Abstract
The flow field induced by a circular cylinder orbiting in a large vessel filled with fluid is investigated numerically. A finite-volume method is applied to the two-dimensional incompressible Navier–Stokes equations to compute the unsteady laminar flow fields. Moving reference systems are employed to allow an easy imposition of boundary conditions and to avoid grid deformation. Aspects of numerical accuracy related to the number of grid points and time steps employed are discussed. The flow is governed by two dimensionless parameters: a Reynolds number and a Keulegan–Carpenter number. These are varied systematically in order to find their influence on the flow pattern. In particular, the temporal development of the vorticity field and the lift on the cylinder are examined.
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