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

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Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, İnşaat Mühendisliği Bölümü, Türkiye

Tezin Onay Tarihi: 2014

Öğrenci: ERAY USTA

Eş Danışman: İSMAİL AYDIN, METE KÖKEN

Özet:

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.