 228, 1991, pp. 53–86) and Honkan & Andreopoulos (J. Fluid Mech., vol. 350, 1997, pp. 29–96) at lower Reynolds numbers and to new results from a plane channel flow DNS at comparable Reynolds number. Of special interest is the prediction by George & Castillo (Appl. Mech. Rev., vol. 50, 1997, pp. 689–729) and Wosnik, Castillo & George (J. Fluid Mech., vol. 421, 2000, pp. 115–145) that $\epsilon ^+ \propto {x_2^+}^{-1}$ for streamwise homogeneous flows and a nearly indistinguishable power law, $\epsilon \propto {x_2^+}^{\gamma -1}$ , for boundary layers. In spite of the modest Reynolds number, the predictions seem to be correct. Then the statistical character of the velocity derivatives is examined in detail, and a particular problem is identified with the breakdown of local homogeneity inside $x_2^+ = 100$ . A more general alternative for partially homogeneous turbulence flows is offered which is consistent with the observations. With the help of DNS, the spatial characteristics of the dissipation very near the wall are also examined in detail.

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Backflow phenomenon in converging and diverging channels

Zaripov

Lukyanov

et al. 2022

Exp Fluids

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Extreme events of turbulent kinetic energy production and dissipation in turbulent channel flow: particle image velocimetry measurements

Cited by 6 publications

References 30 publications

Extreme wall shear stress events in turbulent pipe flows: spatial characteristics of coherent motions

Extreme wall shear stress events in turbulent pipe flows: spatial characteristics of coherent motions

A critical analysis of turbulence dissipation in near-wall flows, based on stereo particle image velocimetry and direct numerical simulation data

Backflow phenomenon in converging and diverging channels

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