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DTSTART;TZID=America/Los_Angeles:20190222T121000
DTEND;TZID=America/Los_Angeles:20190222T130000
DTSTAMP:20260611T214307
CREATED:20190221T011101Z
LAST-MODIFIED:20190221T011101Z
UID:64248-1550837400-1550840400@tricities.wsu.edu
SUMMARY:MME Seminar Series - Vortex-Breakdown and Wall-Separation States in Swirling Flows in Finite-Length Pipes
DESCRIPTION:Abstract\nThe dynamics of inviscid-limit\, incompressible and axisymmetric swirling flows in finite-length\, long circular pipes\nwith varying geometries is studied through global analysis techniques and numerical simulations. The inlet flow is\ndescribed by fixed-in-time profiles of the circumferential and axial velocity together with a fixed azimuthal vorticity\,\nwhile the outlet flow is characterized by a state with zero radial velocity. A numerical algorithm based on the upwind\nfinite-difference method for the evolution of the circulation and azimuthal vorticity together with a Poisson solver for\nthe solution of the stream function in terms of the azimuthal vorticity is developed. The convergence of computed\nresults with mesh refinement is demonstrated. Moreover\, a mathematical analysis that is based on the Squire-Long\nequation (SLE) is formulated to identify steady-state solutions of the problem with special conditions to describe\nstates with separation zones. These solutions include the base columnar flow state\, a decelerated flow along the\ncenterline\, an accelerated flow along the centerline\, a vortex-breakdown state and a wall-separation state. The\nproblem is then reduced to the columnar (axially independent) SLE\, with centerline and wall conditions for the\nsolution of the outlet flow stream function. The numerical simulations realize the various flow states and show\ncorrelation between time-asymptotic states and steady states predicted according to the SLE and the columnar\nSLE problems. The simulations also shed light on the stability of the various steady states. Results show that pipe\ndivergence promotes the appearance of breakdown states at lower inlet swirl levels while pipe contraction delays\nthe appearance of vortex breakdown to higher swirl levels and promotes formation of wall-separation states. The\ninfluence of various inlet swirling flow profiles on the manifold of steady states in a straight\, finite-length pipe and\non flow dynamics is also investigated. Depending on the inlet profiles\, flows may first exhibit vortex breakdown while\nothers wall-separation states. \nMME Seminar_Flyer_Zhang_02.22.2019
URL:/event/mme-seminar-series-vortex-breakdown-and-wall-separation-states-in-swirling-flows-in-finite-length-pipes/
LOCATION:BSEL 102
CATEGORIES:academic,Calendar,Event,student,university
ORGANIZER;CN="Changki Mo":MAILTO:changki.mo@wsu.edu
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