Experimental Assessment of ‘subgrid’ scale Probability Density Function Models for Large Eddy Simulation

Viacheslav Stetsyuk, Y. Hardalupas, Alex Taylor, Nikolaos Soulopoulos

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Filtered density functions (FDFs) of mixture fraction are quantified by analyzing experimental data obtained from two-dimensional planar laser-induced fluorescence scalar measurements in the isothermal swirling flow of a combustor operating at a Reynolds number of 28,662 for three different swirl numbers (0.3, 0.58 and 1.07). Two-dimensional filtering using a box filter was performed on the measured scalar to obtain the filtered variables used for presumed β -FDF and top-hat FDF for Large Eddy Simulations (LES). A dependant variable from the measured scalar, which was a pre-computed temperature, was integrated over the experimentally obtained FDF as well as over the presumed beta or top-hat FDFs and a relative error in temperature prediction was calculated. The experimentally measured FDFs depended on swirl numbers and axial and radial positions in the flow. The FDFs were unimodal in the regions of low variance and bimodal in the regions of high variance. The influence of the filter spatial dimension on the measured FDF was evaluated and consequences for Subgrid modeling for LES discussed.
Original languageEnglish
Title of host publicationProceedings - 16th International Symposium on Applications of Laser Techniques to Fluid Mechanics : from 9 to 12 of July ; Lisbon 2012
Place of PublicationLisbon
Publisher Instituto Superior Técnico
Publication statusPublished - 12 Jul 2012
Externally publishedYes
EventInternational Symposium on Applications of Laser Techniques to Fluid Mechanics - The Calouste Gulbenkian Foundation, Lisbon, Portugal
Duration: 9 Jul 201212 Jul 2012
http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2012/index.asp (Link to Conference Website)

Conference

ConferenceInternational Symposium on Applications of Laser Techniques to Fluid Mechanics
CountryPortugal
CityLisbon
Period9/07/1212/07/12
Internet address

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Stetsyuk, V., Hardalupas, Y., Taylor, A., & Soulopoulos, N. (2012). Experimental Assessment of ‘subgrid’ scale Probability Density Function Models for Large Eddy Simulation. In Proceedings - 16th International Symposium on Applications of Laser Techniques to Fluid Mechanics : from 9 to 12 of July ; Lisbon 2012 Lisbon: Instituto Superior Técnico.