Numerical Modeling over a Labyrinth Side Weirs by Using Large Eddy Simulation method (LES)

In this study, three-dimensional flow around the labyrinth side weir was simulated by using a variety of Subgrid-Scale (SGS) models in LES method and four turbulence models based on RANS method with different computational grid size in ANSYS Fluent software. The simulation and experimental results were compared. The predicted flow discharge and water surface profile were validated using experimental data and the proper Subgrid-Scale (SGS) model in LES method was selected for hydrodynamic and parametric studies and were compared with the proper turbulence models based on RANS. All numerical values are very close to experimental values. Although the predicted water surface profile by turbulence models based on RANS method (K-ε-Standard model) was better than of LES Method, but the results of the hydraulic analysis showed that all Subgrid-Scale (SGS) models in the LES metod can be predicted the complex flow patterns and behaviors in more detail than turbulence models based on RANS method. As the result of flow discharge and water surface profile and also high relatively confidence in the ability of large Eddy Simulation method, the velocity, shear stress distribution and secondary flow channels with labyrinth side weir were investigated