Turbulence structure of multiscale generated turbulence by fractal grids and scalar transfer mechanism (2nd report, DNS on the influence of grid parameters on homogeneity, isotropy and intermittency)

Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase

研究成果: Article査読

抄録

Turbulence characteristics in the spatially developing fractal-generated turbulence are investigated by means of the direct numerical simulation (DNS). The square type fractal grids are numerically constructed using the immersed boundary method. The effects of solidity σ and thickness ratio t r, which are ones of the most important grid parameters for fractal grids, are investigated in detail. The results show that the increase of a leads to the improvement of the uniformity and isotropy of flow fields. The integral length scale in the decaying region of the fractal-generated turbulence remains monotone increase at high σ and tr, whereas it is approximately constant at low σ and tr. The derivative skewness and flatness in the streamwise direction are different from those in the transverse direction for all σ and tr investigated. These results will be useful for designing fractal grids for practical applications.

本文言語English
ページ(範囲)2024-2031
ページ数8
ジャーナルNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
76
772
DOI
出版ステータスPublished - 2010 12月

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学

フィンガープリント

「Turbulence structure of multiscale generated turbulence by fractal grids and scalar transfer mechanism (2nd report, DNS on the influence of grid parameters on homogeneity, isotropy and intermittency)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル