Trigger turbulent bands directly at low Reynolds numbers in channel flow using a moving-force technique

DOI10.1017/JFM.2020.636zbMATH Open1460.76403arXiv2007.08882OpenAlexW3042414927MaRDI QIDQ5126130

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Publication date: 15 October 2020

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Abstract: We show a method, for direct numerical simulations, to trigger and maintain turbulent bands directly at low Reynolds numbers in channel flow. The key is to impose a moving localised force which induces a local flow with sufficiently strong inflectional instability. With the method, we can trigger and maintain turbulent bands at Reynolds numbers down to $Resimeq500$. More importantly, we can generate any band patterns with desired relative position and orientation. The usual perturbation approach resorts to turbulent fields simulated at higher Reynolds numbers, random noise, or localised vortical perturbation, which neither assures a successful generation of bands at low Reynolds numbers nor offers a control on the orientation of the generated bands. A precise control on the position and orientation of turbulent bands is important for the investigation of all possible types of band interaction and for understanding the transition in channel flow at low Reynolds numbers.

Full work available at URL: https://arxiv.org/abs/2007.08882

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