DNS on multiscale-generated grid turbulence using a classical grid

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationInternational Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
PublisherTSFP-8
ISBN (Electronic)9780000000002
Publication statusPublished - 2013 Jan 1
Event8th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 - Poitiers, France
Duration: 2013 Aug 282013 Aug 30

Publication series

NameInternational Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013
Volume3

Other

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

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes

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  • Cite this

    Suzuki, H., Nagata, K., Sakai, Y., Hayase, T., Hasegawa, Y., & Ushijima, T. (2013). DNS on multiscale-generated grid turbulence using a classical grid. In International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013 (International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2013; Vol. 3). TSFP-8.