Investigation of impact of secondary flows in turbulent open-channel flows using DNS data

Sung Uk Choi, Younghoon Joung

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

Abstract

In the present study, DNS data of rectangular and compound open-channel flows are provided to investigate the impact of secondary flows on the flow structure. In the mean velocity field from the DNS data, strong secondary flows are observed near the specific wall region, and they appear to affect significantly the distribution of the mean streamwise velocity. For both rectangular and compound open-channel flows, it is found that the mean streamwise velocity does not satisfy the log-law in the region where the strong secondary flows are generated. Also, the wall shear stress from the present DNS data and LES data in the literature shows a peak at the free surface and at the juncture of the main channel and the floodplain for the rectangular and compound open-channel flows, respectively. However, measured data in the literature do not show the same tendency, which comes from improper estimation of the shear velocity with the experimental data.

Original languageEnglish
Title of host publication31st IAHR Congress 2005
Subtitle of host publicationWater Engineering for the Future, Choices and Challenges
EditorsJun Byong-Ho, Il Lee Sang, Seo Il Won, Choi Gye-Woon
PublisherKorea Water Resources Association
Pages88-97
Number of pages10
ISBN (Electronic)8987898245, 9788987898247
Publication statusPublished - 2005
Event31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges - Seoul, Korea, Republic of
Duration: 2005 Sep 112005 Sep 16

Publication series

Name31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges

Conference

Conference31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges
CountryKorea, Republic of
CitySeoul
Period05/9/1105/9/16

All Science Journal Classification (ASJC) codes

  • Engineering (miscellaneous)
  • Environmental Science (miscellaneous)
  • Water Science and Technology

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  • Cite this

    Choi, S. U., & Joung, Y. (2005). Investigation of impact of secondary flows in turbulent open-channel flows using DNS data. In J. Byong-Ho, I. L. Sang, S. I. Won, & C. Gye-Woon (Eds.), 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges (pp. 88-97). (31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges). Korea Water Resources Association.