Three-Dimensional Modeling of Pressure and Velocity Distribution in the Wide Edge Side Spillway Located in the Trapezoidal Channel

Zia Abidi

Zia Abidi

Keywords: Wide edge side spillway, (RNG) k−ε, CFD, VOF model

Abstract

The flow in side spillways is turbulent, exhibiting a completely three-dimensional pattern. Due to the complexity of the flow and the effects caused by the scale, physical models alone are insufficient to provide an understanding of the physical requirements governing such overflows. It is necessary to numerically describe this phenomenon, and laboratory studies should be conducted in conjunction with the numerical investigation. In this research, the side spillway of the rectangular wide edge located in the trapezoidal earthen channel with a lateral slope of 1:2 has been simulated in three dimensions using the CFD method with Fluent Ansys. For modelling, the perturbation model (RNG) k-ε and the VOF numerical model have been employed. The values of pressure and velocity have been calculated at different points of the overflow. The results reveal alternating speed and pressure changes in the overflow, leading to the creation of two rotating currents emanating from the main channel into the side spillway. Additionally, subsequent to the side spillway, a subsidiary channel is formed.

References

Aliparast, M. (2009). Two-dimensional finite volume method for dam-break flow simulation. International Journal of Sediment Research, 24(1), 99–107. https://doi.org/10.1016/S1001-6279(09)60019-6
Backhurst, J. R., & Harker, J. H. (2001). SECTION 3—Flow in Pipes and Channels. In J. R. Backhurst & J. H. Harker (Eds.), Chemical Engineering (pp. 19–59). Butterworth-Heinemann. https://doi.org/10.1016/B978-0-08-049422-7.50007-9
Chanson, H. (2004). 2—Fundamentals of open channel flows. In H. Chanson (Ed.), Environmental Hydraulics of Open Channel Flows (pp. 11–34). Butterworth-Heinemann. https://doi.org/10.1016/B978-075066165-2.50034-5
Jeon, J., Lee, J., Shin, D., & Park, H. (2009). Development of dam safety management system. Advances in Engineering Software, 40(8), 554–563. https://doi.org/10.1016/j.advengsoft.2008.10.009
Jin, C., Soltani, M., & An, X. (2005). Experimental and numerical study of cracking behavior of openings in concrete dams. Computers & Structures, 83(8), 525–535. https://doi.org/10.1016/j.compstruc.2004.11.002
Kamyab Moghaddam, A., Hamedi, A., & Amirahmadian, S. (2023). Experimental survey of static pressure in stepped chutes with inclined and horizontal steps equipped with end sills in nappe and skimming flow regimes. World Journal of Advanced Engineering Technology and Sciences, 8(2), 034–040. https://doi.org/10.30574/wjaets.2023.8.2.0069
Katopodes, N. D. (2019). Chapter 12—Volume of Fluid Method. In N. D. Katopodes (Ed.), Free-Surface Flow (pp. 766–802). Butterworth-Heinemann. https://doi.org/10.1016/B978-0-12-815485-4.00018-8
Kazemzadeh-Parsi, M. J. (2014). Numerical flow simulation in gated hydraulic structures using smoothed fixed grid finite element method. Applied Mathematics and Computation, 246, 447–459. https://doi.org/10.1016/j.amc.2014.08.016
Khismatullin, D., Renardy, Y., & Renardy, M. (2006). Development and implementation of VOF-PROST for 3D viscoelastic liquid–liquid simulations. Journal of Non-Newtonian Fluid Mechanics, 140(1), 120–131. https://doi.org/10.1016/j.jnnfm.2006.02.013
Löhner, R., Yang, C., & Oñate, E. (2006). On the simulation of flows with violent free surface motion. Computer Methods in Applied Mechanics and Engineering, 195(41), 5597–5620. https://doi.org/10.1016/j.cma.2005.11.010
Rai, R. K., Singh, V. P., & Upadhyay, A. (2017a). Chapter 7—Design of Irrigation Canals. In R. K. Rai, V. P. Singh, & A. Upadhyay (Eds.), Planning and Evaluation of Irrigation Projects (pp. 283–318). Academic Press. https://doi.org/10.1016/B978-0-12-811748-4.00007-8
Rai, R. K., Singh, V. P., & Upadhyay, A. (2017b). Chapter 8—Design of Canal Outlets and Their Calibration. In R. K. Rai, V. P. Singh, & A. Upadhyay (Eds.), Planning and Evaluation of Irrigation Projects (pp. 319–339). Academic Press. https://doi.org/10.1016/B978-0-12-811748-4.00008-X
Rubenstein, D. A., Yin, W., & Frame, M. D. (2015). Chapter 2—Fundamentals of Fluid Mechanics. In D. A. Rubenstein, W. Yin, & M. D. Frame (Eds.), Biofluid Mechanics (Second Edition) (pp. 15–62). Academic Press. https://doi.org/10.1016/B978-0-12-800944-4.00002-0
Twort, A. C., Ratnayaka, D. D., & Brandt, M. J. (Eds.). (2000). 10—Hydraulics. In Water Supply (5th ed.) (pp. 463–498). Butterworth-Heinemann. https://doi.org/10.1016/B978-034072018-9/50012-6
Yang, M., Qian, X., Zhang, Y., Sheng, J., & Shen, D. (2010). Assessing Alternatives for Sustainable Management of A Flood Control Dam. Procedia Environmental Sciences, 2, 98–110. https://doi.org/10.1016/j.proenv.2010.10.014