NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM/OUTLET ANGLE ON HYDRAULIC PARAMETERS

Farshid Pakgar; Rasoul Daneshfaraz; Ali Rezazadeh Joudı

NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM/OUTLET ANGLE ON HYDRAULIC PARAMETERS

Abstract

Spillways are the main hydraulic structures used to drain excess flow volume of dam reservoirs. It is essential to study siphon overflows due to simple geometric structure, automatic function and acceptable capacity. Numerical values of overflow siphon hydraulic parameters were calculated in this study. For this purpose, the geometrical domain of the solution was designed using GAMBIT Software, and the numerical simulation of flow was carried out using Fluent Software. Then, the experimental results were compared with actual results. The data used in the validation section was collected from calculation of absolute pressure in the lower part of the spillway body. After verification of the results, the study mainly aimed to evaluate the effect of a cup-shaped damper angle of the spillway outlet on hydraulic parameters of flow. For this purpose, four groups of hydraulic parameters were used: absolute pressure in the lower part of the spillway body, distribution of velocity at the spillway downstream, energy dissipation and the siphon spillway discharge coefficient. The cup-shaped damper radial angles were 30, 45 and 60 degrees. The results showed that mean velocity at a spillway downstream at a 60° outlet angle was higher than other outlet angles in all discharges. The greatest energy dissipation was observed in the spillway with a 30° outlet angle. In addition, the discharge coefficient increased by increasing the cup-shaped damper angle. However, the discharge coefficient decreased by increasing flow discharge. Absolute pressure on the lower part of spillway body was the only parameter that was not affected by changes in the spillway outlet angle.

Keywords

References

[1] Babaeyan-Koopaei, K., Valentine, E.M., Alan Ervine, D. (2002) Case study on hydraulic performance of Brent Reservoir siphon spillway. Journal of Hydraulic Engineering. ASCE, 128(6): 562-67.
[2] Chamani, M R., Dehghani, A A., Beirami, M K., Gholipour, R. (2009) Fluid Mechanics, Isfahan Industrial University’s Publication, Iran. (In Persian).
[3] Daneshfaraz, R. (2010) Fluid Mechanics. Maragheh University’s Publication, Iran. (In Persian).
[4] Daneshfaraz, R., Nikpour, V., Sadeghi, H. (2013) Simulation of hydraulic problems. Amidi Publications, Tabriz, Iran. (In Persian).
[5] Dornack, S., Horlacher, H. B. (1999) Hydraulic model experiments for the siphon spillway of the Oker Dam. In 28th IAHR Congress.
[6] Ghafourian, A., Mousavi jahromi, H., Shafaee bajestan, M. (2011) Hydraulic of Siphon Spillway by Physical and Computational Fluid Dynamics. World applied sciences journal, 14(8): 1240-1245.
[7] Hirt, C.W., Nichols, B.D. (1981) Volume of fluid (VOF) method for the dynamics of free boundaries. J. Computational. Physics, 39: 201-5.
[8] Holder, G.K., Schimpff, M.C.E.J. (1999) West Project: analysis of discharge structures. Proc. of Waterpower Conference. Peggy A. Brookshire editor, Las Vegas, Nevada, USA.

[9] Houichi, L., Ibrahim, G., Achour, B. (2006) Experiments for the discharge capacity of the siphon spillway having the Creager-Ofitserov profile. Int. J. Fluid Mechanics Res., 5: 395-06.
[10] IUT Computational Fluid Dynamics Group Website
[11] Jourabloo, M., (2010) Investigation on siphon spillway’s hydraulic. M Sc thesis, Islamic Azad University, Tehran’s Science and Research branch. (In Persian).
[12] Lucke, T., Beecham, S. (2010) Capacity loss in siphonic roof drainage systems due to aeration. Building Research & Information, 38(2), 206-217.
[13] Mousavi-Jahromi, S.H., (2011) Simulation of pizometric pressure in dam siphon spillways, World Applied Sciences Journal, 12 (7): 1074-1083.
[14] Oliver, G. (1980) The full-scale behavior of air-regulated siphon spillways. In ICE Proceedings (Vol. 69, No. 3, pp. 687-706). Thomas Telford.
[15] Patankar S.V. (1980) Numerical heat transfer and fluid flow. Hemisphere Publishing Corporation, Taylor & Francis Group, New York.
[16] Roberson, J.A., Cassidy, J.J., Chaudhry, M.H. (1998) Hydraulic engineering, Second edition. John Wiley & Sons, New York, USA.
[17] Roberson, J.A., Cassidy, J.J., Chaudhry, M.H. (1998) Hydraulic engineering, Second edition. John Wiley & Sons, New York, USA.
[18] Shojaei fard, M H., and Nourpour, A. (2010) An Introduction on Computational Fluid Dynamics. Science and Industry University’s Publication. (In Persian).
[19] Tasi, W., Yue, D. (1996) Computation of nonlinear free surface flows. Annu. Rev. Fluid Mech., 28: 249.
[20] Vischer, D.L., Hager, W.H. (1997) Dam hydraulics, John Wiley and Sons Ltd, England.

