The growth mechanism of turbulent bands in channel flow at low Reynolds numbers
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Publication:5205687
DOI10.1017/JFM.2019.899zbMATH Open1430.76322arXiv1910.12254OpenAlexW2981709959WikidataQ126770610 ScholiaQ126770610MaRDI QIDQ5205687
Author name not available (Why is that?)
Publication date: 16 December 2019
Published in: (Search for Journal in Brave)
Abstract: In this work, we carried out direct numerical simulations in large channel domains and studied the kinematics and dynamics of fully localised turbulent bands at Reynolds number Re = 750. Our results show that the downstream end of the band features fast streak generation and travels into the adjacent laminar flow, whereas streaks at the upstream end continually and relatively more slowly decay. This asymmetry is responsible for the transverse growth of the band. We particularly investigated the mechanism of streak generation at the downstream end, which engines the growth of the band. We identified a spanwise inflectional instability associated with the local mean flow near the downstream end and our results strongly suggest that this instability is responsible for the streak generation and ultimately for the growth of the band. Based on our study, we propose a possible self-sustaining mechanism of fully localised turbulent bands at low Reynolds numbers in channel flow.
Full work available at URL: https://arxiv.org/abs/1910.12254
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