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Fluid Dynamics
Erschienen in: Fluid Dynamics 3/2021

01.05.2021

Evolution of the Flow Structure in the Gap and Near Wake of Two Tandem Cylinders in the AG Regime

verfasst von: Xiangjun Shan, Fangjin Sun

Erschienen in: Fluid Dynamics | Ausgabe 3/2021

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Abstract—

A high-order discontinuous Galerkin method is employed to study the evolution of the flow structure in the gap and near wake of two tandem cylinders in the alternating in the gap (AG) regime. The transient characteristics of the flow, vorticity, and pressure fields, the transient circumferential pressure distribution, and the streamwise velocity along the centerline of the wake are studied under a Reynolds number of 200 and a pitch ratio of 2.3. The results show that the gap-flow occurs between the two tandem cylinders in the AG regime, and the gap-flow interacts with quasistatic vortices in the gap to cause unilateral or bilateral reattachment of the separated shear layer. In addition, under the influence of the gap-flow, a near-wake vortex is generated behind the downstream cylinder, which significantly affects the length of the recirculation bubble. Finally, the physical mechanism of reattachment of the shear layer and the generation of gap-flow in the AG regime are discussed.
Nächster Artikel Generalization of Joukowski’s Solution for a Bubble in a Channel

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Metadaten
Titel
Evolution of the Flow Structure in the Gap and Near Wake of Two Tandem Cylinders in the AG Regime
verfasst von
Xiangjun Shan
Fangjin Sun
Publikationsdatum
01.05.2021
Verlag
Pleiades Publishing
Erschienen in
Fluid Dynamics / Ausgabe 3/2021
Print ISSN: 0015-4628
Elektronische ISSN: 1573-8507
DOI
https://doi.org/10.1134/S0015462821030095

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