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. |
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| 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] |
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| Database: | Engineering Source |
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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. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 00154628 |
| DOI: | 10.1134/S0015462821030095 |
