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    Comparison of DDES and URANS for Unsteady Tip Leakage Flow in an Axial Compressor Rotor

    Source: Journal of Fluids Engineering:;2019:;volume( 141 ):;issue: 012::page 121405
    Author:
    Liu, Yangwei
    ,
    Zhong, Luyang
    ,
    Lu, Lipeng
    DOI: 10.1115/1.4043774
    Publisher: American Society of Mechanical Engineers (ASME)
    Abstract: Tip leakage vortex (TLV) has a large impact on compressor performance and should be accurately predicted by computational fluid dynamics (CFD) methods. New approaches of turbulence modeling, such as delayed detached eddy simulation (DDES), have been proposed, the computational resources of which can be reduced much more than for large eddy simulation (LES). In this paper, the numerical simulations of the rotor in a low-speed large-scale axial compressor based on DDES and unsteady Reynolds-averaged Navier–Stokes (URANS) are performed, thus improving our understanding of the TLV dynamic mechanisms and discrepancy of these two methods. We compared the influence of different time steps in the URANS simulation. The widely used large time-step makes the unsteadiness extremely weak. The small time-step shows a better result close to DDES. The time-step scale is related to the URANS unsteadiness and should be carefully selected. In the time-averaged flow, the TLV in DDES dissipates faster, which has a more similar structure to the experiment. Then, the time-averaged and instantaneous results are compared to divide the TLV into three parts. URANS cannot give the loss of stability and evolution details of TLV. The fluctuation velocity spectra show that the amplitude of high frequencies becomes obvious downstream from the TLV, where it becomes unstable. Last, the anisotropy of the Reynolds stress of these two methods is analyzed through the Lumley triangle to see the distinction between the methods and obtain the Reynolds stress. The results indicate that the TLV latter part in DDES is anisotropic, while in URANS it is isotropic.
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      Comparison of DDES and URANS for Unsteady Tip Leakage Flow in an Axial Compressor Rotor

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    contributor authorLiu, Yangwei
    contributor authorZhong, Luyang
    contributor authorLu, Lipeng
    date accessioned2019-09-18T09:02:01Z
    date available2019-09-18T09:02:01Z
    date copyright6/17/2019 12:00:00 AM
    date issued2019
    identifier issn0098-2202
    identifier otherfe_141_12_121405
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4258073
    description abstractTip leakage vortex (TLV) has a large impact on compressor performance and should be accurately predicted by computational fluid dynamics (CFD) methods. New approaches of turbulence modeling, such as delayed detached eddy simulation (DDES), have been proposed, the computational resources of which can be reduced much more than for large eddy simulation (LES). In this paper, the numerical simulations of the rotor in a low-speed large-scale axial compressor based on DDES and unsteady Reynolds-averaged Navier–Stokes (URANS) are performed, thus improving our understanding of the TLV dynamic mechanisms and discrepancy of these two methods. We compared the influence of different time steps in the URANS simulation. The widely used large time-step makes the unsteadiness extremely weak. The small time-step shows a better result close to DDES. The time-step scale is related to the URANS unsteadiness and should be carefully selected. In the time-averaged flow, the TLV in DDES dissipates faster, which has a more similar structure to the experiment. Then, the time-averaged and instantaneous results are compared to divide the TLV into three parts. URANS cannot give the loss of stability and evolution details of TLV. The fluctuation velocity spectra show that the amplitude of high frequencies becomes obvious downstream from the TLV, where it becomes unstable. Last, the anisotropy of the Reynolds stress of these two methods is analyzed through the Lumley triangle to see the distinction between the methods and obtain the Reynolds stress. The results indicate that the TLV latter part in DDES is anisotropic, while in URANS it is isotropic.
    publisherAmerican Society of Mechanical Engineers (ASME)
    titleComparison of DDES and URANS for Unsteady Tip Leakage Flow in an Axial Compressor Rotor
    typeJournal Paper
    journal volume141
    journal issue12
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4043774
    journal fristpage121405
    journal lastpage121405-13
    treeJournal of Fluids Engineering:;2019:;volume( 141 ):;issue: 012
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
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