Turbulence modeling of solute transport in open-channel flows over submerged vegetation

Hyeongsik Kang, Sung-Uk Choi

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

3 Citations (Scopus)

Abstract

A model for numerical simulations of solute transport in vegetated open-channel flows is proposed. The Reynolds-Averaged Navier-Stokes model is used for the flow analysis. For the turbulence closure, the Reynolds stress model is used, and the generalized gradient diffusive hypothesis is used to close the Reynolds-averaged advection/diffusion equation. The developed model is applied to an experimental case of solute transport in turbulent open-channel flows over submerged vegetation reported by Ghisalberti and Nepf (2005). The simulated distributions of mean concentration along the streamwise direction are compared with measured data, showing a good agreement. In addition, numerical simulations reveal that the pattern of secondary currents in vegetated open-channel flows is significantly different from that in plain open-channel flows. Using the simulated results, the vertical turbulent Schmidt number for the vegetated open-channel flow is estimated and a value of 0.58 is obtained. This value can be compared to 0.47, which was obtained by Ghisalberti and Nepf (2005) using laboratory data.

Original languageEnglish
Title of host publicationAdvances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS
PublisherSpringer-Verlag Berlin Heidelberg
Pages674-679
Number of pages6
ISBN (Print)9783540894643
Publication statusPublished - 2009 Jan 1
Event16th Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research, APD 2008 and the 3rd IAHR International Symposium on Hydraulic Structures, ISHS 2008 - Nanjing, China
Duration: 2008 Oct 202008 Oct 23

Publication series

NameAdvances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS

Other

Other16th Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research, APD 2008 and the 3rd IAHR International Symposium on Hydraulic Structures, ISHS 2008
CountryChina
CityNanjing
Period08/10/2008/10/23

Fingerprint

Open channel flow
Solute transport
Turbulence
Computer simulation
Advection

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering

Cite this

Kang, H., & Choi, S-U. (2009). Turbulence modeling of solute transport in open-channel flows over submerged vegetation. In Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS (pp. 674-679). (Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS). Springer-Verlag Berlin Heidelberg.
Kang, Hyeongsik ; Choi, Sung-Uk. / Turbulence modeling of solute transport in open-channel flows over submerged vegetation. Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS. Springer-Verlag Berlin Heidelberg, 2009. pp. 674-679 (Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS).
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abstract = "A model for numerical simulations of solute transport in vegetated open-channel flows is proposed. The Reynolds-Averaged Navier-Stokes model is used for the flow analysis. For the turbulence closure, the Reynolds stress model is used, and the generalized gradient diffusive hypothesis is used to close the Reynolds-averaged advection/diffusion equation. The developed model is applied to an experimental case of solute transport in turbulent open-channel flows over submerged vegetation reported by Ghisalberti and Nepf (2005). The simulated distributions of mean concentration along the streamwise direction are compared with measured data, showing a good agreement. In addition, numerical simulations reveal that the pattern of secondary currents in vegetated open-channel flows is significantly different from that in plain open-channel flows. Using the simulated results, the vertical turbulent Schmidt number for the vegetated open-channel flow is estimated and a value of 0.58 is obtained. This value can be compared to 0.47, which was obtained by Ghisalberti and Nepf (2005) using laboratory data.",
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Kang, H & Choi, S-U 2009, Turbulence modeling of solute transport in open-channel flows over submerged vegetation. in Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS. Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS, Springer-Verlag Berlin Heidelberg, pp. 674-679, 16th Congress of Asia and Pacific Division of International Association of Hydraulic Engineering and Research, APD 2008 and the 3rd IAHR International Symposium on Hydraulic Structures, ISHS 2008, Nanjing, China, 08/10/20.

Turbulence modeling of solute transport in open-channel flows over submerged vegetation. / Kang, Hyeongsik; Choi, Sung-Uk.

Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS. Springer-Verlag Berlin Heidelberg, 2009. p. 674-679 (Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS).

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

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N2 - A model for numerical simulations of solute transport in vegetated open-channel flows is proposed. The Reynolds-Averaged Navier-Stokes model is used for the flow analysis. For the turbulence closure, the Reynolds stress model is used, and the generalized gradient diffusive hypothesis is used to close the Reynolds-averaged advection/diffusion equation. The developed model is applied to an experimental case of solute transport in turbulent open-channel flows over submerged vegetation reported by Ghisalberti and Nepf (2005). The simulated distributions of mean concentration along the streamwise direction are compared with measured data, showing a good agreement. In addition, numerical simulations reveal that the pattern of secondary currents in vegetated open-channel flows is significantly different from that in plain open-channel flows. Using the simulated results, the vertical turbulent Schmidt number for the vegetated open-channel flow is estimated and a value of 0.58 is obtained. This value can be compared to 0.47, which was obtained by Ghisalberti and Nepf (2005) using laboratory data.

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Kang H, Choi S-U. Turbulence modeling of solute transport in open-channel flows over submerged vegetation. In Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS. Springer-Verlag Berlin Heidelberg. 2009. p. 674-679. (Advances in Water Resources and Hydraulic Engineering - Proceedings of 16th IAHR-APD Congress and 3rd Symposium of IAHR-ISHS).