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Large Eddy Simulations of Swirling Nozzle‐Jet Flow Undergoing Vortex Breakdown
Author(s) -
Luginsland T.,
Kleiser L.
Publication year - 2011
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201110278
Subject(s) - stagnation point , mechanics , jet (fluid) , vortex , nozzle , mach number , physics , large eddy simulation , inflow , compressible flow , stagnation pressure , flow (mathematics) , stagnation temperature , classical mechanics , compressibility , turbulence , heat transfer , thermodynamics
We developed a numerical setup to simulate swirling jet flow undergoing vortex breakdown. Our simulation code CONCYL solves the compressible Navier‐Stokes equations in cylindrical coordinates using high‐order numerical schemes. A nozzle is included in the computational domain to account for more realistic inflow boundary conditions. Preliminary results of a Re = 5000 compressible swirling jet at Mach number M a = 0.6 with an azimuthal velocity as high as the maximum axial velocity (swirl number S = 1.0 ) capture the fundamental characteristics of this flow type: At a certain point in time the jet spreads and develops into a conical vortex breakdown. A stagnation point‐flow in the vicinity of the jet axis is clearly visible with the stagnation point located close to the nozzle exit. The stagnation point precesses in time around the jet axis, moving up‐ and downstream. (© 2011 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)