Flow Over the Spillway of AlAdhiam Dam Under Gated Condition
Keywords:Ansys Fluent, Numerical CFD model, SST k-ω method, Gated condition, Spillway
The AlAdhaim Dam is located 133 kilometers northeast of Baghdad. It is a multipurpose dam and joints the Iraqi dam system in 2000. It has a storage capacity of 1.5 billion m3. The dam has an ogee spillway with a length of 562 m, a crest level of 131.5 m.a.m.s.l. and a maximum discharge capacity of 1150 m3/s at its maximum storage height of 143 m.a.m.s.l. This research aimed to investigate the hydrodynamics performance of the spillway and the stilling basin of AlAdhiam Dam by using numerical simulation models under gated situations. It was suggested to modify the dam capacity by increasing the dam's storage capacity by installing gates on the crest of the dam spillway. The FLUENT program was used to simulate the flow over the spillway. The free surface was calculated using the volume of fluid (VOF) method. To deal with turbulence, the SST k-ω turbulence model was used. The study showed that the spillway is capable of carrying the designed flood discharge and the modified conditions with negative pressure behind the gate and at some points along the spillway. Hydraulic jumps occur at various distances throughout the plunge pool depending on the incoming velocity in the flip bucket.
Article received: 4/6/2022
Article accepted: 2/8/2022
Article published: 1/11/2022
Almawla, A. S., Kamel, A. H., and Lateef, A. M., 2021. Modelling of Flow Patterns over Spillway with CFD (Case Study: Haditha Dam in Iraq), International Journal of Design & Nature and Eco dynamics, Vol. 16, No. 4, August, pp. 373-385, https://doi.org/10.18280/ijdne.160404 .
Alwan, I. A. and Azzubaidi, R. Z., 2021. A Computational Fluid Dynamics Investigation of using Large-Scale Geometric Roughness Elements in Open Channels, Journal of Engineering,27 (1), pp. 35-44.
ANSYS Fluent Theory Guide 19.0 Release.
AL-Sarefi, A. M. H. and Azzubaidi, R. Z., 2021. Investigations on the Impact of Using Elliptic Groynes on the Flow in Open Channels, Journal of Engineering, 27(2), pp. 44–58.
Daneshfaraz1, R., Joudi, A.R., Ghahramanzadeh, A., and Ghaderi, A., 2016. Investigation of Flow Pressure Distribution Over a Stepped Spillway, Advances and Applications in Fluid Mechanics, http://dx.doi.org/10.17654/FM019040805. Volume 19, Number 4, pp. 805-822.
Daneshkhah A. and Vosoughifar H., 2012. Solution of Flow Field Equations to Investigate the Best Turbulent Model of Flow over a Standard Ogee Spillway in Finite Volume Method, The First International Conference on Dams and Hydropower, Iran.
Engineering ToolBox, 2003. Roughness & Surface Coefficients. [online] Available at: https://www.engineeringtoolbox.com/surface-roughness-ventilation-ducts-d_209.html.
Hussain, H.H., Al Obaidy, A. I., Hommadi, A. H., Al Hudaib, Alaa T. Al Masoodi, Fouad H. Saeed and Nezar N. Al Saeedi, 2022. Modifying the spillway of Adhaim Dam, reducing flood impact, and saving water, Journal of Water Management Modeling, DOI: https://doi.org/10.14796/JWMM.C485.
Kumcu, S.Y., 2016. Investigation of Flow Over Spillway Modeling and Comparison between Experimental Data and CFD Analysis, KSCE Journal of Civil Engineering, 21(3): 994-1003, http://dx.doi.org/10.1007/s12205-016-1257-z.
Mohammed, J.R., Noori, B. M. A., and Hussein I. A., 2017. Modeling of The Hydraulic Performance of Ogee Spillway Using Computational Fluid Dynamics (CFD), Journal of University of Duhok, Vol. 20, No.1, Pp638-653,2017eISSN:2521-4861&PISSN:1812-7568.
Nichols B. D., and Hirt C. W., 1981. Volume of fluid (VOF) method for the dynamics of free boundaries, J. Comp. Phys., Vol. 39, pp. 201-225.
M. H. Zawawi, N. A. Aziz, M. R. M. Radzi, N. H. Hassan, M. Z. Ramli, N. M. Zahari1, M. A. Abbas, A. Saleha, A. Salwa, and Z. C. Muda, 2018. Computational Fluid Dynamic Analysis at Dam Spillway due to Different Gate Openings, American Institute of Physics, https://doi.org/10.1063/1.5066886.
Zhenwei, M., Zhiyan, Z. and Tao, Z., 2012. Numerical Simulation of 3-D Flow Field of Spillway based on VOF Method. 1877-7058. Published by Elsevier Ltd. https://doi.org/10.1016/j.proeng.2012.01.814.
How to Cite
This work is licensed under a Creative Commons Attribution 4.0 International License.