Abstract
In this report, the factors that are responsible for the accuracy of numerical caclcuratins of two-dimensional low Reynolds number flows around cylindrical bodies immersed in a uniform stream on the basis of Navier-Stokes equations are descussed. The finite difference calculations have been carried out for a circular cylinder and it has been confirmed that the differnnce of the outer boundary conditioin affects little on the accuracy, if the outer boundary is sufficently far from the body, but if a comparatively near outer boundary is assumed, Oseen flow is recommended as the outer flow on the boundary. The results can be extended to the other geometries of cylinders and Imai's asymptotic solution can be avilable in place of the Oseen flow. Some aspects of the flow, such as streamlines, length of twin-vortices, angle of flow separation, etc. are also descussed.
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