Abstract
The main aim of the study is to investigate and define the turbulent model to be applied while numerically modeling ogee spillway associated with flip bucket to dissipate the energy. A previous experimental investigation was replicated numerically by ANSYS FLUENT software, where four different methods to model turbulence: standard k-ε model (SKE), realizable k-ε model (RKE), renormalization group k-ε model (RNG) and detached eddy simulation model (either DES-KW or DES-RKE) were applied. Two different previous sets of experimental measurements of two different dams (Case A, Case B) were considered to reinforce the study's decision about a favorable model in simulating the experimental results. This research was initiated to assess their behavior by numerical turbulence models. At first, numerical simulation is carried out to the flip bucket (case A) to determine the model that provides reasonable results and contrasts them against experimental results. In this part of research, the simulations were conducted under three discharges (Q=0.22, 0.13 and 0.07m<sup>3</sup>). The previous experimental results and previous empirical derived equations were used to compare with the numerical simulation results. For Case A, the results show that RKE precisely described the jet trajectory length, at higher discharge and jet velocity values, while DES specifically designated the jet trajectory length generally but in relatively longer calculation duration. In addition, Case B, the results of the throw length are calculated for each model and compared with the measured length. This comparison showed that DES was the most reliable turbulent model. The outcome of this study agrees with the outcome of Part I study as both studies show that DES method is the most appropriate turbulent models to be used in studying flow over ogee spillway equipped with flip bucket energy dissipater. This simulation is very important in order to investigate the damages occurring at impingement location in other designs.
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