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http://dx.doi.org/10.3795/KSME-B.2006.30.5.438

Simulation of Turbulent Flow Over Square Cylinder Using Lattice Boltzmann Method  

Kim Hyung-Min (경기대학교 기계시스템디자인공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.30, no.5, 2006 , pp. 438-445 More about this Journal
Abstract
We performed the simulation of the unsteady three dimensional flow over a square cylinder in a wind tunnel in moderate Reynolds number range, $100{\sim}2500$ by using LBM. SGS model was applied for the turbulent flow. Frist of all we compared LBM(Lattice Boltzmann Method) solution of Poiseuille flow applied Farout and bounce back boundary conditions with the analytical and FOAM solutions to verify the applicability of the boundary conditions. For LBM simulation the calculation domain was formed by structured grids and prescribed uniform velocity and density inlet and Farout boundary conditions were imposed on the in-out boundaries. Bounceback and wind tunnel boundary conditions were applied to the cylinder walls and the boundaries of calculation domain respectively. The maximum Strouhal number of the vortex shedding is 0.2025 at Re = 750. and the number maintains the constant value of 0.18 when Re>1000. We also predicted that the critical reynolds number of the turbulent flow is in the range of $250{\sim}500$.
Keywords
Lattice Boltzmann Method; Subgrid Scale Model; Vortex Shedding; Turbulent Flow; Incompressible Flow;
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