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Subgrid-scale contributions to Lagrangian time correlations in isotropic turbulence

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Abstract

The application of large-eddy simulation (LES) to particle-laden turbulence raises such a fundamental question as whether the LES with a subgrid scale (SGS) model can correctly predict Lagrangian time correlations (LTCs). Most of the currently existing SGS models are constructed based on the energy budget equations. Therefore, they are able to correctly predict energy spectra, but they may not ensure the correct prediction on the LTCs. Previous researches investigated the effect of the SGS modeling on the Eulerian time correlations. This paper is devoted to study the LTCs in LES. A direct numerical simulation (DNS) and the LES with a spectral eddy viscosity model are performed for isotropic turbulence and the LTCs are calculated using the passive vector method. Both a priori and a posteriori tests are carried out. It is observed that the subgrid-scale contributions to the LTCs cannot be simply ignored and the LES overpredicts the LTCs than the DNS. It is concluded from the straining hypothesis that an accurate prediction of enstrophy spectra is most critical to the prediction of the LTCs.

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Authors and Affiliations

  1. LNM, Institute of Mechanics, Chinese Academy of Sciences, 100190, Beijing, China

    Jian Zhang & Guowei He

  2. National Key Laboratory for Aircraft Engines, Beihang University, 100191, Beijing, China

    Jian Zhang & Lipeng Lu

Authors
  1. Jian Zhang
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  2. Guowei He
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  3. Lipeng Lu
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Correspondence to Guowei He.

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Zhang, J., He, G. & Lu, L. Subgrid-scale contributions to Lagrangian time correlations in isotropic turbulence. Acta Mech Sin 25, 45–49 (2009). https://doi.org/10.1007/s10409-008-0220-8

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  • DOI: https://doi.org/10.1007/s10409-008-0220-8

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