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Intertwining Laminar Necklace Vortices C. V. Seal and C. R. Smith Citation: Physics of Fluids 9, S9 (1997); doi: 10.1063/1.4739138 View online: http://dx.doi.org/10.1063/1.4739138 View Table of Contents: http://scitation.aip.org/content/aip/journal/pof2/9/9?ver=pdfcov Published by the AIP Publishing Articles you may be interested in A numerical study of the laminar necklace vortex system and its effect on the wake for a circular cylinder Phys. Fluids 24, 073602 (2012); 10.1063/1.4731291 Vortical structures in a laminar V-notched indeterminate-origin jet Phys. Fluids 17, 054108 (2005); 10.1063/1.1904103 Point vortices with a rational necklace: New exact stationary solutions of the two-dimensional Euler equation Phys. Fluids 16, 2877 (2004); 10.1063/1.1760772 Analysis by Means of Light Scattering of Laminar, Vortical, and Turbulent Flow J. Rheol. 26, 199 (1982); 10.1122/1.549683 Light Scattering by Linear Macromolecules Oriented in Laminar Flow. III. Perfectly Flexible Necklace Model with no Hydrodynamic Interaction J. Chem. Phys. 40, 1029 (1964); 10.1063/1.1725242
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FIG. 1.
FIG. 2.
INTERTWINING LAMINAR NECKLACE VORTICES Submitted by C. V. Seal and C. R. Smith (Lehigh University)
Figure 1 is a hydrogen bubble visualization of the intertwining laminar necklace vortices formed in the junction of a cylinder and flat plate subjected to spatially limited, constant rate suction through a rectangular surface slot. Figure 2 is a schematic illustrating the vortices and their intertwinement as well as the suction slot placement. The suction slot was 64 mm32 mm and was located 88.5 mm from the cylinder,
FIG. 3.
which was 8.9 cm in diameter. For a particular combination of Reynolds numbers and suction rates, the flow is characterized by the formation of a number of steady vortices at the outboard edges of the suction slot. Downstream of the slot, an unsteady necklace ~or horseshoe! vortex periodically forms, which undergoes a three-dimensional intertwinement with a steady vortex. Figure 3 is a short time sequence illustrating the three-dimensional periodicity of the system. Selected video sequences can be viewed at http:// www.lehigh.edu/;inmem/fluids/junction/intertwine1.html.
