Predictive capability of Large Eddy Simulation for point-wise and spatial turbulence statistics in a confined rectangular jet

B. Kong, M. G. Olsen*, R. O. Fox, J. C. Hill

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Large Eddy Simulations (LESs) were performed for a confined rectangular liquid jet with a co-flow and compared in detail with particle image velocimetry (PIV) measurements. A finite-volume CFD library, OpenFOAM, was used to discretize and solve the filtered Navier-Stokes equation. The effects of grid resolution, numerical schemes and subgrid models on the LES results were investigated. The second and fourth order schemes gave similar performance, while the fourth order scheme costs much more computationally. Subgrid model comparison showed that the locally dynamic procedure is necessary for complex flow simulation. Model validation was performed by comparing LES data for the point-wise velocity statistics such as the mean and the root-mean-square velocity, shear stress, correlation coefficient, velocity skewness and flatness with the PIV data. In addition, LES data for the two-point spatial correlations of velocity fluctuations that provide structural information were computed and compared with PIV data. Good agreement was observed leading to the conclusion that the LES velocity field accurately captures the important characteristics of all the turbulent length scales present in the flow, from the fully resolved energy-containing eddies to the subgrid-scale dissipative eddies.

Original languageEnglish
Pages (from-to)240-256
Number of pages17
JournalChemical Engineering Science
Volume69
Issue number1
DOIs
StatePublished - 13 Feb 2012
Externally publishedYes

Keywords

  • Chemical reactors
  • Computation
  • Fluid mechanics
  • Mixing
  • Simulation
  • Turbulence

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