Solution of Flow Field Equations to Investigate the Best Turbulent Model of Flow over a Standard Ogee Spillway in Finite Volume Method

Ogee spillways are the most important structures used to control floodwater, and built at the same time concrete or masonry dams are constructed. Due to such an importance, they shall be studied. The development of computer science and different types of computational fluid dynamic software, the behavior of ogee spillways can be studied in a short time and without paying high expenses. In this research, numerical evaluation and Fluent Software are used to study the impacts of different models of turbulence on the appropriate parameters of flow over ogee spillway. Based on Gauss-Seidel convergence condition, the step time of 0.01 second has been used for the convergence and control of equations. The results show that in case the RNG k – ε turbulence model is used, the accuracy of the results obtained from the flow over ogeespillway is increased. The percentage of relative error of the flow discharge over ogee spillway is 9.687 indicating that this method is of high accuracy. Whereas the decision criterion (P-value) of SPSS software is about 0.000006, and is very lower than 0.05, therefore it can be claimed that this numerical study is of high precision. The comparison between numerical model and the results obtained from Flow3D software and other numerical and laboratory methods indicates that this method is of high accuracy. Therefore, the use of numerical methods is recommended.

کلیدواژه ها:

Ogee Spillway ، Numerical Model ، Turbulent model ، P-value ، Validation