Sidewall boundary layer instabilities in confined swirling flow †
نویسنده
چکیده
We examine enclosed swirling transitional and turbulent flows in a cylindrical vessel, driven by a single rotating endwall. The cylinder height:radius ratio H/R = 1 was chosen explicitly to preclude the possibility of vortex breakdown on the cylinder axis, thus concentrating attention on the behaviour of the cylindrical sidewall boundary layers. Over a range of Reynolds numbers above Re = ΩR2/ν = 1× 104, sidewall boundary layer instabilities evolve to form nearwall vortex structures that are aligned with the wall traction field. The number of structures increases with Reynolds number, and the characteristic length scale drops. A DNS study with matching LDV validation confirms the presence of near-wall vortex structures, which precess slowly around the container. PACS numbers: 47.27.Nz, 47.15.Rq, 47.32.Cc. † This article was chosen from selected Proceedings of the Eighth European Turbulence Conference (Advances in Turbulence VIII (Barcelona, 27–30 June 2000) (Barcelona: CIMNE) ed C Dopazo. ISBN: 84-89925-65-8). c ©2001 IOP Publishing Ltd PII: S1468-5248(01)22929-4 1468-5248/01/000001+14$30.00 oT 2 (201) 09 Sidewall boundary layer instabilities in confined swirling flow
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