Abstract
In this study, the results of CFD obtained by using Fluent with respect to the air entrainment at spillway aerators are compared to the data of the physical model study and the results of some empirical equations presented by other investigators. The air entrainment rates obtained from the CFD analyses are in reasonable good agreement with the values calculated by the empirical equations. However, the CFD results are better than the physical model data including considerable scale effects. The numerical verification procedure in this study is based on the ASME editorial policy statement, which provides a framework for computational fluid dynamics uncertainty analysis. So, the validation of the CFD model was discussed in this scope.
Highlights
The development of spillway aerators has been pioneered to a very large extent through the use of physical hydraulic models
The aim of this paper is to present a verification of the Computational Fluid Dynamics (CFD) models related to the air entrainment in a spillway aerator, because the using of CFD model is encouraged in the large hydraulic structures
The numerical verification procedure in this study is based on the ASME editorial policy statement, which provides a framework for computational fluid dynamics uncertainty analysis [5]
Summary
The development of spillway aerators has been pioneered to a very large extent through the use of physical hydraulic models. Most hydraulic structures models are designed and operated according to Froude law of similarity, with viscous and surface tension forces as represented by Reynolds and Weber numbers respectively. With air entrainment, the latter two forces are very significant and their poor model representation often results in poor scaling of model results compared to prototype experience. The aim of this paper is to present a verification of the CFD models related to the air entrainment in a spillway aerator, because the using of CFD model is encouraged in the large hydraulic structures In this respect, the CFD model which simulates the experimental model studied by Demiroz [2] was prepared and performed. The numerical analysis results by means of FLUNET software were verified by acceptable method based on the generalized Richardson Extrapolation and the ASME editorial policy statement
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