Efficient approaches to reduce cavitation damage risk in the bottom outlet: Case study of Seymareh dam

Jamali Rovesht, Tohid; Manafpour, Mohammad

doi:10.22061/jcarme.2026.8583.2151

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	Efficient approaches to reduce cavitation damage risk in the bottom outlet: Case study of Seymareh dam
Journal of Computational & Applied Research in Mechanical Engineering (JCARME)
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 03 اسفند 1404 اصل مقاله (1.3 M)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22061/jcarme.2026.8583.2151
نویسندگان
Tohid Jamali Rovesht¹؛ Mohammad Manafpour^* ²
¹Department of ArGEnCo, Research Group Hydraulics in Environmental and Civil Engineering (HECE), Liège University, Liège, Belgium.
²Department of Civil Engineering, Faculty of Engineering, Urmia University, Urmia, Iran
تاریخ دریافت: 18 آبان 1400، تاریخ بازنگری: 03 اسفند 1404، تاریخ پذیرش: 03 اسفند 1404
چکیده
The occurrence of the cavitation phenomenon in hydraulic structures operating under high flow velocities remains a critical challenge. Efficient mitigation strategies may include increasing air concentration and optimizing the geometric design, such as minimizing sharp changes in flow direction and reducing local vortices. The Seymareh dam bottom outlet, operating under high water heads, is prone to cavitation due to its velocity and pressure fields. This study numerically investigates the effects of geometric modifications on cavitation risk reduction. Results showed that removing lateral expansion increases cavitation indices on outlet walls, while designing a concave curved bed elevates pressure and cavitation indices on the bed surface. Nonetheless, implementing both modifications together completely suppresses cavitation risk. The numerical analysis was conducted under single-phase flow conditions, without considering air entrainment, which, in practice, could further improve outlet safety. These findings could provide useful insights for geometric design approaches to control cavitation in high-velocity hydraulic structures.
کلیدواژه‌ها
Cavitation mitigation؛ Dam safety؛ Geometrical optimization؛ Numerical investigation؛ Flow3D

