Analysis and Simulation of Flow over Stepped Spillway Using Ansys-CFD

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Published: 2023-07-04

Page: 155-162


Nanna Sri Ramya

Department of Civil Engineering, College of Engineering (A), Osmania University, Hyderabad – 500 007, Telangana, India.

N. Suresh Kumar *

Department of Civil Engineering, College of Engineering (A), Osmania University, Hyderabad – 500 007, Telangana, India.

*Author to whom correspondence should be addressed.


Abstract

Water is one of the most precious commodities available in nature. Most of the rivers are not perennial and carry maximum flood discharge during the monsoon season every year. The earthen dam's crest may overtop during severe flood events. As a result, the structure's integrity is at risk and could fail catastrophically on the downstream side due to erosive flow conditions. Therefore, applying graded overlays to the earthen dams has become more popular to reduce erosion energy from overtopping the flows. A stepped spillway is considered mainly to safely pass the Maximum Flood Discharge (MFD) without causing overtopping on the existing embankment that is armored with Rolled Compacted Concrete (RCC). Hence, the present study was taken up with the objectives of estimating the selective hydraulic parameters of a stepped spillway and comparing these values with simulation results. A step height of 0.038 m and crest length of 50 m was considered for the energy dissipation at the constant d/s slope of 14o and discharges varying from 10 to 41 cumec. The numerical simulations were performed using CFD ANSYS software. A 2D geometry was created in Workbench Design Modeler with suitable boundary conditions. The k-ε turbulence model was employed for the present study. CFD ANSYS simulation results were interpreted using User Defined Function (UDF). The analytical computations were found to have good agreement with simulation results.

Keywords: Stepped spillway, energy dissipation, k-Epsilon, ANSYS-CFD


How to Cite

Ramya , N. S., & Kumar , N. S. (2023). Analysis and Simulation of Flow over Stepped Spillway Using Ansys-CFD. Asian Research Journal of Current Science, 5(1), 155–162. Retrieved from https://globalpresshub.com/index.php/ARJOCS/article/view/1824

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References

Sorensen RM. Stepped spillway hydraulic model investigation.Journal of Hydraulic Engineering, ASCE. 1985;111(12)1461-1472.

Hubert Chanson. Stepped spillway flows and air entrainment. Canadian Journal of Civil Engineering. 1993;(20):422-435.

Chanson H. Hydraulics of skimming flows over stepped spillways. Journal of Hydraulic Research, I. A. H. R, 1994(a);32(3):445-460.

Karim K. EL- Jumaily, Mariam Khudair Al- Lami. Study of Convenience of Using Stepped Spillway in Roller Compacted Concrete Dams (RCCD). Engineering & Technology Journal. 2009;27(16). DOI:10.30684/etj.27.16.7

SamanAbbasi, Amir Abbas Kamanbedast. Investigation of effect of changes in dimension and hydraulic of stepped spillways for maximization energy dissipation. World Applied Sciences Journal. 2012;18(2):261-267.

FarinazShoja, Mohammad Reza Nikpour, and HojjatSadeghi, ‘Determination of Energy Dissipation in Stepped Spillways Using Finite Element and Finite Volume Methods’, Journal of Civil Engineering and Urbanism. 2013;3(4):150-155.

Shaymaa AM, Al-Hashimi, Huda M. Madhloom, Thameen Nazar Nahi. Experimental and Numerical Simulation of Flow over Broad Crested Weir and Stepped Weir Using Different Turbulence Models’, Journal of Engineering and Sustainable Development. 2017;21(02):28-45.

Boes RM, Hager WH. Two-Phase Flow Characteristics of Stepped Spillways.’ Journal of Hydraulic Engineering, ASCE. 2003(a);129(9):661-670.

Anant I. Dhatrak, Sandip P. Tatewar, ‘Air Entrainment and Pressure Fields over Stepped Spillway in Skimming Flow Regime,' Journal of Power and Energy Engineering. 2014;(2):53-57.

BentalhaChakib, ‘Numerical computation of inception point location for flat-sloped stepped spillway. International Journal of Hydraulic Engineering. 2013;2(3):47-52. DOI: 10.5923/j.ijhe.20130203.03

Boes RM, Hager WH. Hydraulic Design of Stepped Spillways. Journal of Hydraulic Engineering, ASCE. 2003(b);129(9): 671-679.

Frizell KH. Hydraulics of stepped spillways for RCC dams and dam rehabilitations,' Roller Compacted Concrete III, US Bureau of Reclamation. 1992;PAP-596

Hongkoo Yeo, Joongu Kang, Sanghwa Jung. An Experimental Study for Construction of the Emergency Spillway in Daechung Dam. 2012;4(9):568-577. DOI:10.4236/eng.2012.49072

Horge Matos, Marti Sanchez, Antonio Quintela, Josep Dolz, ‘Characteristic depth and pressure profiles in skimming flow over stepped spillways. Journal of Hydraulic Engineering. 2000;235-241.

Hunt SL, Kadavy KC. Energy dissipation on flat sloped stepped spillways, Part1. Upstream of the Inception point. Trans. ASABE. 2010;53(1):103-109.

Hunt SL, Kadavy KC. Energy dissipation on flat sloped stepped spillways, Part2. Downstream of the inception point.’ Trans. ASABE. 2010;53(1):111-118.

Mohammad Rafi, Akhtar Ali, GhulamQadir, ‘Modeling the Mangla Dam Spillway for Cavitation and Aerators Optimization,' Journal of Water Resource and Protection. 2012;4:1051-1060.

OmidBozorg Haddad, MahsaMirmomenib, and Miguel A. Marino ‘Optimal design of stepped spillways using the HBMO algorithm,' Journal of Civil Engineering and Environmental Systems. 2010;27(1):81–94.

Prasanna SVSNDL, Suresh Kumar N. Simulation of Flows over an Air-Regulated Siphon Spillway. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-ISSN: 2278-1684, p-ISSN: 2320-334X, 2018, 15(4), PP 19-25.

Rajaratnam N. Skimming flow of stepped spillways.’ Journal of Hydraulic Engineering, ASCE, 1990;116(4):587-591.