Accuracy of Large-Eddy Simulation of Premixed Turbulent Combustion

  • A. W. Vreman
  • R. J. M. Bastiaans
  • B. J. Geurts
Part of the Ercoftac Series book series (ERCO, volume 12)


The accuracy of large-eddy simulation (LES) of a turbulent premixed Bunsen flame is investigated in this paper. To distinguish between discretization and modeling errors, multiple large-eddy simulations, using different grid size h but the same filterwidth Δ, are compared with the direct numerical simulation (DNS). In addition, large-eddy simulations using multiple Δ but the same ratio Δ/h are compared. The chemistry in the LES and DNS is parametrized with the standard steady premixed flamelet for stochiometric methane-air combustion. The subgrid terms are closed with an eddy-viscosity or eddy-diffusivity approach, with an exception of the dominant subgrid term, which is the subgrid part of the chemical source term. The latter subgrid contribution is modeled by a similarity model based upon Δ, which is found to be superior to such a model based upon Δ. Using the 2Δ similarity model for the subgrid chemistry the LES produces good results, certainly in view of the fact that the LES is completely wrong if the subgrid chemistry model is omitted. The grid refinements of the LES show that the results for Δ = h do depend on the numerical scheme, much more than for h = Δ/2 and h = Δ/4. Nevertheless, modeling errors and discretization error may partially cancel each other; occasionally the Δ = h results were more accurate than the h ≤ Δ results.


Large-eddy simulation Accuracy tests Turbulent combustion Premixed flamelets 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2008

Authors and Affiliations

  • A. W. Vreman
    • 1
    • 2
  • R. J. M. Bastiaans
    • 1
  • B. J. Geurts
    • 3
    • 4
  1. 1.Combustion Technology Department of Mechanical EngineeringEindhoven University of Technology5600 MB Eindhoven
  2. 2.Vreman Research7552 NT Hengelo
  3. 3.Mathematical SciencesUniversity of Twente7500 AE Enschede
  4. 4.Applied Physics Eindhoven University of Technology5600 MB

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