Two-dimensional viscous-flow simulations for a circular cylinder in motion
Conference Paper
Overview
Additional Document Info
View All
Overview
abstract
The two-dimensional, viscous, unsteady, and incompressible flow by a circular cylinder in oscillatory motion is investigated by solving the Navier-Stokes equations. A CFD (Computational Fluid Dynamics) code based on a multi-block FDM/FVM hybrid method has been developed and extensively tested against other CFD and flow-visualization results. The multi-block hybrid method uses rectangular-grid-structured FDM (Finite Difference Method) at far field and body-fitted-coordinate-structured FVM (Finite Volume Method) in the near field. The FVM code is able to reproduce with high accuracy the flow characteristics around arbitrary 2D bodies for various experimental conditions. The FDM code used in the outer domain is developed so that it can include arbitrary rigid and free-surface boundaries. The numerical computations successfully captured many important flow features for various types of flow conditions. In particular, the flow simulations for an oscillating cylinder are able to reproduce, through advanced computer graphics software, various interesting features observed in the physical experiments for a variety of K-C numbers. The developed computer program is proved to be robust and efficient to be able to simulate more complicated flow problems including both seabed and free surface.
