We suggest an approach to probing intermittency corrections to the Kolmogorov law in turbulent flows based on the autoregressive moving-average modeling of turbulent time series. We introduce an index Υ that measures the distance from a Kolmogorov-Obukhov model in the autoregressive moving-average model space. Applying our analysis to particle image velocimetry and laser Doppler velocimetry measurements in a von Kármán swirling flow, we show that Υ is proportional to traditional intermittency corrections computed from structure functions. Therefore, it provides the same information, using much shorter time series. We conclude that Υ is a suitable index to reconstruct intermittency in experimental turbulent fields.

Faranda, D., Dubrulle, B., Daviaud, F., Pons, F.M.E. (2014). Probing turbulence intermittency via autoregressive moving-average models. PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS, 90(6), 061001-061004 [10.1103/PhysRevE.90.061001].

Probing turbulence intermittency via autoregressive moving-average models

Pons, Flavio Maria Emanuele
2014

Abstract

We suggest an approach to probing intermittency corrections to the Kolmogorov law in turbulent flows based on the autoregressive moving-average modeling of turbulent time series. We introduce an index Υ that measures the distance from a Kolmogorov-Obukhov model in the autoregressive moving-average model space. Applying our analysis to particle image velocimetry and laser Doppler velocimetry measurements in a von Kármán swirling flow, we show that Υ is proportional to traditional intermittency corrections computed from structure functions. Therefore, it provides the same information, using much shorter time series. We conclude that Υ is a suitable index to reconstruct intermittency in experimental turbulent fields.
2014
Faranda, D., Dubrulle, B., Daviaud, F., Pons, F.M.E. (2014). Probing turbulence intermittency via autoregressive moving-average models. PHYSICAL REVIEW E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS, 90(6), 061001-061004 [10.1103/PhysRevE.90.061001].
Faranda, Davide; Dubrulle, Bérengère; Daviaud, François; Pons, Flavio Maria Emanuele
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/629734
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