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A Comparison between Performances of Turbulence Models on Simulation of Solitary Wave Breaking by WCSPH Method Original Article, D1 Mahmoudi A., Hakim zadeh H. and Ketabdari M .J Journal. Civil Eng. Urban. 4(1): 01-07. 2014 ABSTRACT:The modeling of Solitary wave breaking is an important subject in coastal and marine engineering, because the damage associated with tsunamis is related to their wave breaking and run-up on the shoreline. In this paper a space-averaged Navier–Stokes approach has been deployed to simulate the Solitary wave breaking on a plane slope. The developed model is based on the smoothed particle hydrodynamic (SPH) method which is a pure Lagrangian approach and can handle large deformations of the free surface with high accuracy. Since breaking waves are characterized by high distortion, the turbulence modeling has been of major concern in such simulations. For this study, the large eddy simulation (LES) model was chosen as the turbulence model to couple with the weakly compressible version of the smoothed particle hydrodynamics (WCSPH) method to simulate the Solitary wave breaking on a plane slope. In order to investigate the Effects of turbulence models on numerical simulations of wave breaking, the results of present study were compared with experimental results and numerical data found in the literatures. The results shown that turbulence modeling have a strong influence on the quality of the results. Furthermore, capability of the WCSPH method along with a LES approach to simulate the Solitary wave breaking on a plane slope was compared with result of ISPH method in the literatures. Finally, it is shown that the WCSPH coupled with LES model performs better than ISPH method. Keywords:WCSPH, solitary wave, Turbulence model, LES منبع: [Hidden Content] دانلود: [Hidden Content].,14-01-01-07.pdf J. Civil Eng. Urban.,14-01-01-07.pdf

Determination of Energy Dissipation in Stepped Spillways Using Finite Element and Finite Volume Methods Original Article, C24 Shoja F, Nikpour M.R, Sadeghi H. Journal. Civil Eng. Urban. 3(4):150-155. 2013 ABSTRACT:Accurate and suitable design of Spillways as major parts of dams is very important in the stability and safety of dams. In this study, flow over stepped spillway was simulated in 2D by solving poisson functions of stream and pressure in Finite Element method and with analyzing k-ε turbulence and volume of fluid models in Finite Volume technique. Also a comparison was done between the results of numerical models and measured values in order to investigate the accuracy of the models in calculation of energy dissipation. The relative error percent average of energy dissipation calculation using Finite Element and Finite Volume approaches was achieved 2.85% and 1.26%, respectively. Results showed Finite Volume approach could be employed slightly better than Finite Element method in modelling flow hydraulic over stepped spillway. Keywords: Finite Element, Finite Volume, Stepped Spillway, Turbulence Model, Volume of Fluid Model منبع: [Hidden Content] دانلود: [Hidden Content].,24-150-155.pdf J. Civil Eng. Urban.,24-150-155.pdf