Optimal unstructured meshing for large eddy simulations

Yacine Addad, Ulka Gaitonde, Dominique Laurence, Stefano Rolfo

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    65 Scopus citations


    An attempt is made to provide a criterion for optimal unstructured meshing for LES from the knowledge of different turbulence lengthscales. In particular, the performance of a grid based on the Taylor microscales for turbulent channel flow, is investigated, with the final view of facilitating an a priori determination of the mesh resolution required for LES. The grid dictated by the Taylor microscales is more cubical in the centre of the domain than the typical empirical LES grids. Furthermore, it is as fine in the spanwise direction as it is in the wall normal direction. Empirical LES grids, currently widely used, have a very fine (approximately four times finer) wall normal resolution and a coarse (about twice as course) streamwise resolution as compared to a grid based on the Taylor microscales. A remarkable feature is that the mean velocity and streamwise component of fluctuating velocity (classically over-predicted in coarse grid LES) and the wall normal fluctuating velocity are well reproduced on the new grid. The attempt of building an unstructured LES grid based on the Taylor microscale has been found very successful. However, as the Reynolds number is increased this sort of requirement might be excessive and eventualy a criterion such as one tenth of the integral lengthscale could be sufficient.

    Original languageBritish English
    Title of host publicationQuality and Reliability of Large-Eddy Simulations
    EditorsJohan Meyers, Bernard J. Geurts, Pierre Sagaut
    Number of pages11
    ISBN (Print)9781402085772
    StatePublished - 2008
    Event1st Meeting on Quality and Reliability of Large-Eddy Simulation, QLES 2007 - Leuven, Belgium
    Duration: 22 Oct 200724 Oct 2007

    Publication series

    NameERCOFTAC Series
    ISSN (Print)1382-4309
    ISSN (Electronic)2215-1826


    Conference1st Meeting on Quality and Reliability of Large-Eddy Simulation, QLES 2007


    • Grid optimization
    • Large-eddy simulation
    • Taylor microscales
    • Turbulence lengthscales


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