Numerical and experimental analysis of shallow turbulent flow over complex roughness beds

Yong Zhang; Matteo Rubinato; Ehsan Kazemi; Jaan H. Pu; Yuefei  Huang; Pengzhi Lin

doi:10.1080/10618562.2019.1643845

Numerical and experimental analysis of shallow turbulent flow over complex roughness beds

Yong Zhang, Matteo Rubinato, Ehsan Kazemi, Jaan H. Pu, Yuefei Huang, Pengzhi Lin

EEC School of Energy, Construction and Environment

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

44 Downloads (Pure)

Abstract

A set of shallow-water equations (SWEs) based on a (Formula presented.) Reynold stress model is established to simulate the turbulent flows over a complex roughness bed. The fundamental equations are discretized by the second-order finite-difference method (FDM), in which spatial and temporal discretization are conducted by staggered-grid and leap-frog schemes, respectively. The turbulent model in this study stems from the standard (Formula presented.) model, but is enhanced by replacing the conventional vertical production with a more rigorous and precise generation derived from the energy spectrum and turbulence scales. To verify its effectiveness, the model is applied to compute the turbulence in complex flow surroundings (including a rough bed) in an abrupt bend and in a natural waterway. The comparison of the model results against experimental data and other numerical results shows the robustness and accuracy of the present model in describing hydrodynamic characteristics, especially turbulence features on the complex roughness bottom.

Original language	English
Pages (from-to)	202-221
Number of pages	20
Journal	International Journal of Computational Fluid Dynamics
Volume	33
Issue number	5
Early online date	24 Jul 2019
DOIs	https://doi.org/10.1080/10618562.2019.1643845
Publication status	Published - 2019

Bibliographical note

This is an Accepted Manuscript of an article published by Taylor & Francis in International Journal of Computational Fluid Dynamics on 24/07/2019 available online: http://www.tandfonline.com/10.1080/10618562.2019.1643845

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

Keywords

Energy spectrum
SWE model
roughness bed
shallow flows
turbulent flows

ASJC Scopus subject areas

Computational Mechanics
Aerospace Engineering
Condensed Matter Physics
Energy Engineering and Power Technology
Mechanics of Materials
Mechanical Engineering

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10.1080/10618562.2019.1643845

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Cite this

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title = "Numerical and experimental analysis of shallow turbulent flow over complex roughness beds",

abstract = "A set of shallow-water equations (SWEs) based on a (Formula presented.) Reynold stress model is established to simulate the turbulent flows over a complex roughness bed. The fundamental equations are discretized by the second-order finite-difference method (FDM), in which spatial and temporal discretization are conducted by staggered-grid and leap-frog schemes, respectively. The turbulent model in this study stems from the standard (Formula presented.) model, but is enhanced by replacing the conventional vertical production with a more rigorous and precise generation derived from the energy spectrum and turbulence scales. To verify its effectiveness, the model is applied to compute the turbulence in complex flow surroundings (including a rough bed) in an abrupt bend and in a natural waterway. The comparison of the model results against experimental data and other numerical results shows the robustness and accuracy of the present model in describing hydrodynamic characteristics, especially turbulence features on the complex roughness bottom.",

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AU - Lin, Pengzhi

N1 - This is an Accepted Manuscript of an article published by Taylor & Francis in International Journal of Computational Fluid Dynamics on 24/07/2019 available online: http://www.tandfonline.com/10.1080/10618562.2019.1643845 Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.

PY - 2019

Y1 - 2019

N2 - A set of shallow-water equations (SWEs) based on a (Formula presented.) Reynold stress model is established to simulate the turbulent flows over a complex roughness bed. The fundamental equations are discretized by the second-order finite-difference method (FDM), in which spatial and temporal discretization are conducted by staggered-grid and leap-frog schemes, respectively. The turbulent model in this study stems from the standard (Formula presented.) model, but is enhanced by replacing the conventional vertical production with a more rigorous and precise generation derived from the energy spectrum and turbulence scales. To verify its effectiveness, the model is applied to compute the turbulence in complex flow surroundings (including a rough bed) in an abrupt bend and in a natural waterway. The comparison of the model results against experimental data and other numerical results shows the robustness and accuracy of the present model in describing hydrodynamic characteristics, especially turbulence features on the complex roughness bottom.

AB - A set of shallow-water equations (SWEs) based on a (Formula presented.) Reynold stress model is established to simulate the turbulent flows over a complex roughness bed. The fundamental equations are discretized by the second-order finite-difference method (FDM), in which spatial and temporal discretization are conducted by staggered-grid and leap-frog schemes, respectively. The turbulent model in this study stems from the standard (Formula presented.) model, but is enhanced by replacing the conventional vertical production with a more rigorous and precise generation derived from the energy spectrum and turbulence scales. To verify its effectiveness, the model is applied to compute the turbulence in complex flow surroundings (including a rough bed) in an abrupt bend and in a natural waterway. The comparison of the model results against experimental data and other numerical results shows the robustness and accuracy of the present model in describing hydrodynamic characteristics, especially turbulence features on the complex roughness bottom.

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Numerical and experimental analysis of shallow turbulent flow over complex roughness beds

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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