Abstract
With an aim to predict the unsteady behavior of separated flows and the vortex structures around a building, DNS(Direct Numerical Simulation) and LES(Large Eddy Simulation) using the interpolation method that satisfies conservative properties in generalized coordinate system is applied to the comlex flows around a circular cylinder. Firstly, in order to clarify the accuracy of the interpolation method, it is shown that the computed aerodynamic quantities at low Reynolds numbers(Re) are in good agreement with the previous experimental results. Especially, we focus on flows around a circular cylinder at Re=200, 270 by DNS and investigate two different modes of 3D shedding in the cylinder wake transition. Secondly, the subgrid scale modeling for LES of turbulent flows is incorporated with the 3D numerical scheme using the interpolation method. Its applicability to the complex flows around a circular cylinder at Re=1,000 is discussed in detail.
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