Volume 3 Issue 2

Authors: Rasoul Daneshfaraz; Birol Kaya; Sina Sadeghfam; Hojjat Sadeghi

Abstract: In this study, a comparison of two discretization methods in the numerical modeling of the free surface flow over stepped and ogee spillways has been presented. FLUENT has been used for the numerical solution via Finite Volume Method (FVM), and for the Finite Element Method (FEM) ADINA has been used in literature. These two methods have been compared with experimental results of free surface flow over spillways. It is worth mentioning that k-ε model has been used for modeling the turbulence of flow. According to study results, an acceptable match has been observed between the two methods and experimental results. Nevertheless FVM has presented more acceptable results in some regions compared to FEM.

Keywords: Stepped and ogee spillways; Navier - Stokes Equations; FVM – FEM


Authors: Kamal edin ELsidig Bashar; Basim Hussein Khudair; Ghassn khalaf khalid

Abstract: Physically based modeling approach has been widely developed in recent years for the simulation of dam failure process due to the lack of field data. This paper provides and describes a physically-based model depending on dimensional analysis and hydraulic simulation methods for estimating the maximum water level and the wave propagation time from breaching of field test dams. The field physical model has been constructed in Dabbah city to represent the collapse of the Roseires dam in Sudan. Five cases of a dam failure were studied to simulate water flood conditions by changing initial water height in the reservoir (0.8, 1.0, 1.2, 1.4 and 1.5 m respectively).The physical model working under five cases, case 5 had the greatest influence of the water wave movement in the canal downstream. The results showed the collapse of the dam and the sides of the canal due to the high water levels recorded 277.001, 277.084 and 277.161 m Above Mean Sea Level (AMSL) at section 13 in the canal. The wave vanishing time was 70 minutes from the beginning of the failure at a distance of 590 m downstream. The dam collapse leads to cover the sides of the canal completely, especially at the distance of 371 m.

Keywords: Dam-Break; Physical Model Simulation; Roseires Dam