Three dimensional simulation of flow field around series of spur dikes

Anu Acharya, Guohong Duan

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

4 Citations (Scopus)

Abstract

Erosion of the banks and bed of natural and manmade channels is a common problem in water resources management. Spur dikes in rivers and streams such as the Mississippi River are used to prevent bank erosion and to keep the main channel navigable. Scour around these dikes can be a serious problem, weakening structural stability. Three-dimensional models are often used in engineering design to determine mean and turbulence flow field around these dikes. However, a universal turbulent model that is valid for all cases of turbulent flow in open channels currently does not exist. Some turbulent closures offer advantages over others in specific turbulent flow fields depending on the nature of turbulence. Therefore, a three-dimensional numerical model, FLOW-3D, is used to simulate the turbulent flow field around a series of three spur dikes in flat and scoured bed. This study examined one equation mixing length model, standard two-equation k - ε model, Renormalization Group (RNG) k - ε model and Large Eddy Simulation (LES) model. Experimental data from a laboratory study of flow in a flat bed and scoured bed around a series of three dikes were used to verify the results from the numerical model. Although the simulated mean flow field is close to the experimental data, the simulated turbulence properties from different turbulent model deviate considerably. Modeling results using the standard k - ε model showed over 50 discrepancy from the measured turbulent kinetic energy. The RNG k - ε model yielded better results of both mean flow field and turbulence kinetic energy for the flat bed surface and scoured bed surface. Based on these results, this study recommends the use of RNG k - ε model for simulating mean flow field around dikes. Further improvements of FLOW-3D model is needed for predicting turbulence properties (e.g. TKE) near this series of spur dikes under various flow conditions.

Original languageEnglish (US)
Title of host publicationWorld Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress
Pages2085-2094
Number of pages10
DOIs
StatePublished - 2011
EventWorld Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Palm Springs, CA, United States
Duration: May 22 2011May 26 2011

Other

OtherWorld Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability
CountryUnited States
CityPalm Springs, CA
Period5/22/115/26/11

Fingerprint

flow field
dike
simulation
turbulence
turbulent flow
kinetic energy
bank erosion
large eddy simulation
scour
river
erosion
engineering

Keywords

  • Levees and dikes
  • River bank erosion
  • Simulation
  • Three-dimensional flow

ASJC Scopus subject areas

  • Environmental Science(all)

Cite this

Acharya, A., & Duan, G. (2011). Three dimensional simulation of flow field around series of spur dikes. In World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress (pp. 2085-2094) https://doi.org/10.1061/41173(414)218

Three dimensional simulation of flow field around series of spur dikes. / Acharya, Anu; Duan, Guohong.

World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress. 2011. p. 2085-2094.

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

Acharya, A & Duan, G 2011, Three dimensional simulation of flow field around series of spur dikes. in World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress. pp. 2085-2094, World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability, Palm Springs, CA, United States, 5/22/11. https://doi.org/10.1061/41173(414)218
Acharya A, Duan G. Three dimensional simulation of flow field around series of spur dikes. In World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress. 2011. p. 2085-2094 https://doi.org/10.1061/41173(414)218
Acharya, Anu ; Duan, Guohong. / Three dimensional simulation of flow field around series of spur dikes. World Environmental and Water Resources Congress 2011: Bearing Knowledge for Sustainability - Proceedings of the 2011 World Environmental and Water Resources Congress. 2011. pp. 2085-2094
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