Third M.I.T. Conference on Computational Fluid and Solid Mechanics June 14–17, 2005  

T-RANS based analysis of turbulent swirling flows

A.C. Benima,*, A. Nahavandia, K.J. Syedb
aDepartment of Mechanical and Process Engineering, Duesseldorf University of Applied Sciences, Josef-Gockeln-Strasse 9, D-40474 Duesseldorf, Germany  bSiemens Industrial Turbomachinery Ltd, Lincoln LN5 7FD, UK

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Confined incompressible turbulent swirling flows exhibiting vortex breakdown have been computationally investigated. Transient Reynolds averaged numerical simulations (T-RANS) have been performed employing a differential Reynolds stress model (RSM) to address turbulence. It has been shown that much better agreement with experimental data can be achieved utilizing this approach in comparison to a steady-state procedure. This reveals the importance of the coherent transient motion in combination with the non-isotropic turbulence structure in swirling flows. The predictability of the vortex core transition and the influence of downstream conditions on the upstream flow, depending on whether the flow is sub- or super-critical, has also been investigated.

Keywords:  Turbulent swirling flows; Turbulence modelling; T-RANS; RSM; CFD

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