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dc.contributor.authorMellado González, Juan Pedro
dc.contributor.authorFriedrich, Rainer
dc.contributor.authorSarkar, Sutanu
dc.contributor.otherUniversitat Politècnica de Catalunya. Departament de Física
dc.identifier.citationMellado, J. P.; Friedrich, R.; Sarkar, S. Modeling of filtered heat release for large eddy simulation of compressible infinitely fast reacting flows. "Proceedings of the Combustion Institute", 1 Gener 2007, vol. 31, p. 1691-1699.
dc.description.abstractA priori and a posteriori studies for large eddy simulation of the compressible turbulent infinitely fast reacting shear layer are presented. The filtered heat release appearing in the energy equation is unclosed and the accuracy of different models for the filtered scalar dissipation rate and the conditional filtered scalar dissipation rate of the mixture fraction in closing this term is analyzed. The effect of different closures of the subgrid transport of momentum, energy and scalars on the modeling of the filtered heat release via the resolved fields is also considered. Three explicit models of these subgrid fluxes are explored, each with an increasing level of reconstruction and all of them regularized by a Smagorinsky-type term. It is observed that a major part of the error in the prediction of the conditional filtered scalar dissipation comes from the unsatisfactory modeling of the filtered dissipation itself. The error can be substantial in the turbulent fluctuation (rms) of the dissipation fields. It is encouraging that all models give good predictions of the mean and rms density in a posteriori LES of this flow with realistic heat release corresponding to large density change. Although a posteriori results show a small sensitivity to subgrid modeling errors in the current problem, extinction–reignition phenomena involving finite-rate chemistry would demand more accurate modeling of the dissipation rates. A posteriori results also show that the resolved fields obtained with the approximate reconstruction using moments (ARM) agree better with the filtered direct numerical simulation since the level of reconstruction in the modeled subfilter fluxes is increased.
dc.format.extent9 p.
dc.subjectÀrees temàtiques de la UPC::Física
dc.subject.lcshEddies--Simulation methods
dc.subject.lcshFluid dynamics
dc.subject.otherLarge eddy simulation
dc.subject.otherInfinitely fast
dc.titleModeling of filtered heat release for large eddy simulation of compressible infinitely fast reacting flows
dc.subject.lemacDinàmica de fluids
dc.description.peerreviewedPeer Reviewed
dc.rights.accessRestricted access - publisher's policy
dc.description.versionPostprint (published version)
local.citation.authorMellado, J. P.; Friedrich, R.; Sarkar, S.
local.citation.publicationNameProceedings of the Combustion Institute

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