Large eddy simulations (LES) have been carried out for confined swirling coaxial jets discharged into a suddenly expanded pipe, which was studied experimentally by Roback and Johnson [1, 2]. The computations were made using a parallelized finite-volume-based Navier-Stokes solver that is second-order accurate in time and space, and permits use of unstructured meshes. The computational domain starts from an inlet placed upstream of the swirl generator, which makes the inlet boundary condition easy to specify. Subgrid-scale turbulent stresses were modeled using a dynamic Smagorinsky model applicable to complex three-dimensional flows without any statistically homogeneous directions. Subgrid-scale turbulent scalar flux is modeled using a constant Schmidt number in conjunction with the dynamically computed subgrid-scale turbulent viscosity. The LES predictions were found to closely reproduce the salient features of the flow and the species concentration downstream of the expansion. One of the conclusions was that a good resolution of the mean flow and turbulence in the upstream region is crucial in accurately predicting the mixing downstream of the expansion.
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ASME 2005 Fluids Engineering Division Summer Meeting
June 19–23, 2005
Houston, Texas, USA
Conference Sponsors:
- Fluids Engineering Division
ISBN:
0-7918-4198-7
PROCEEDINGS PAPER
Large Eddy Simulation of Confined Swirling Coaxial Jets Available to Purchase
Stefano Orsino
Stefano Orsino
Fluent, Inc., Lebanon, NH
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Sung-Eun Kim
Fluent, Inc., Lebanon, NH
Xuelei Zhu
Fluent, Inc., Lebanon, NH
Stefano Orsino
Fluent, Inc., Lebanon, NH
Paper No:
FEDSM2005-77085, pp. 307-316; 10 pages
Published Online:
October 13, 2008
Citation
Kim, S, Zhu, X, & Orsino, S. "Large Eddy Simulation of Confined Swirling Coaxial Jets." Proceedings of the ASME 2005 Fluids Engineering Division Summer Meeting. Volume 1: Symposia, Parts A and B. Houston, Texas, USA. June 19–23, 2005. pp. 307-316. ASME. https://doi.org/10.1115/FEDSM2005-77085
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