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

Sung Uk Choi; Younghoon Joung

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

Department of Civil and Environmental Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English
Title of host publication	31st IAHR Congress 2005
Subtitle of host publication	Water Engineering for the Future, Choices and Challenges
Editors	Jun Byong-Ho, Il Lee Sang, Seo Il Won, Choi Gye-Woon
Publisher	Korea Water Resources Association
Pages	88-97
Number of pages	10
ISBN (Electronic)	8987898245, 9788987898247
Publication status	Published - 2005
Event	31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges - Seoul, Korea, Republic of Duration: 2005 Sept 11 → 2005 Sept 16

Publication series

Name	31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges

Conference

Conference	31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges
Country/Territory	Korea, Republic of
City	Seoul
Period	05/9/11 → 05/9/16

Bibliographical note

Publisher Copyright:
© 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges. All Rights Reserved.

All Science Journal Classification (ASJC) codes

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

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.

Choi, Sung Uk ; Joung, Younghoon. / Investigation of impact of secondary flows in turbulent open-channel flows using DNS data. 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges. editor / Jun Byong-Ho ; Il Lee Sang ; Seo Il Won ; Choi Gye-Woon. Korea Water Resources Association, 2005. pp. 88-97 (31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges).

@inproceedings{6b98a4a878314081a88512a2d74b9ea7,

title = "Investigation of impact of secondary flows in turbulent open-channel flows using DNS data",

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.",

author = "Choi, {Sung Uk} and Younghoon Joung",

note = "Publisher Copyright: {\textcopyright} 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges. All Rights Reserved.; 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges ; Conference date: 11-09-2005 Through 16-09-2005",

year = "2005",

language = "English",

series = "31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges",

publisher = "Korea Water Resources Association",

pages = "88--97",

editor = "Jun Byong-Ho and Sang, {Il Lee} and Won, {Seo Il} and Choi Gye-Woon",

booktitle = "31st IAHR Congress 2005",

}

Choi, SU & Joung, Y 2005, Investigation of impact of secondary flows in turbulent open-channel flows using DNS data. in J Byong-Ho, IL Sang, SI Won & C Gye-Woon (eds), 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges. 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges, Korea Water Resources Association, pp. 88-97, 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges, Seoul, Korea, Republic of, 05/9/11.

Investigation of impact of secondary flows in turbulent open-channel flows using DNS data. / Choi, Sung Uk; Joung, Younghoon.

31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges. ed. / Jun Byong-Ho; Il Lee Sang; Seo Il Won; Choi Gye-Woon. Korea Water Resources Association, 2005. p. 88-97 (31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Investigation of impact of secondary flows in turbulent open-channel flows using DNS data

AU - Choi, Sung Uk

AU - Joung, Younghoon

PY - 2005

Y1 - 2005

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85084745789&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85084745789&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85084745789

T3 - 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges

SP - 88

EP - 97

BT - 31st IAHR Congress 2005

A2 - Byong-Ho, Jun

A2 - Sang, Il Lee

A2 - Won, Seo Il

A2 - Gye-Woon, Choi

PB - Korea Water Resources Association

T2 - 31st IAHR Congress 2005: Water Engineering for the Future, Choices and Challenges

Y2 - 11 September 2005 through 16 September 2005

ER -

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

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

Abstract

Publication series

Conference

Bibliographical note

All Science Journal Classification (ASJC) codes

Other files and links

Fingerprint

Cite this