Accuracy of large-eddy simulation of premixed turbulent combustion

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3 Citations (Scopus)

Abstract

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 ¿, are compared with the direct numerical simulation (DNS). In addition, large-eddy simulations using multiple ¿ but the same ratio ¿/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 ¿, which is found to be superior to such a model based upon ¿. Using the 2¿ 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 ¿ = h do depend on the numerical scheme, much more than for h = ¿/2 and h = ¿/4. Nevertheless, modeling errors and discretization error may partially cancel each other; occasionally the ¿ = h results were more accurate than the h = ¿ results.
Original languageEnglish
Title of host publicationQuality and reliability of large-Eddy simulations
EditorsJ. Meyers, B.J. Geurts, P. Sagaut
Place of PublicationDordrecht
PublisherSpringer
Chapter25
Pages307-318
Number of pages12
ISBN (Electronic)978-1-4020-8578-9
ISBN (Print)978-1-4020-8577-2
DOIs
Publication statusPublished - 2008
Eventconference; QLES Meeting / Workshop on Quality and Reliability of Large-Eddy Simulation ; 1 (Leuven) : 2007.10.22-24; 2007-10-22; 2007-10-24 -
Duration: 22 Oct 200724 Oct 2007

Publication series

NameErcoftac Series (ERCO)
Volume12
ISSN (Print)1382-4309

Conference

Conferenceconference; QLES Meeting / Workshop on Quality and Reliability of Large-Eddy Simulation ; 1 (Leuven) : 2007.10.22-24; 2007-10-22; 2007-10-24
Period22/10/0724/10/07
OtherQLES Meeting / Workshop on Quality and Reliability of Large-Eddy Simulation ; 1 (Leuven) : 2007.10.22-24

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