Numerical Investigation of Passed Flow Different Parameters over a Standard Ogee Spillway to Satisfy Flow Profile in CFD Method

One of the most important structures built at the same time of the construction of a dam is called spillway used to discharge surplus water exceeding the capacity of dam. Ogee spillway is one of the most efficient and famed ones, which is therefore liable to study. In this research, the impacts of different types of meshing on the proper calculation of flow parameters have been studied using numerical evaluation and Finite volume method. In case of using proper meshing, the results obtained from numerical method show considerably lower relative error in comparison with laboratory results. It seems that in case the meshing with 0.0065 m is used, around 66.7 percent of time and a considerable amount of price is saved. The percentage of relative error of the flow discharge over ogee spillway is 9.6871, which indicates that this method is highly precise. Whereas the decision criterion (P-value) of SPSS software is about 0.00002, and is very lower than 0.05, therefore it is proved that the numerical study is of high precision. The obtained numerical results have been compared with the results obtained from numerical, laboratory methods, and USBR and USACE diagrams and it was proved that they match appropriately. Therefore, the use of numerical model is strongly recommended.

Keywords:

Ogee Spillway , Finite volume method , Convergence Condition , Sensitivity Analysis , Meshing Dimension