Three-dimensional flow in circular cavities of large spanwise aspect ratio
Experimental data are presented for the vortex flow in a nominally two-dimensional circular cavity. The vortex is driven by a separated shear layer along an open section of the cavity circumference. It is shown that the core vortex flow is perturbed three-dimensionally. An inviscid analysis of an id...
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| Veröffentlicht in: | Journal of fluid mechanics 2012-09, Vol.707, p.551-574 |
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| container_title | Journal of fluid mechanics |
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| creator | Tutty, Owen Savelsberg, Ralph Castro, Ian P. |
| description | Experimental data are presented for the vortex flow in a nominally two-dimensional circular cavity. The vortex is driven by a separated shear layer along an open section of the cavity circumference. It is shown that the core vortex flow is perturbed three-dimensionally. An inviscid analysis of an ideal core (solid body) vortex is given and it is shown that this flow contains a steady perturbation whose characteristics are almost exactly those identified in the experiments. Viscous effects reduce (by a few per cent) the spanwise wavelength of the perturbation and also lead, via spatial variations in Reynolds stress, to a modification of the core flow so that the radial profile of the circumferential velocity is ‘S’-shaped, rather than linear. |
| doi_str_mv | 10.1017/jfm.2012.301 |
| format | Article |
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The vortex is driven by a separated shear layer along an open section of the cavity circumference. It is shown that the core vortex flow is perturbed three-dimensionally. An inviscid analysis of an ideal core (solid body) vortex is given and it is shown that this flow contains a steady perturbation whose characteristics are almost exactly those identified in the experiments. 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Fluid Mech</addtitle><date>2012-09-25</date><risdate>2012</risdate><volume>707</volume><spage>551</spage><epage>574</epage><pages>551-574</pages><issn>0022-1120</issn><eissn>1469-7645</eissn><coden>JFLSA7</coden><abstract>Experimental data are presented for the vortex flow in a nominally two-dimensional circular cavity. The vortex is driven by a separated shear layer along an open section of the cavity circumference. It is shown that the core vortex flow is perturbed three-dimensionally. An inviscid analysis of an ideal core (solid body) vortex is given and it is shown that this flow contains a steady perturbation whose characteristics are almost exactly those identified in the experiments. Viscous effects reduce (by a few per cent) the spanwise wavelength of the perturbation and also lead, via spatial variations in Reynolds stress, to a modification of the core flow so that the radial profile of the circumferential velocity is ‘S’-shaped, rather than linear.</abstract><cop>Cambridge, UK</cop><pub>Cambridge University Press</pub><doi>10.1017/jfm.2012.301</doi><tpages>24</tpages></addata></record> |
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| ispartof | Journal of fluid mechanics, 2012-09, Vol.707, p.551-574 |
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| source | Cambridge University Press Journals Complete |
| subjects | Circularity Circumferences Exact sciences and technology Fluid dynamics Fluid flow Fluid mechanics Fundamental areas of phenomenology (including applications) Holes Instrumentation for fluid dynamics Laminar flows Laminar flows in cavities Perturbation methods Physics Reynolds number Rotational flow and vorticity Shear layers Velocity Vortex dynamics Vortices |
| title | Three-dimensional flow in circular cavities of large spanwise aspect ratio |
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