Details

Primary Language

English

Subjects

-

Journal Section

Research Article

Authors

Farshid Pakgar This is me
Iran

Rasoul Daneshfaraz This is me
Iran

Ali Rezazadeh Joudı This is me
Iran

Publication Date

June 1, 2016

Submission Date

December 29, 2015

Acceptance Date

June 3, 2016

Published in Issue

Year 2016 Volume: 34 Number: 2

IZ

https://izlik.org/JA59PE34ER

Cite

RIS / Bibtex

APA

Pakgar, F., Daneshfaraz, R., & Joudı, A. R. (2016). NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM/OUTLET ANGLE ON HYDRAULIC PARAMETERS. Sigma Journal of Engineering and Natural Sciences, 34(2), 279-290. https://izlik.org/JA59PE34ER

AMA

1.Pakgar F, Daneshfaraz R, Joudı AR. NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM/OUTLET ANGLE ON HYDRAULIC PARAMETERS. SIGMA. 2016;34(2):279-290. https://izlik.org/JA59PE34ER

Chicago

Pakgar, Farshid, Rasoul Daneshfaraz, and Ali Rezazadeh Joudı. 2016. “NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM OUTLET ANGLE ON HYDRAULIC PARAMETERS”. Sigma Journal of Engineering and Natural Sciences 34 (2): 279-90. https://izlik.org/JA59PE34ER.

EndNote

Pakgar F, Daneshfaraz R, Joudı AR (June 1, 2016) NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM/OUTLET ANGLE ON HYDRAULIC PARAMETERS. Sigma Journal of Engineering and Natural Sciences 34 2 279–290.

IEEE

[1]F. Pakgar, R. Daneshfaraz, and A. R. Joudı, “NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM/OUTLET ANGLE ON HYDRAULIC PARAMETERS”, SIGMA, vol. 34, no. 2, pp. 279–290, June 2016, [Online]. Available: https://izlik.org/JA59PE34ER

ISNAD

Pakgar, Farshid - Daneshfaraz, Rasoul - Joudı, Ali Rezazadeh. “NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM OUTLET ANGLE ON HYDRAULIC PARAMETERS”. Sigma Journal of Engineering and Natural Sciences 34/2 (June 1, 2016): 279-290. https://izlik.org/JA59PE34ER.

JAMA

1.Pakgar F, Daneshfaraz R, Joudı AR. NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM/OUTLET ANGLE ON HYDRAULIC PARAMETERS. SIGMA. 2016;34:279–290.

MLA

Pakgar, Farshid, et al. “NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM OUTLET ANGLE ON HYDRAULIC PARAMETERS”. Sigma Journal of Engineering and Natural Sciences, vol. 34, no. 2, June 2016, pp. 279-90, https://izlik.org/JA59PE34ER.

Vancouver

1.Farshid Pakgar, Rasoul Daneshfaraz, Ali Rezazadeh Joudı. NUMERICAL SIMULATION OF FLOW ON A SIPHON SPILLWAY AND INVESTIGATION OF THE EFFECT OF A BOTTOM/OUTLET ANGLE ON HYDRAULIC PARAMETERS. SIGMA [Internet]. 2016 Jun. 1;34(2):279-90. Available from: https://izlik.org/JA59PE34ER