Coherent Structures in the Breakdown Bubble of a Vortex Flow
Helical structures downstream of the breakdown bubble of the Grabowski vortex profile at Reynolds numbers of Re≤500 have been extensively studied through stability analyses in the literature. However, the low-frequency coherent structures inside the bubble, which have been observed in experiments, w...
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| Veröffentlicht in: | AIAA journal 2018-05, Vol.56 (5), p.1812-1817 |
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| creator | Paterson, Oliver Wang, Bofu Mao, Xuerui |
| description | Helical structures downstream of the breakdown bubble of the Grabowski vortex profile at Reynolds numbers of Re≤500 have been extensively studied through stability analyses in the literature. However, the low-frequency coherent structures inside the bubble, which have been observed in experiments, were not predicted by the stability approach. In the present work, asymptotic stabilities of the Grabowski vortex flow at Re≤1000 are carried out to compare against previous works, and then the linear optimal inflow perturbation and the corresponding outcome are studied to unveil the dynamics inside the bubble. It is found that low-frequency inflow perturbations penetrate the bubble and are amplified to coherent structures, whereas high-frequency perturbations are convected around the border of the bubble. These linearized results agree well with previous experimental observations and are validated by direct numerical simulations. |
| doi_str_mv | 10.2514/1.J055329 |
| format | Article |
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However, the low-frequency coherent structures inside the bubble, which have been observed in experiments, were not predicted by the stability approach. In the present work, asymptotic stabilities of the Grabowski vortex flow at Re≤1000 are carried out to compare against previous works, and then the linear optimal inflow perturbation and the corresponding outcome are studied to unveil the dynamics inside the bubble. It is found that low-frequency inflow perturbations penetrate the bubble and are amplified to coherent structures, whereas high-frequency perturbations are convected around the border of the bubble. These linearized results agree well with previous experimental observations and are validated by direct numerical simulations.</description><identifier>ISSN: 0001-1452</identifier><identifier>EISSN: 1533-385X</identifier><identifier>DOI: 10.2514/1.J055329</identifier><language>eng</language><publisher>Virginia: American Institute of Aeronautics and Astronautics</publisher><subject>Breakdown ; Bubbles ; Coherence ; Computational fluid dynamics ; Computer simulation ; Direct numerical simulation ; Fluid flow ; Helical flow ; Inflow ; Linearization ; Perturbation ; Reynolds number ; Stability analysis ; Vortices</subject><ispartof>AIAA journal, 2018-05, Vol.56 (5), p.1812-1817</ispartof><rights>Copyright © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Copies of this paper may be made for personal and internal use, on condition that the copier pay the per-copy fee to the Copyright Clearance Center (CCC). All requests for copying and permission to reprint should be submitted to CCC at ; employ the ISSN (print) or (online) to initiate your request.</rights><rights>Copyright © 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. Copies of this paper may be made for personal and internal use, on condition that the copier pay the per-copy fee to the Copyright Clearance Center (CCC). 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However, the low-frequency coherent structures inside the bubble, which have been observed in experiments, were not predicted by the stability approach. In the present work, asymptotic stabilities of the Grabowski vortex flow at Re≤1000 are carried out to compare against previous works, and then the linear optimal inflow perturbation and the corresponding outcome are studied to unveil the dynamics inside the bubble. It is found that low-frequency inflow perturbations penetrate the bubble and are amplified to coherent structures, whereas high-frequency perturbations are convected around the border of the bubble. 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| source | Alma/SFX Local Collection |
| subjects | Breakdown Bubbles Coherence Computational fluid dynamics Computer simulation Direct numerical simulation Fluid flow Helical flow Inflow Linearization Perturbation Reynolds number Stability analysis Vortices |
| title | Coherent Structures in the Breakdown Bubble of a Vortex Flow |
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