Abstract
We apply the direct finite difference technique of the incompressible Navier-Stokes equations to unsteady flows around a rectangular cylinder and a circular cylinder as typical building and structure shapes. For high Reynolds number flows, the third-order upwind scheme is employed for the convection terms without turbulence modelling. Through a comparison with previous experimental data, the validity of the present method is confirmed. Two- and three-dimensional unsteady flows with separation around a cylinder are simulated under the same numerical conditions. Two-dimensional structures in the wake are concluded to result in peculiar aerodynamics, and three-dimensional computation of wake flows is significant even for the two-dimensional problems concerned with a cylinder-type structure.
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