Abstract
ABSTRACT Traditionally, reduced physical models are used to allow control, instrumentation and experimental evaluation of flow. More recently, computational fluid dynamics (CFD) has emerged as a tool that allows numerical modeling of flows and can complement the information provided by the physical model. The objective this paper is to validate the CFD tool in reproducing the flow through an ogee crest spillway with a roller bucket stilling basin. This validation was performed with the data from a reduced scale experiment in which measurements were made of the position of the water free surface and of the pressure loads in the spillway profile. It was verified that the CFD tool is suitable for the study of this type of flow, being able to reproduce the experimental results. In the execution of the numerical simulations, special attention was given to the influence of the mesh on the results. An important influence of the mesh was observed in some results, which shows the importance a sensitivity analysis of this parameter when performing CFD simulations. The obtained results offer the prospect of using CFD as a supporting tool for the design of spillways and stilling basins.
Highlights
In the design of hydraulic works the adequate dimensioning is fundamental to guarantee the correct operation and the safety of the structure
The Computational Fluid Dynamics (CFD) model is created in real scale (1:1), but the data set used to validate the model, for the first one, comes from the prototype instrumentation and for the second one, is based on the results obtained in reduced physical models and extrapolated by similarity criteria for the scale of the prototype
This study has attempted to validate the use of the CFD technics in the representation of a free surface flow crossing an ogee crest spillway and roller bucket stilling basin
Summary
In the design of hydraulic works the adequate dimensioning is fundamental to guarantee the correct operation and the safety of the structure. Due to the complexity of the flow, the use of reduced-scale physical models in hydraulic structure projects, besides being a traditional solution, is considered the most reliable method to reproduce complex hydraulic phenomena. The use of reduced physical models involves methodological simplifications as the neglect of the viscous forces of the flow (Motta, 1972). Numerical approaches using Computational Fluid Dynamics (CFD) have been successfully validated to simulate complex hydraulic phenomena by two main methodological approaches. The CFD model is created in real scale (1:1), but the data set used to validate the model, for the first one, comes from the prototype instrumentation and for the second one, is based on the results obtained in reduced physical models and extrapolated by similarity criteria for the scale of the prototype
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