Numerical Investigation of Cavitation on Spillways. A Case Study: Aydoghmush dam

Document Type : Research

Authors

1 M.Sc. Student of Civil Engineering Department, Ahar Branch, Islamic Azad University, Ahar, Iran.

2 PhD Student of Civil Engineering Department, University of Qom, Qom. Iran.

3 Ph.D. Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran.

4 Associate Professor, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran.

5 PhD Student of Civil Engineering Department, Boshehr Branch, Islamic Azad University, Boshehr, Iran.

Abstract

Cavitation is among the most complicated and common damages of spillway structures. This phenomenon is controlled by different parameters including the pressure, flow velocity, spillway surface material, operation time, and air flow content. The cavitation index is calculated along the spillway and compared with its critical value using the measured values of the flow’s hydraulic parameters. The high cost of experimental models for determining hydraulic parameters, the time required for developing experimental models, and the ever-increasing capabilities of computational fluid mechanics (CFD) models have led to the use of numerical simulation in the flow analyses. The present study employs ANSYS FLUENT to simulate the flow on the spillway of Aydoghmush Dam (Iran), calculate flow parameters, and determine the cavitation index at the flow rates of 35, 800, 1500, and 1850 m3/s. The standard k-ε equations were applied to model the turbulent flow, while the volume of fluid (VOF) method was employed to determine the flow’s free surface profile. The results showed acceptable consistency between the FLUENT and physical model results. It was also found that cavitation did not occur at any of the flow rates.

