DNS on multiscale-generated grid turbulence using a classical grid

Hiroki Suzuki, Kouji Nagata, Yasuhiko Sakai, Toshiyuki Hayase, Yutaka Hasegawa, Tatsuo Ushijima

研究成果: Conference contribution

抄録

We carry out direct numerical simulation of experimental grid turbulence, for which the mesh Reynolds number is 2500. The grid is directly constructed in the computational domain. The streamwise computational domain size is >100 times the mesh size. The value of the decay exponent n is estimated as n ≈ 1.36 by using a ratio defined by the turbulent kinetic energy and its dissipation. The prevailing perspective is that the memory of the turbulence cannot be considered as short. In this paper, we propose a promoter that focuses on the generation of turbulence using the grid, not on the shape of the grid, as addressed in previous studies (Hurst & Vassilicos (2007); Krogstad & Davidson (2011)), from a multiscale perspective and investigate the effects of the turbulence-generating method on the decay exponent n. Specifically, n is increased to n ≈ 1.53 and 1.41 because of the changes in the initial conditions.

本文言語English
ホスト出版物のタイトルInternational Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
出版社TSFP-8
ISBN(電子版)9780000000002
出版ステータスPublished - 2013
イベント8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 - Poitiers, France
継続期間: 2013 8月 282013 8月 30

出版物シリーズ

名前International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
3

Other

Other8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
国/地域France
CityPoitiers
Period13/8/2813/8/30

ASJC Scopus subject areas

  • 流体および伝熱

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