A Wall Effects and Means of Controlling the Evolution of Swirling Flows with Vortex Breakdown
This paper investigates numerically the bubble-type vortex breakdown apparition in the case of closed rotating flows of a viscous, axisymmetric, and incompressible fluid. First, a truncated conical/cylindrical cavity of spherical end disks is used to simulate and analyze the vortex structure under r...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Isfahan University of Technology
2023-09-01
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| Series: | Journal of Applied Fluid Mechanics |
| Subjects: | |
| Online Access: | https://www.jafmonline.net/article_2302_31054c5296c22ef06607dfcfd5a828bb.pdf |
| _version_ | 1797693829625675776 |
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| author | A. Meziane M. Hachemi M. Kessal M. Imoula |
| author_facet | A. Meziane M. Hachemi M. Kessal M. Imoula |
| author_sort | A. Meziane |
| collection | DOAJ |
| description | This paper investigates numerically the bubble-type vortex breakdown apparition in the case of closed rotating flows of a viscous, axisymmetric, and incompressible fluid. First, a truncated conical/cylindrical cavity of spherical end disks is used to simulate and analyze the vortex structure under rigid surface conditions. The geometric effects of the enclosure are also studied. Vortex breakdown is demonstrated beyond the lower disk rotation rate threshold by introducing the no-slip condition imposed on the upper wall. The objective is to explore ways of controlling the evolution of this physical event by modifying the confinement conditions upstream of the vortex rupture. Particular attention is also paid to the effective kinematic viscosity, thermal diffusivity and geometric control of recirculation zones on the axis of rotation (axial bubble type). The second geometry consists of a spherical annulus formed by two concentric hemispheres in differential rotation under plat-free surface conditions. The results show that rotation of the inner hemisphere induces a vortex bubble on the polar axis. In contrast, the outer hemisphere rotation induces a toroidal vortex on the equator. |
| first_indexed | 2024-03-12T02:49:16Z |
| format | Article |
| id | doaj.art-73f1bd904a3a448fbe81ec346a2ff358 |
| institution | Directory Open Access Journal |
| issn | 1735-3572 1735-3645 |
| language | English |
| last_indexed | 2024-03-12T02:49:16Z |
| publishDate | 2023-09-01 |
| publisher | Isfahan University of Technology |
| record_format | Article |
| series | Journal of Applied Fluid Mechanics |
| spelling | doaj.art-73f1bd904a3a448fbe81ec346a2ff3582023-09-04T05:52:07ZengIsfahan University of TechnologyJournal of Applied Fluid Mechanics1735-35721735-36452023-09-0116112277228910.47176/jafm.16.11.17672302A Wall Effects and Means of Controlling the Evolution of Swirling Flows with Vortex BreakdownA. Meziane0M. Hachemi1M. Kessal2M. Imoula3Dynamique des Moteurs et Vibroacoustique Laboratory, M’Hamed Bougara Boumerdes University, AlgeriaEnergétique, Mécanique et Ingénieries Laboratory, M’Hamed Bougara Boumerdes University, AlgeriaGéniePhysique des Hydrocarbures Laboratory, M’Hamed Bougara Boumerdes University, AlgeriaDynamique des Moteurs et Vibroacoustique Laboratory, M’Hamed Bougara Boumerdes University, AlgeriaThis paper investigates numerically the bubble-type vortex breakdown apparition in the case of closed rotating flows of a viscous, axisymmetric, and incompressible fluid. First, a truncated conical/cylindrical cavity of spherical end disks is used to simulate and analyze the vortex structure under rigid surface conditions. The geometric effects of the enclosure are also studied. Vortex breakdown is demonstrated beyond the lower disk rotation rate threshold by introducing the no-slip condition imposed on the upper wall. The objective is to explore ways of controlling the evolution of this physical event by modifying the confinement conditions upstream of the vortex rupture. Particular attention is also paid to the effective kinematic viscosity, thermal diffusivity and geometric control of recirculation zones on the axis of rotation (axial bubble type). The second geometry consists of a spherical annulus formed by two concentric hemispheres in differential rotation under plat-free surface conditions. The results show that rotation of the inner hemisphere induces a vortex bubble on the polar axis. In contrast, the outer hemisphere rotation induces a toroidal vortex on the equator.https://www.jafmonline.net/article_2302_31054c5296c22ef06607dfcfd5a828bb.pdfvortex breakdownspherical gap spacesmeans of controlrotating diskskinematical controlboundary effects |
| spellingShingle | A. Meziane M. Hachemi M. Kessal M. Imoula A Wall Effects and Means of Controlling the Evolution of Swirling Flows with Vortex Breakdown Journal of Applied Fluid Mechanics vortex breakdown spherical gap spaces means of control rotating disks kinematical control boundary effects |
| title | A Wall Effects and Means of Controlling the Evolution of Swirling Flows with Vortex Breakdown |
| title_full | A Wall Effects and Means of Controlling the Evolution of Swirling Flows with Vortex Breakdown |
| title_fullStr | A Wall Effects and Means of Controlling the Evolution of Swirling Flows with Vortex Breakdown |
| title_full_unstemmed | A Wall Effects and Means of Controlling the Evolution of Swirling Flows with Vortex Breakdown |
| title_short | A Wall Effects and Means of Controlling the Evolution of Swirling Flows with Vortex Breakdown |
| title_sort | wall effects and means of controlling the evolution of swirling flows with vortex breakdown |
| topic | vortex breakdown spherical gap spaces means of control rotating disks kinematical control boundary effects |
| url | https://www.jafmonline.net/article_2302_31054c5296c22ef06607dfcfd5a828bb.pdf |
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