مراجع
[1] M. Zounemat-Kermani, T. Rajaee, A. Ramezani-Charmahineh, and J. F. Adamowski, “Estimating the aeration coefficient and air demand in bottom outlet outlets of dams using GEP and decision tree methods,” Flow Meas. Instrum., Vol. 54, pp. 9–19, (2016). [2] W. Wei and J. Deng, “Wedge aerator at the bottom outlet in flat tunnels,” J. Hydraul. Eng., Vol. 149, No. 1, Art. no. 04022037, (2022). [3] G. H. Chen, G. Y. Wang, C. L. Hu, B. Huang, and M. D. Zhang, “Observations and measurements on unsteady cavitating flows using a simultaneous sampling approach,” Exp. Fluids, Vol. 56, No. 2, Art. 32, (2015). [4] G. Wang, Q. Wu, and B. Huang, “Dynamics of cavitation–structure interaction,” Acta Mech. Sin., Vol. 33, No. 4, pp. 685–708, (2017). [5] V. V. Bhosekar, V. Jothiprakash, and P. B. Deolalikar, “Orifice spillway aerator: hydraulic design,” J. Hydraul. Eng., Vol. 138, No. 6, pp. 563–572, (2012). [6] A. Mohagheg and J. H. Wu, “Effects of hydraulic and geometric parameters on downstream cavity length of discharge tunnel service gate,” J. Hydrodyn., Vol. 21, No. 6, pp. 774–778, (2009). [7] Sh. Li, J. Zhang, X. Chen, G. Zhou, and J. Chen, “Characteristics of aeration of flow downstream of the radial gate with sudden fall-divergence aerator in discharge tunnel,” Water Supply, Vol. 1, No. 3, pp. 790–798, (2017). [8] G. Lei, H. Huang, X. Fan, J. Su, Q. Wang, X. Wang, and J. Zhang, “Influence of the transition section shape on the cavitation characteristics at the bottom outlet,” Water Supply, Vol. 23, No. 8, pp. 3061–3077, (2023). [9] A. H. Nikseresht, N. Talebbeydokhti, and H. Khorshidi, “Three-dimensional numerical modeling of cavitation and aeration system in dam outlets,” J. Fluids Eng., Vol. 134, No. 9, p. 091302, (2012). [10] S. Li, J. Zhang, X. Chen, J. Chen, and G. G. D. Zhou, “Cavity length downstream of a sudden fall-expansion aerator in chute,” Water Supply, Vol. 18, No. 6, pp. 2053–2062, (2018). [11] Ph. L. Thompson and R. T. Kilgore, Hydraulic design of energy dissipaters for culverts and channels, 3rd Edition, U.S. Department of Transportation, pp. 4–4, (2006). [12] W. H. Hager and R. M. Boes, “Hydraulic structures: a positive outlook into the future,” J. Hydraul. Res., Vol. 52, No. 4, pp. 299–310, (2014). [13] N. Wright and B. Tullis, “Prototype and laboratory low-level outlet air demand comparison for small-to-medium-sized embankment dams,” J. Irrig. Drain. Eng., Vol. 140, No. 6, pp. 0401–4013, (2014). [14] Z. Dong, L. Chen, and W. Ju, “Cavitation characteristics of high-velocity flow with and without aeration on the order of 50 m/s,” J. Hydrodyn., Vol. 19, No. 4, pp. 429–433, (2007). [15] F. Salazar, J. San-Mauro, M. Celigueta, and E. Onate, “Air demand estimation in bottom outlets with the particle finite element method,” Comput. Part. Mech., Vol. 4, No. 3, pp. 345–356, (2016). [16] M. Abdolahpour and R. Roshan, “Flow aeration after gate in bottom outlet tunnels,” Arabian J. Sci. Eng., Vol. 39, No. 5, pp. 3441–3448, (2014). [17] P. Ruan Shi, J. Wu, and W. Wu, “Hydraulic research of aerators on tunnel spillways,” J. Hydrodyn., Vol. 19, No. 3, pp. 330–334, (2005). [18] S. Li, J. Zhang, W. Xu, J. Chen, and Y. Peng, “Evolution of pressure and cavitation on side walls affected by lateral divergence angle and opening of radial gate,” J. Hydraul. Eng., Vol. 142, No. 7, p. 05016003, (2016). [19] T. Jamali, M. Manafpour, and H. Ebrahimnezhadian, “Evolution of pressure and cavitation in transition region walls for supercritical flow,” J. Water Supply Res. Technol., Vol. 72, No. 1, pp. 62–82, (2023). [20] Sh. Li, J. Zhang, W. L. Xu, J. Chen, Y. Peng, J. Li, and X. He, “Simulation and experiments of aerated flow in curve connective tunnel with high head and large discharge,” Int. J. Civ. Eng., Vol. 14, No. 1, pp. 23–33, (2016). [21] B. Dargahi, “Flow characteristics of bottom outlets with moving gates,” J. Hydraul. Res., Vol. 48, No. 4, pp. 476–482, (2010). [22] G. J. Li, G. Q. Dai, Y. Qing, and X. D. Ma, “Detached eddy simulation of hydraulic characteristics along the sidewall after a new arrangement scheme of the sudden lateral enlargement and the vertical drop,” J. Hydrodyn., Vol. 23, No. 5, pp. 669–675, (2011). [23] H. Sha, S. Wu, and Z. Chen, “3D numerical simulation for spillway tunnel,” Adv. Water Sci., Vol. 17, No. 4, pp. 507–511, (2006). [24] T. Jamali and M. Manafpour, “Investigation on cavitation occurrence potential in Seymareh Dam’s bottom outlet,” ISH J. Hydraul. Eng., Vol. 27, Suppl. 1, pp. 530–541, (2021). [25] T. J. Rovesht, M. Manafpour, and M. Lotfi, “Effects of flow condition and chute geometry on the shockwaves formed on chute spillway,” Water Supply Res. Technol., Vol. 71, No. 2, pp. 312–329, (2022). [26] J. H. Ferziger and M. Peric, Computational Methods for Fluid Dynamics, Springer, Berlin, Heidelberg, (2012). [27] J. M. Zhang, J. G. Chen, W. L. Xu, Y. R. Wang, and G. J. Li, “Three-dimensional numerical simulation of aerated flows downstream sudden fall aerator expansion in a tunnel,” J. Hydrodyn., Vol. 23, No. 1, pp. 71–80, (2011). [28] C. Hirt and B. Nichols, “Volume of fluid (VOF) method for the dynamics of free boundaries,” J. Comput. Phys., Vol. 39, pp. 201–225, (1981). [29] Mahab Ghodss Consulting Engineers, Seymareh Dam Project, available at: http://mahabghodss.net/ExternalSites/new/proj_seymareh.aspx. [30] SA. Tavakkol, A. R. Zarrati, and M. Khanpour, “Curvilinear smoothed particle hydrodynamics,” Int. J. Numer. Methods Fluids, Vol. 83, No. 2, pp. 115–131, (2016). [31] M. Pfister, W. H. Hager, and R. M. Boes, “Trajectories and air flow features of ski jump-generated jets,” J. Hydraul. Res., Vol. 52, No. 3, pp. 336–346, (2014). [32] H. Fuhrhop, H. E. Schulzh, and H. Wittenberg, “Solution for spillway chute aeration through bottom aerators,” Int. J. Comput. Methods Exp. Meas., Vol. 2, No. 3, pp. 298–312, (2014).
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Efficient approaches to reduce cavitation damage risk in the bottom outlet: Case study of Seymareh dam