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

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Title: Evolution of the Flow Structure in the Gap and Near Wake of Two Tandem Cylinders in the AG Regime.
Authors: Shan, Xiangjun1 e_dm@163.com, Sun, Fangjin2,3 x_j_shan@outlook.com
Source: Fluid Dynamics. May2021, Vol. 56 Issue 3, p309-320. 12p.
Subjects: Fluid flow, Quasistatic processes, Engine cylinders, Accuracy, Vortex motion
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. [ABSTRACT FROM AUTHOR]
Copyright of Fluid Dynamics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Evolution of the Flow Structure in the Gap and Near Wake of Two Tandem Cylinders in the AG Regime.
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  Data: <searchLink fieldCode="JN" term="%22Fluid+Dynamics%22">Fluid Dynamics</searchLink>. May2021, Vol. 56 Issue 3, p309-320. 12p.
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  Data: 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. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Fluid Dynamics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1134/S0015462821030095
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        Text: English
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      – SubjectFull: Fluid flow
        Type: general
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      – SubjectFull: Engine cylinders
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      – SubjectFull: Accuracy
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      – SubjectFull: Vortex motion
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