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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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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.

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Funding

This work was supported by the National Natural Science Foundation of China (grant number 51108345), the State Key Laboratory for Civil Engineering and Disaster Prevention of China (grant number SLDRCE-MB-04), the Guangxi Key Laboratory of New Energy and Building Energy Saving (grant number 19-J-21-14), the Joint Cultivation Program of National Natural Science Foundations of Guangxi (grant number 2019JJA160127), the Guangxi Youth Innovative Talents Research Project (grant number 2019AC20022), the Special Talent Foundations of Guilin University of Technology (grant numbers RD19100163 and RD19100166), and the Liaoning Provincial Department of Education (grant number LJYL030).

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Authors and Affiliations

  1. College of Mechanics and Engineering, Liaoning Technical University, 123000, Fuxin, China

    Xiangjun Shan

  2. Guangxi Key Laboratory of New Energy and Building Energy Saving, 541004, Guilin, China

    Fangjin Sun

  3. College of Civil and Architectural Engineering, Guilin University of Technology, 541000, Guilin, China

    Fangjin Sun

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  1. Xiangjun Shan
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Correspondence to Xiangjun Shan or Fangjin Sun.

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Shan, X., Sun, F. Evolution of the Flow Structure in the Gap and Near Wake of Two Tandem Cylinders in the AG Regime. Fluid Dyn 56, 309–320 (2021). https://doi.org/10.1134/S0015462821030095

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  • DOI: https://doi.org/10.1134/S0015462821030095

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