STEPS NUMBER EFFECT ON HYDRAULIC PARAMETERS OF FLOWS IN STEPPED SPILLWAYS
Spillways are one of the most important parts of dams. There are several types of spillways, but they all play the same role. The flow through these structures is quite complicated hydraulically. The main focus of this study is the free surface flow in stepped spillways. Thus, the objective is to determine the influence of the steps number on the hydraulic parameters of the flow through this type of spillway. Taking into account the complexity of the equations of motion governing the flow through these structures, the use of Ansys-Fluent software was chosen in order to carry out the desired numerical models. It is to be noticed that this software is based on the finite volume method. The basic equations of the phenomenon treated are those of an incompressible fluid given by Navier-Stokes, while for modelling the turbulence the k-ε equations were used. The VOF model coupled with Level-Set was also used in order to take into account the biphasic flow characteristics. The influence of the steps number on the energy dissipation, on the water level, and also on the shear stresses acting on the walls was analyzed.
ANSYS-FLUENT Inc. (2016), Ansys-Fluent 17.2 user guid, USA.
BENTALHA, C., HABI, M. (2017). Numerical simulation of water flow along stepped spillways with non uniform step heights, Larhyss Journal, Issue 31, pp. 115-129.
CHANSON, H. (1994). Comparison of energy dissipation between nappe skimming flow regimes on stepped chutes, Journal of Hydraulic Research, Vol. 32, Issue 2, pp. 213-218.
CHASSAING, P. (2000). Turbulence en mécanique des fluides : Analyse du phénomène en vue de sa modélisation à l’usage des ingénieurs, Edition Cépaduès, Collection Polytech de l’I.N.P de Toulouse, France, 625 pages.
CHINNARASRI, C, WONGWISES, S. (2006). Flow patterns and energy dissipation over various stepped chutes, Journal of irrigation and drainage engineering, Vol. 132, Issue 1. pp. 70-76.
JAHAD, U.A., AL-AMERY, R., DAS, S. (2016). Energy dissipation and geometry effects over stepped spillways, International Journal of Civil Engineering and Technology, Vol. 7, Issue 4, pp. 188-198.
KOSITGITTIWONG D.D., CHINNARASRI C., JULIEN P.Y. (2012). Two phase flow over stepped and smooth spillways, Ovidius University Annals Series : Civil Engineering, Issue 14, pp. 147-154.
LEBDIRI, F., HAMANI, S., SEGHIR, A. (2017). Simulation numérique des écoulements à surface libre dans les canaux lisses et à marches d’escalier (Numerical simulation of free surface flows in smooth and stepped channels), Le Journal de l’Eau et de l’Environnement (LJEE), ENSH, Issue 30-31, pp. 16-23.
LEBDIRI, F., SEGHIR, A., BERREKSI, A. (2018). Simulation numérique des écoulements turbulents à surface libre : Application aux coursiers d’évacuateurs de crues (Numerical simulation of free surface turbulent flows: Application to Spillway chutes), Journal International Sciences et Technique de l’Eau et de l’Environnement, Vol. III, Issue 1, ISNN: 1737-9350, ISSN: 1737-6688.
LEBDIRI, F., SEGHIR, A., BERREKSI, A. (2019). Finite Element and Finite Volume Method for simulation of free surface flows: Application to Spillways (April 2, 2019), 2nd National Conference on Computational Fluid Dynamics & Technology 2018 (CFD & Tech 2018).
Available at SSRN: https://ssrn.com/abstract=3373179
MERROUCHE, D. (2010). Application des méthodes de suivi d’interface à la simulation numérique des écoulements diphasiques gaz-liquide. Thèse de Doctorat, Université de Boumerdes, Algérie, 168 pages.
MUSAVI-JAHROMI H., BINA, M., SALMASI, F. (2008). Physical and numerical modeling of the nappe flow in stepped spillways, Journal of Applied Sciences, Vol. 8, Issue 9, pp. 1720-1725.
RASSAEI M., RAHBAR S. (2014). Numerical flow model stepped spillways in order to maximize energy dissipation using fluent software, IOSR Journal of Engineering (IOSRJEN), Vol. 4, Issue 6, pp. 17-25.
SORENSEN, R. (1985). Stepped spillway hydraulic model investigation, Journal of Hydraulic Engineering, Vol. 111, Issue 12, pp.1461-1472.
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