Role of various scale-similarity models in stabilized mixed subgrid-scale model

Kazuhiro Inagaki, Hiromichi Kobayashi

研究成果: Article査読

4 被引用数 (Scopus)

抄録

We investigate the physical role of various scale-similarity models in the stabilized mixed model [K. Abe, "An improved anisotropy-resolving subgrid-scale model with the aid of a scale-similarity modeling concept,"Int. J. Heat Fluid Flow 39, 42 (2013); M. Inagaki and K. Abe, "An improved anisotropy-resolving subgrid-scale model for flows in laminar-turbulent transition region,"Int. J. Heat Fluid Flow 64, 137 (2017)] and evaluate their performance in turbulent channel flows. Among various models in the present study, the original model combined with the scale-similarity model for the subgrid-scale (SGS)-Reynolds term yields the best prediction for the anisotropy of the grid-scale (GS) velocity fluctuations and the SGS stress, even in coarse grid resolutions. Moreover, it successfully predicts large intensities of the spectra close to the cut-off scale in accordance with the filtered direct numerical simulation, whereas other models predict a rapid decay of the spectra in the low-wavelength region. To investigate the behavior of the models close to the cut-off scale, we analyze the budget equation for the GS Reynolds stress spectrum. The result shows that the scale-similarity model for the SGS-Reynolds term plays a role in the enhancement of the wall-normal velocity fluctuation close to the cut-off scale. Thereby, it activates turbulence close to the cut-off scale, leading to a reproduction of the proper streak structures observed in wall-bounded turbulent flows. The reproduction of velocity fluctuations close to the cut-off scale and turbulent structures is a key element for further development of SGS models.

本文言語English
論文番号075108
ジャーナルPhysics of Fluids
32
7
DOI
出版ステータスPublished - 2020 7 1

ASJC Scopus subject areas

  • 計算力学
  • 凝縮系物理学
  • 材料力学
  • 機械工学
  • 流体および伝熱

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