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Effect of a High Resolution Finite Volume Scheme with Unstructured Voronoi Mesh for Dam Break Simulation Original Article, D71 Jalalpour H. and Tabandeh SM. J. Civil Eng. Urban. 4(4): 474-479. 2014 ABSTRACT: In this paper, a high resolution finite volume method (FVM) is developed in order to discretization of multidimensional mathematical equations of Dam Break Phenomena using an unstructured Voronoi mesh grid for evaluating the effect of this type of mesh. Accordingly, the robust local Lax-Friedrichs (LLxF) scheme was used for the calculating of the numerical flux at cells interfaces. The model named FVDBC was run under the asymmetry partial and circular dam break conditions and then verified by comparing the model outputs with the documented results presented in the literature. A statistical analysis using SPSS statistical are performed to confirm the verification of the developed method. In addition, statistical observations indicated a good conformity between the FVDBC and analytical results clearly. The results of FVDBC code with voronoi mesh presented higher efficiency and precision than other meshes. Thus, it is better to use the voronoi mesh in numerical discrete equations because not only able to complicated geometries but also can give accurate results in lower computational effort. Due to a precise agreement between those output and documented results, the FVDBC could be considered as a reliable method for dealing with shallow water (SW) and shock problems, especially those having discontinuities. Keywords: Dam break, finite volume method, high resolution Local Lax–Friedrich scheme, Voronoi Mesh. منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(4)%20474-479,%202014.pdf J. Civil Eng. Urban., 4 (4) 474-479, 2014.pdf

Numerical Study of Unsteady Laminar Flow around a Circular Cylinder Original Article, B11 Keramati Farhoud R, Amiralaie S, Jabbari Gh, Amiralaie S. Journal. Civil Eng. Urban. 2(2): 63-67. 2012. ABSTRACT: In this paper, Numerical study of incompressible and unsteady flow around a circular cylinder with Reynolds number=150 has been studied at different alternative vortex times. Flow has been studied via solution of Navier-Stokes and continuity equations with using of finite volume method. Flow Parameters including drag and lift coefficient, Strouhal number, velocity contours, pressure contours, pressure coefficients and vorticity contours are calculated in this work and were compared with other numerical and experimental results that show good agreement. Results have shown that flow in entrance boundary after passing cylinder is completely unsteady in spite of steady flow and also results have shown changes periodically and have minimum value in symmetry line in the computational domain. Keywords: Unsteady flow- Finite Volume Method- Circular Cylinder- Strouhal number- Drag and Lift coefficient منبع: [Hidden Content] دانلود: [Hidden Content].,B11-63-67.pdf J. Civil Eng. Urban.,B11-63-67.pdf