Assessment of the Destruction Causes at the Downstream Basins of Mill-Mugan Dam Using Computational Fluid Dynamics

Document Type : Research Article

Authors

Assistant Professor, Faculty of Engineering, University of Mohaghegh Ardabili

Abstract

In this research 3D hydrodynamics of Mill-Mugan diversion dam at a domain with a length of 500 meters was simulated numerically using large eddy simulation (LES) method. All of the components of the dam such as radial gates and stilling basin were considered and the causes of destruction occurrence at the downstream basins were investigated under various operating conditions. Simulated stage-discharge curve of a single radial gate was compared with data reported by dam consultant and also with relationships available in the literature, which confirms the validation of the numerical model. Furthermore, flow patterns of the numerical model were compared with images taken from the study area. Study domain were discretized using 25 million cells. Numerical simulation was performed using parallel processing and to provide the steady state condition, simulation was continued for up to 1000 seconds. Results showed that in all scenarios of the symmetric operating condition, hydraulic jump downstream of the radial gates formed inside the main stilling basin. However, the high end sill caused hydraulic obstruction and as the subcritical flow passed over the sill, critical flow formed at its top followed by a supercritical flow thereafter. Consequently, another hydraulic jump occurred when flow reached the subcritical flow in the protection trench, located downstream of the main stilling basin. Due to the diverging geometry of the side walls, a radial hydraulic jump occurred further downstream. Hydraulic jumps exert strong dynamic loads to the flexible concrete blocks inside the protection trench and it causes rupture of the chains connecting the concrete blocks. Under asymmetric operating conditions of the radial gates, hydraulic jump is swept out of the main stilling basin and it exacerbates unfavorable hydraulic conditions downstream of the dam. 

Keywords

References

 
Armenio, V., Toscano, P., and Fiorotto, V. (2000). On the effects of a negative step in pressure fluctuations at the bottom of a hydraulic jump. Journal of Hydraulic Research, 38(5), pp. 359-368.
Bremen, R., and Hager, W.H. (1993). T-jump in abruptly expanding channel. Journal of Hydraulic Research. 31(1), pp. 61-78.
Bowers, C.E. and Toso, J. (1990). Closure to Karnafuli project, model studies of spillway damage. Journal of Hydraulic Engineering, ASCE. 116(6), pp. 854-855.
Clemmens, A.J., Strelkoff, T.S. and Replogle, J.A, (2003). Calibration of submerged radial gates. Journal of Hydraulic Engineering, ASCE. 129(9), pp. 680–687. 

Castro-Orgaz, O. and Hager, W.H. (2009). Classical hydraulic jump: basic flow features. Journal of Hydraulic Research. 47(6),pp. 744:754.

Elder, R.A. (1961). Model-prototype turbulence scaling. Proceeding of IX IAHR Congress, Dubrovnik, Yugoslavia, pp. 24-31.

Fiorotto, V. and Rinaldo, A. (1990). Discussion of Karnafuli project, model studies on spillway damage. Journal of Hydraulic Engineering, ASCE. 116(6), pp. 850-852.

Fiorotto, V. and Rinaldo, A. (1991). Turbulent pressure fluctuations under hydraulic jumps. Journal of Hydraulic Research. 30(4), pp. 499-520.
Fiorotto, V. and Salandin, P. (2000). Design of anchored slabs in spillway stilling basins. Journal of Hydraulic Engineering, ASCE. 126(7), pp. 502–512.
Flow-3D® Help, Ver. 9.3.2. (2011). Flow science Inc.
Graber, S.D. (2006). Asymmetric flow in symmetric supercritical expansions. Journal of Hydraulic Engineering, ASCE. 132(2), pp. 207-213.
Habibzadeh, A., Loewen, M.R. and Rajaratnam, N. (2012). Performance of baffle blocks in submerged hydraulic jumps. Journal of Hydraulic Engineering, 138(10), pp. 902-908.
Kordi, E. and Abustan, I. (2012). Transitional expanding hydraulic jump. Journal of Hydraulic Engineering, ASCE. 138(1), pp. 105–110.
Lawson, J. and Phillips, B. (1983). Circular hydraulic jump. Journal of Hydraulic Engineering, ASCE. 109(4), pp. 505–518.
Liu, P.G. and Li, A.H. (2007). Model discussion of pressure fluctuations propagation within lining slab joints in stilling basins. Journal of Hydraulic Engineering, ASCE. 133(6), pp. 618-624.
Lopardo, R. A. (2013). Extreme velocity fluctuations below free hydraulic jumps. Journal of Engineering. doi:10.1155/2013/678064.
Mishra, K. (2011). Prediction of turbulence energy dissipation in flexible apron of barrages using numerical method. International Journal for Numerical Methods in Fluids. 69(5), pp. 897–908.
Nettleton, P.C. and McCorquodale, J.A. (1989). Radial flow stilling basins with baffle blocks. Canadian Journal of Civil Engineering. 16(4), pp. 489:497. 
Omid, M.H., Esmaeili Varaki, M. and Narayana, R. (2007). Gradually expanding hydraulic jump in a trapezoidal channel. Journal of Hydraulic Research. 45(4), pp. 512-518.
Rinaldo, A. (1986). The structural design of the lining of spillway stilling basins. Excerpta 1, pp.54-67.

Rahman, M.A. (1972). Damage to Karnafuli dam spillway. Journal of Hydraulic Division, ASCE 98(12), pp. 2155-2170.

 

Rouse, H. Siao, T.T. and Nagaratnam, S. (1959). Turbulence characteristics of the hydraulic jump. Trans. ASCE, 124, pp. 926-966.

Shahrokhnia, M.A. and Javan, M. (2006). Dimensionless stage–discharge relationship in radial gates. Journal of Irrigation and Drainage Engineering, ASCE. 132(2), pp.180:184.
Toso, J. and Bowers, C. (1988). Extreme pressures in hydraulic jump stilling basins. Journal of Hydraulic Engineering, ASCE. 114(8), pp. 829–843.
Wang, H., Felder, S. and Chanson, H. (2014). An experimental study of turbulent two-phase flow in hydraulic jumps and application of a triple decomposition technique. Experiments in Fluids. 55(7), pp. 1775.
Yurinov, D., Bosovski, L. and Drozdovski, S. (1964). Mill-Mugan intake dam on Aras River, preliminary design. Baku Hydroproject.
Zare, H.K. and Doering, J.C. (2011). Forced hydraulic jumps below abrupt expansions. Journal of Hydraulic Engineering, ASCE. 137(8),  pp.825-835.
Zobeyer, A. H., Jahan, N., Islam, Z., Singh, G., and Rajaratnam, N. (2010). Turbulence characteristics of the transition region from hydraulic jump to open channel flow. Journal of Hydraulic Research, 48(3), pp. 395-399.
Journal of Hydraulics
Volume 12, Issue 2 - Serial Number 122
September 2017
Pages 13-34

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History

  • Receive Date: 04 February 2017
  • Revise Date: 11 June 2017
  • Accept Date: 25 June 2017

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