Study of Turbulence in Open Channels Using Two-Equation Models

Ahmad Sana; Ghazi Al-Rawas; Talal Etri; Abdullah Al-Mamun

Study of Turbulence in Open Channels Using Two-Equation Models

Ahmad Sana, Ghazi Al-Rawas, Talal Etri, Abdullah Al-Mamun

Civil and Architectural Engineering

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

Abstract

Prediction of the sediment transport in streams requires an accurate estimation of bed shear stress (for bed load) and eddy viscosity (for suspended load). In general, shallow water models employ empirical relationships to estimate the bottom shear stress. However, with the advancement of computing systems, the utilization of advanced turbulence models is getting common. In this paper, a number of model versions are reviewed based on their predictive abilities against the well-known bottom boundary layer properties in open channels and computational economy. Qualitative and quantitative comparisons have been made to infer that the choice of model versions should be based on the field application. For example, the bottom shear stress is very well predicted by the k- model whereas the cross-stream velocity profile and turbulent kinetic energy are predicted more efficiently by k- model versions. This study may be useful for researchers and practicing engineers in selecting a suitable two-equation model for calculating various bottom boundary layer properties.

Original language	English
Title of host publication	Proceedings, The 2nd International Conference on Civil Infrastructure and Construction
Publication status	Published - Feb 2023

Keywords

Turbulence model, Open channel, Bottom roughness, Bed shear stress, Turbulent flow, k- model, k- model

ASJC Scopus subject areas

Civil and Structural Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Cite this

@inproceedings{80dbfe094c894bdbb586115e003f6a76,

title = "Study of Turbulence in Open Channels Using Two-Equation Models",

abstract = "Prediction of the sediment transport in streams requires an accurate estimation of bed shear stress (for bed load) and eddy viscosity (for suspended load). In general, shallow water models employ empirical relationships to estimate the bottom shear stress. However, with the advancement of computing systems, the utilization of advanced turbulence models is getting common. In this paper, a number of model versions are reviewed based on their predictive abilities against the well-known bottom boundary layer properties in open channels and computational economy. Qualitative and quantitative comparisons have been made to infer that the choice of model versions should be based on the field application. For example, the bottom shear stress is very well predicted by the k- model whereas the cross-stream velocity profile and turbulent kinetic energy are predicted more efficiently by k- model versions. This study may be useful for researchers and practicing engineers in selecting a suitable two-equation model for calculating various bottom boundary layer properties.",

keywords = "Turbulence model, Open channel, Bottom roughness, Bed shear stress, Turbulent flow, k- model, k- model",

author = "Ahmad Sana and Ghazi Al-Rawas and Talal Etri and Abdullah Al-Mamun",

year = "2023",

month = feb,

language = "English",

booktitle = "Proceedings, The 2nd International Conference on Civil Infrastructure and Construction",

}

TY - GEN

T1 - Study of Turbulence in Open Channels Using Two-Equation Models

AU - Sana, Ahmad

AU - Al-Rawas, Ghazi

AU - Etri, Talal

AU - Al-Mamun, Abdullah

PY - 2023/2

Y1 - 2023/2

N2 - Prediction of the sediment transport in streams requires an accurate estimation of bed shear stress (for bed load) and eddy viscosity (for suspended load). In general, shallow water models employ empirical relationships to estimate the bottom shear stress. However, with the advancement of computing systems, the utilization of advanced turbulence models is getting common. In this paper, a number of model versions are reviewed based on their predictive abilities against the well-known bottom boundary layer properties in open channels and computational economy. Qualitative and quantitative comparisons have been made to infer that the choice of model versions should be based on the field application. For example, the bottom shear stress is very well predicted by the k- model whereas the cross-stream velocity profile and turbulent kinetic energy are predicted more efficiently by k- model versions. This study may be useful for researchers and practicing engineers in selecting a suitable two-equation model for calculating various bottom boundary layer properties.

AB - Prediction of the sediment transport in streams requires an accurate estimation of bed shear stress (for bed load) and eddy viscosity (for suspended load). In general, shallow water models employ empirical relationships to estimate the bottom shear stress. However, with the advancement of computing systems, the utilization of advanced turbulence models is getting common. In this paper, a number of model versions are reviewed based on their predictive abilities against the well-known bottom boundary layer properties in open channels and computational economy. Qualitative and quantitative comparisons have been made to infer that the choice of model versions should be based on the field application. For example, the bottom shear stress is very well predicted by the k- model whereas the cross-stream velocity profile and turbulent kinetic energy are predicted more efficiently by k- model versions. This study may be useful for researchers and practicing engineers in selecting a suitable two-equation model for calculating various bottom boundary layer properties.

KW - Turbulence model, Open channel, Bottom roughness, Bed shear stress, Turbulent flow, k- model, k- model

M3 - Conference contribution

BT - Proceedings, The 2nd International Conference on Civil Infrastructure and Construction

ER -