Experimental and Numerical Investigation of Flow Over Ogee Spillway
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Experimental and Numerical Investigation of Flow Over Ogee Spillway Öznur Kocaer 1 & Alpaslan Yarar 2 Received: 23 December 2019 / Accepted: 8 May 2020/ # Springer Nature B.V. 2020
Abstract
Ogee type spillway is one of the most preferred sluice types due to its functional suitability and high safety factor. It is used for controlling the flow rates and water levels in reservoirs, such as lowering the water level in emergency situations, maintaining normal river functions and discharging excess water. The main aim of this study is to investigate the flow over ogee type spillway by performing experiments in an open channel flume in the laboratory and simulating with numerical model. The numerical model having the same dimensions with the physical model is modeled with two different programs of ANSYS-Fluent and OpenFOAM. The flow depths of the models were measured at four points, H1, H2, H3, H4. In the numerical analysis, two different turbulence models, K-ε and K-ω SST turbulence model were used in order to investigate the accuracy of the turbulence models in the open channel. According to the results, R2 values, obtained from ANSYS- Fluent for the each measurement points where H1, H2, H3, H4, are 0.9776, 0.9859, 0.9701, 0.9916 and obtained from OpenFOAM for the each measurement points 0.9920, 0.9687, 0.9855, 0.9926 respectively. The findings show that the numerical tools have been sufficiently developed to simulate flow depths and water surface profiles. Keywords Ogee spillway . Open channel . Numerical modeling . Ansys-Fluent . OpenFoam
1 Introduction Spillways are defined as structures that pass the excess water coming to the reservoir from upstream to downstream. In the design process of spillways, in order to obtain hydraulically
* Alpaslan Yarar [email protected]
1
Bartın University, Faculty of Engineering, Architecture and Design, Civil Engineering Department, Bartın, Turkey
2
Konya Technical University, Faculty of Engineering and Natural Sciences, Civil Engineering Department, Konya, Turkey
Kocaer Ö., Yarar A.
and statically stability many different variations should be taken into consideration, such as the location of the water structure on the river and the location of the spillway in the water structure. In addition, because the spillways are structures that are used to discharge excess water from the dam, it must be strong enough as it endangers the dam safety if the water cannot be controlled. Experimental studies and supporting numerical studies are carried out on spillways as mistakes that may occur in spillways in any wrong design can cause large and irreversible results. Experimental studies and Computational Fluid Dynamics (CFD) studies have recently been seen as two supporting parts. In order to increase the reliability of the results, numerical modeling is also used besides experimental design. In order to provide the most accurate results of the numerical models, appropriate optimizations should be made and the appropriate turbulence model should be determined. Savage and Johnson (200
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