Investigating LES Turbulence Model in Modeling the Velocity Distribution Around the Hydraulic Structure Using ANSYS

Document Type: Original Article

Authors

1 Investigating LES Turbulence Model in Modeling the Velocity Distribution Around the Hydraulic Structure Using ANSYS

2 Department of Civil Engineering, Yasuj Branch, Yasouj University, Kohgiluyeh and Boyer Ahmad, Iran.

3 Department of Civil Engineering, Bushehr Unit, Islamic Azad University, Bushehr, Iran.

Abstract

Spur dikes are river training structures used for prevention of erosion at river banks and cause distancing of flow from the critical zone and creation of local contraction in water flow. In the present study, 2D modeling of the flow pattern around a spur dike in a straight canal with 6m length and 0.45m width is presented. Also the finite element method is utilized for solving the differential equations. Modeling of the turbulent flow around a single spur dike is performed using k- model in 𝜺 ANSYS software and the results were compared to those of the experimental study. The results show that the finite element method, by incorporating the k- model, models the flow pattern around the spur dike well and yields an average error value 𝜺 of 12.57%, and this shows a good agreement between the numerical modeling results and those of the experimental study.

Keywords


1. Osman AM, Thorne CR. Riverbank stability analysis. I: Theory. Journal of Hydraulic Engineering. 1988;114(2):134-50.

2. Lagasse PF. Riprap design criteria, recommended specifications, and quality control: Transportation Research Board; 2006.

3. Nagata N, Hosoda T, Nakato T, Muramoto Y. Three-dimensional numerical model for flow and bed deformation around river hydraulic structures. Journal of Hydraulic Engineering. 2005;131(12):1074-87.

4. Koken M, Constantinescu G. An investigation of the flow and scour mechanisms around isolated spur dikes in a shallow open channel: 1. Conditions corresponding to the initiation of the erosion and deposition process. Water Resources Research. 2008;44(8).

5. Duan JG. Mean flow and turbulence around a laboratory spur dike. Journal of Hydraulic Engineering. 2009;135(10):803-11.

6. Duan JG, He L, Fu X, Wang Q. Mean flow and turbulence around experimental spur dike. Advances in Water Resources. 2009;32(12):1717-25.

7. Nagy HM. Hydraulic evaluation of emerged and submerged spur-dikes: temporal bed evolution and equilibrium state characteristics. Alexandria engineering journal. 2005;44(2):279-90.

8. Uijttewaal W, Booij R. Effects of shallowness on the development of freesurface mixing layers. Physics of fluids. 2000;12(2):392-402.

9. Uijttewaal WS. Effects of groyne layout on the flow in groyne fields: Laboratory experiments. Journal of Hydraulic Engineering. 2005;131(9):782- 91.

10. ELAWADY E, MICHIUE M, HINOKIDANI O. Experimental study of flow behavior around submerged spur-dike on rigid bed. PROCEEDINGS OF HYDRAULIC ENGINEERING. 2000;44:539-44.

11. Kumar M, Malik A. 3D Simulation of Flow around Different Types of Groyne Using ANSYS Fluent. Imperial Journal of Interdisciplinary Research. 2016;2(10).

12. Salamatian S, Forghani M, Tabarestani MK. Flow Pattern and Stress Distribution around Three Spur Dike in Ninety Degree Bend. International Journal of Engineering and Technology. 2016;8(6).

13. Manual AUs. Ansys. Inc Modeling, CFX. 2000;11.

14. VAGHEFI M, SHAKERDARGAH M, AKBARI M. Numerical investigation of the effect of Froude number on flow pattern around a submerged T-shaped spur dike in a 90$^{circ} $ bend. Turkish Journal of Engineering and Environmental Sciences. 2015;38(2):266-77.

15. Tang X, Ding X, Chen Z. Large eddy simulations of three-dimensional flows around a spur dike. Tsinghua Science & Technology. 2006;11(1):117- 23.

16. Karami H, Basser H, Ardeshir A, Hosseini SH. Verification of numerical study of scour around spur dikes using experimental data. Water and environment journal. 2014;28(1):124-34.