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    Large Eddy Simulation of Separated Flows on Unconventionally Coarse Grids1

    Source: Journal of Fluids Engineering:;2024:;volume( 146 ):;issue: 009::page 91501-1
    Author:
    Bin, Yuanwei
    ,
    Park, George I.
    ,
    Lv, Yu
    ,
    Yang, Xiang I. A.
    DOI: 10.1115/1.4064851
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: We examine and benchmark the emerging idea of applying the large eddy simulation (LES) formalism to unconventionally coarse grids where Reynolds-averaged Navier–Stokes (RANS) would be considered more appropriate at first glance. We distinguish this idea from very large eddy simulation and detached eddy simulation, which require switching between RANS and LES formalism. LES on RANS grid is appealing because first, it requires minimal changes to a production code; second, it is more cost-effective than LES; third, it converges to LES; and most importantly, it accurately predicts flows with separation. This work quantifies the benefit of LES on RANS-like grids as compared to RANS on the same grids. Three canonical cases are considered: periodic hill, backward-facing step, and jet in cross flow. We conduct direct numerical simulation (DNS), proper LES on LES grids, LES on RANS-quality grids, and RANS. We show that while the LES solutions on the RANS-quality grids are not grid converged, they are twice as accurate as the RANS on the same grids.
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      Large Eddy Simulation of Separated Flows on Unconventionally Coarse Grids1

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4295155
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    contributor authorBin, Yuanwei
    contributor authorPark, George I.
    contributor authorLv, Yu
    contributor authorYang, Xiang I. A.
    date accessioned2024-04-24T22:24:17Z
    date available2024-04-24T22:24:17Z
    date copyright3/26/2024 12:00:00 AM
    date issued2024
    identifier issn0098-2202
    identifier otherfe_146_09_091501.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4295155
    description abstractWe examine and benchmark the emerging idea of applying the large eddy simulation (LES) formalism to unconventionally coarse grids where Reynolds-averaged Navier–Stokes (RANS) would be considered more appropriate at first glance. We distinguish this idea from very large eddy simulation and detached eddy simulation, which require switching between RANS and LES formalism. LES on RANS grid is appealing because first, it requires minimal changes to a production code; second, it is more cost-effective than LES; third, it converges to LES; and most importantly, it accurately predicts flows with separation. This work quantifies the benefit of LES on RANS-like grids as compared to RANS on the same grids. Three canonical cases are considered: periodic hill, backward-facing step, and jet in cross flow. We conduct direct numerical simulation (DNS), proper LES on LES grids, LES on RANS-quality grids, and RANS. We show that while the LES solutions on the RANS-quality grids are not grid converged, they are twice as accurate as the RANS on the same grids.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleLarge Eddy Simulation of Separated Flows on Unconventionally Coarse Grids1
    typeJournal Paper
    journal volume146
    journal issue9
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4064851
    journal fristpage91501-1
    journal lastpage91501-13
    page13
    treeJournal of Fluids Engineering:;2024:;volume( 146 ):;issue: 009
    contenttypeFulltext
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