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Flow Statistics in the Transitional Regime of Plane Channel Flow

Abstract : The transitional regime of plane channel flow is investigated away from the transitional point below which turbulence is not sustained, using direct numerical simulation in large domains. Statistics of laminar-turbulent spatiotemporal intermittency are reported. The geometry of the pattern is first characterized, including statistics for the angles of the laminar-turbulent stripes observed in this regime, with a comparison to experiments. High-order statistics of the local and instantaneous bulk velocity, wall shear stress and turbulent kinetic energy are then provided. The distributions of the two former quantities have non trivial shapes, characterized by a large kurtosis and/or skewness. Interestingly, we observe a strong linear correlation between their kurtosis and their skewness squared, which is usually reported at much higher Reynolds number in the fully turbulent regime.
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https://hal.archives-ouvertes.fr/hal-03032458
Contributor : Yohann Duguet Connect in order to contact the contributor
Submitted on : Monday, November 30, 2020 - 8:09:23 PM
Last modification on : Sunday, June 26, 2022 - 2:59:00 AM
Long-term archiving on: : Monday, March 1, 2021 - 8:04:37 PM

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Pavan V Kashyap, yohann Duguet, Olivier Dauchot. Flow Statistics in the Transitional Regime of Plane Channel Flow. Entropy, MDPI, 2020, 22 (9), pp.1001. ⟨10.3390/e22091001⟩. ⟨hal-03032458⟩

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