Numerical investigation of hydraulic characteristics of Laleli Dam spillway and comparison with physical model study

Download

index.pdf

Date

2014

Author

Usta, Eray

Metadata

Show full item record

Item Usage Stats

377
views

205
downloads

Spillway is a hydraulic structure that is used to pass big discharges in flood times in a controlled manner and release surplus water that cannot be safely stored in the reservoir to downstream. During the design process of the spillways, determining of hydraulic behavior of these structures is a very significant issue for an accurate and optimum design. In this thesis, the objective is to investigate the hydraulic characteristics of the flow over Laleli dam spillway numerically and compare the results with physical model. Flow over Laleli dam spillway was modeled numerically in three dimensions based on the Volume of Fluid (VOF) technique using Flow 3D which is widely used in flow analysis as a commercially available computational fluid dynamics (CFD) program. The model solved the Reynolds Averaged Navier-Stokes (RANS) equations with the Renormalized Group Equations (RNG) turbulence model on body independent orthogonal fixed grid. Appropriate grid selection, mesh refinement process, pressure distribution over the spillway, air entrainment effect, scale effect and cavitation potential over the spillway were investigated during this study. The results indicate that a three-dimensional numerical spillway model can be rapid and practical tool in order to predict the hydraulic parameters of the spillway flow.

Subject Keywords

Spillways., Cavitation., Hydrodynamics, Fluid Dynamics.

URI

http://etd.lib.metu.edu.tr/upload/12617305/index.pdf
https://hdl.handle.net/11511/23558

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Seismic Performance Evaluation of Concrete Gravity Dams by Using Pseudo Dynamic Testing and Simulations Aldemir, Alper; Binici, Barış (null; 2017-11-24) Dams are one of the mostimportantinfrastructure components servingfor water storage and energyproduction.Experimental studies on the seismic response of concrete gravity dams are scarce due to the complications regarding thelargescaleof dams and their interaction with the reservoir. This study presents the results of recent novel pseudo-dynamic dam tests (PSD) along with the nonlinear finite element simulations of the specimens. The test specimens were 1/75 scaled version of the highest ...
Modeling and Experimental Study of Newtonian Fluid Flow in Annulus SORGUN, Mehmet; Ozbayoglu, M. Evren; Aydın, İsmail (2010-09-01) A major concern in drilling operations is the proper determination of frictional pressure loss in order to select a mud pump and avoid any serious problems. In this study, a mechanistic model is proposed for predicting the frictional pressure losses of light drilling fluid, which can be used for concentric annuli. The experimental data that were available in the literature and conducted at the Middle East Technical University-Petroleum Engineering (METU-PETE) flow loop as well as computational fluid dynamic...
Design of settling basins and related problems encountered in practice Zaloğlu, Fatma Deniz; Göğüş, Mustafa; Department of Civil Engineering (2013) Settling basins are the hydraulic structures used to get sediment-free water from rivers mostly for hydropower systems. Mainly fine sediment is trapped along the settling basins and from time to time the accumulated sediment in the settling basin is flushed away. A wrong design of a settling basin creates lots of problems. In this study based on the hydraulic analysis of a settling basin, the available settling basin design procedures in the literature were reviewed. Some of the settling basins constructed ...
Application of volume of fluid (VOF) method in conjunction with shear stress transport (SST) k-ω turbulence closure model to investigate spillway flow Bayrakdar, Fatih; Tokyay Sinha, Talia Ekin; Department of Civil Engineering (2017) Hydraulic engineers often require to assess the reasons and consequences of interaction of flow with structures. Computational Fluid Dynamics (CFD) became a useful tool in this regard in recent years as it provides ample amount of information both on flow and its interaction with its surrounding. To this end, flows over a spillway are investigated. The computational domain for the flow over a spillway is based on the study by Dargahi (2006). Numerical results are compared to previous experimental ones. In t...
Numerical simulation of free surface flows at fish passages / Özkaya, Kerem; Köken, Mete; Department of Civil Engineering (2014) Hydroelectric dams build on the rivers block most of the flow section and leaves no space for the migrating fish along the rivers. Fish passages are built along the river at those locations to overcome this problem. Understanding the hydrodynamics inside these structures is essential in the design process. Parameters like discharge, velocity, acceleration and turbulence inside the fish passage can be obtained using three dimensional numerical simulations. Change in these parameters is investigated for diffe...

Citation Formats

E. Usta, “Numerical investigation of hydraulic characteristics of Laleli Dam spillway and comparison with physical model study,” M.S. - Master of Science, Middle East Technical University, 2014.