On the nature of intermittency in a turbulent von Kármán flow

Faller, Hugues; Geneste, D.; Chaabo, Tarek; Cheminet, A.; Valori, Valentina; Ostovan, Yaşar; Cappanera, Loïc; Cuvier, Ch.; Daviaud, François; Foucaut, Jean-Marc; Guermond, Jean‐Luc; Laval, Jean-Philippe; Nore, Caroline; Padilla, Vincent; Wiertel, Cécile; Dubrulle, Bérengère

doi:10.1017/jfm.2020.908

Cited by 15 publications

(9 citation statements)

References 33 publications

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“…In summary one retrieves the important result detailed above concerning the dissipation, namely that dissipation occurs on a short time scale, of the order of the correlation time of the acceleration. This result agrees with dissipative time scale deduced in [16] (which is a purely spatial study, although our method is dynamic)…”

Section: B Von Karman Experimentssupporting

confidence: 90%

“…This paper gives a precise definition of irreversibility in turbulent flows, related to the hypothesis of cascade (studied in [15]) from large spatial scales to small ones where dissipation takes place. More recently the phenomena of energy transfer and dissipation, which imply both irreversibility, were considered [16]- [17]- [18]- [19] outside its connection with singularities. Our idea is to investigate those two phenomena in connection with singular events.…”

Section: Irreversibility and Dissipationmentioning

confidence: 99%

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Singularities in turbulent flows: How to observe them?

Berre

Lehner

Pomeau

2023

Physica D: Nonlinear Phenomena

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Section: B Von Karman Experimentssupporting

confidence: 90%

Section: Irreversibility and Dissipationmentioning

confidence: 99%

Singularities in turbulent flows: How to observe them?

Berre

Lehner

Pomeau

2023

Physica D: Nonlinear Phenomena

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“…They often represent small-scale extreme events both in Lagrangian [13][14][15] and Eulerian [16,17] measurements due to the very large spatial gradients they support. They are also being identified as mediators of singular dissipation [18,19].…”

Section: Introductionmentioning

confidence: 99%

Geometric characterization of vortex lines in turbulence

Kapoor¹,

Govindarajan²,

Mukherjee³

2023

Preprint

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Vorticity in turbulent flows is often organized into complex geometries that influence the dynamics. We use a relatively novel approach to describe these geometries: that of obtaining segments of vortex lines embedded in the flow. This enables us to quantify the geometric features of these objects. Vortex lines differ widely in their behaviour but we find some unifying features. The decay from high levels of vorticity is shown to happen over a short fraction of the vortex length. The local curvature is inversely related with the vorticity magnitude. Strong parts of vortex lines bundle together. It is hoped that this first work will generate interest in such quantification and the physics of vortex dynamics in turbulence.

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“…Higher-degree velocity differences, for instance using wavelet analysis [30] and coarsegraining [31], have been proposed as unbiased quantities to study Eulerian and Lagrangian statistics, and as a way to detect high-order singularities in the velocity field. In the Eulerian frame, they provide a robust and straightforward technique to quantify intermittency in a signal with a steep power spectrum, such as those observed in surface wave turbulence [32].…”

Section: Introductionmentioning

confidence: 99%

Multi-time structure functions and the Lagrangian scaling of turbulence

Angriman,

Mininni,

Cobelli

2022

Preprint

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We define and characterize multi-time Lagrangian structure functions using data stemming from two swirling flows with mean flow and turbulent fluctuations: A Taylor-Green numerical flow, and a von Kármán laboratory experiment. Data is obtained from numerical integration of tracers in the former case, and from three-dimensional particle tracking velocimetry measurements in the latter. Multi-time statistics are shown to decrease the contamination of the mean flow in the inertial range scaling. A time scale at which contamination from the mean flow becomes dominant is identified, with this scale separating two different Lagrangian scaling ranges. The results from the multi-time structure functions also indicate that Lagrangian intermittency is not a result of large-scale flow effects. The multitime Lagrangian structure functions can be used without prior knowledge of the forcing mechanisms or boundary conditions, allowing their application in different flow geometries.

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On the nature of intermittency in a turbulent von Kármán flow

Abstract: Abstract

Cited by 15 publications

References 33 publications

Singularities in turbulent flows: How to observe them?

Singularities in turbulent flows: How to observe them?

Geometric characterization of vortex lines in turbulence

Multi-time structure functions and the Lagrangian scaling of turbulence

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