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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