Abstract
In the present study, the stability of a helical vortex triplet has been predicted theoretically for the first time, and its existence proven experimentally as well as numerically. As basic flow configuration, swirling flows induced by a rotating cover in a closed cylinder have been considered. The experimental investigation was carried using simultaneously two diagnostics methods: Particle Image Velocimetry (PIV) to determine velocity fields by particle tracks and Laser Doppler Anemometry (LDA) to establish time-histories. The flow was systematically investigated for flow structures and, as a result, the existence of a stable vortex triplet was found at operating conditions corresponding to those predicted by the theoretical stability analysis. For the same flow regime, the 3D unsteady Navier-Stokes equations were solved numerically to identify the 3D structure of the vortex triplet.
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© 2008 Springer Science + Business Media B.V
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Okulov, V.L., Naumov, I.V., Shen, W.Z., Sørensen, J.N. (2008). Triplet of Helical Vortices. In: Borisov, A.V., Kozlov, V.V., Mamaev, I.S., Sokolovskiy, M.A. (eds) IUTAM Symposium on Hamiltonian Dynamics, Vortex Structures, Turbulence. IUTAM Bookseries, vol 6. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6744-0_24
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DOI: https://doi.org/10.1007/978-1-4020-6744-0_24
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-6743-3
Online ISBN: 978-1-4020-6744-0
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