Measurement of turbulent energy budget of the two-dimensional mixing layer (1st report, evaluation of the dissipation rate assuming local isotropy)

Yoshiyuki Hasegawa, Shinnosuke Obi, Shigeaki Masuda

研究成果: Article査読

1 被引用数 (Scopus)

抄録

Measurement of the turbulent velocity field have been performed in a newly designed low-speed two-dimensional mixing layer facility. Mean and fluctuating velocity in the streamwise direction are measured by an I-type hot-wire anemometer, and the dissipation rate is evaluated from the time derivative of the fluctuating velocity signal based on the Taylor hypothesis and under the assumption of local isotropy of turbulence. The moments of velocity fluctuation up to the third order agree well with previous experiments and DNS, when normalized by the local turbulence velocity scale; the region of self-similarity in terms of the relative turbulence structure is found to be larger than the conventional definition of the global self similarity region where the turbulence velocity scale no longer varies in the streamwise direction. The dissipation rate can also be well correlated with the recent DNS result, when the Taylor micro length scale and local turbulence velocity scale are chosen as the characteristic length and velocity scales, respectively.

本文言語English
ページ(範囲)2187-2193
ページ数7
ジャーナルNippon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
62
598
DOI
出版ステータスPublished - 1996
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学
  • 機械工学

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