Keywords

References

1. Colgate, Donald.,(1977) .Cavitation Damage in Hydraulic Structures. Wear of Materials, American Society of Mechanical Engineers, New York.
2. Parsaie, A., Dehdar-Behbahani, S. & Haghiabi, A.H. (2016). Numerical modeling of cavitation on spillway's flip bucket. Front. Struct. Civ. Eng. 10, 438-444. [DOI:10.1007/s11709-016-0337-y]
3. Dehdar-Behbahani, S., & Parsaie, A. (2016). Numerical modeling of flow pattern in dam spillway's guide wall. Case study: Balaroud dam, Iran. Alexandria Engineering Journal, 55(1), 467-473. https://doi.org/10.1016/j.aej.2016.01.006 [DOI:10.1016/j.aej.2016.01.006.]
4. Zandi, Y. , (2005). Cavitation in overflows, Tabriz Islamic Azad University Press.
5. Parsaie, A., Haghiabi, A.H. & Moradinejad, .A (2015). CFD modeling of flow pattern in spillway's approach channel. Sustain. Water Resour. Manag. 1, 245-251. https://doi.org/10.1007/s40899-015-0020-9 [DOI:10.1007/s40899-015-0020-9.]
6. Parsaie, A., & Haghiabi, A. (2015). The Effect of Predicting Discharge Coefficient by Neural Network on Increasing the Numerical Modeling Accuracy of Flow Over Side Weir. Water resources management, 29, 973-985. doi: 10.1007/s11269-014-0827-4 [DOI:10.1007/s11269-014-0827-4]
7. Ibn Jalal, R. And Mehri, M., (2008). Evaluation of vacuum over Ballaroud Dam overflow using physical model",4th National Congress of Civil Engineering, University of Tehran,.
8. Cassidy J J (1965). Irrotational flow over spillways of finite height", J. Eng. Mech. Div., ASCE91, , (6):155-173. [DOI:10.1061/JMCEA3.0000692]
9. Ikegawa M, Washizu K.( 1973). Finite element method applied to analysis of flow over a spillway crest",J. Numer. Methods Eng.,6: 179-189. [DOI:10.1002/nme.1620060204]
10. Betts, P. (1979).A variational principle in terms of stream function for free-surface flows and its application to the finite element method. Computers & Fluids - COMPUT FLUIDS, 7. 145-153. 10.1016/0045-7930(79)90030-6. [DOI:10.1016/0045-7930(79)90030-6]
11. Li W, Xie Q, Chen C J (1989). Finite analytical solution of flow over spillway.J. Eng. Mech. ASCE115: 2635-2647. [DOI:10.1061/(ASCE)0733-9399(1989)115:12(2635)]
12. Olsen, N & Kjellesvig, H,(1998). Three-Dimensional Numerical Flow Modelling for Estimation of Spillway Capacity. Journal of Hydraulic Research. 36. 775-784. 10.1080/00221689809498602. [DOI:10.1080/00221689809498602]
13. Burgisser M F, Rutschmann P (1999). Numerical solution of viscous 2-D vertical free surface flows:Flow over spillway crests.Proc. 28th IAHR Congress, Technical University, Graz, Austria.
14. Song, C & Zhou, F (1999).Simulation of Free Surface Flow over Spillway. Journal of Hydraulic Engineering-asce - J HYDRAUL ENG-ASCE. 125. 10.1061/(ASCE)0733-9429(1999)125:9(959). [DOI:10.1061/(ASCE)0733-9429(1999)125:9(959)]
15. Unami K, Kawachi T, Munir Baber M, Itagaki H (1999).Two dimensional numerical model of spillwayflow.J. Hydrol. Eng. ASCE125: 369-375. [DOI:10.1061/(ASCE)0733-9429(1999)125:4(369)]
16. Tufi M A (2001).Solution for spillway flow by finite difference method. J.Hydr.Res.vol.39 (3),pp:241-247. [DOI:10.1080/00221680109499827]
17. Bruce M S, Michael C J (2001). Flow over Ogee spillway; physical and numerical model case study.J. Hydrol. Eng. ASCE127: 640-649. [DOI:10.1061/(ASCE)0733-9429(2001)127:8(640)]
18. Barani,GH. And Bahrami, A. (2008). Investigation of effective factors in aeration and role of aeration in preventing cavitation in dam overflow, 3rd Iranian Water Resources Management Conference, Tabriz University.
19. Mirbagheri, S.A., Mansouri, M. N. (2005). Solution of Flow Field Equation & Verification of Cavitation Problem On Spillway Of The Dam, International Journal of Engineering.
20. Hosseinzadeh, A., Azar partovi, Sh. And Farsadizadeh, d. , (2008). Flow analysis and cavitation analysis in the overflow firing of the Grammys dam using the HEC-RAS model, 3rd Iranian Water Resources Management Conference, Tabriz University.
21. Khorshidi, h. Taleb bidokht,N. Nikseresht, A. H. (2008). Investigation of cavitation phenomena in inferior dischargers of Sefidrood dam with Fluent, 4th National Congress of Civil Engineering, University of Tehran.
22. Kavianpour, M.E. Hajikandi,H. , Pirouz,B. ( 2008). Numerical Solution of Aeration Flow Downstream of Aerators in Lower Sefidroud Dam Dischargers, 3rd Iranian Water Resources Management Conference, Tabriz University.
23. Shamsaei, A. And Mohammadi, AS. ( 2008). Study of the effect of step geometry on energy loss in stepped weirs by numerical simulation, 3rd Iranian Water Resources Management Conference, Tabriz University.
24. Dargahi B. (2006).Experimental Stady & 3D Numerical Simulation For A Free-Overflowe Spillway, J. Hyd. Eng., ASCE. [DOI:10.1061/(ASCE)0733-9429(2006)132:9(899)]
25. Shafaei Bejestan, M.S. And Arianfar, AS. ( 2008). Numerical study of flow pattern around cylindrical bridge foundations by Fluent, 4th National Congress of Civil Engineering, University of Tehran.
26. Cheng, Xiangju & Chen, Yongcan & Luo, Lin. (2006). Numerical simulation of air-water two-phase flow over stepped spillways. Science in China Series E: Technological Sciences. 49. 674-684. 10.1007/s10288-006-2029-2. [DOI:10.1007/s10288-006-2029-2]
27. Bandab Consulting Engineers (1996). Landscape of Aidoghmush Dam Project, East Azerbaijan Regional Water Organization Technical Archive.
Numerical Methods in Civil Engineering
Volume 4, Issue 1
September 2019
Pages 1-9

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History

  • Receive Date: 26 May 2019
  • Revise Date: 01 July 2019
  • Accept Date: 01 August 2019

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