Abstract
A numerical simulation is performed to investigate the vortex structure and force characteristics of a foil placed in the wake of a circular cylinder by solving the two-dimensional incompressible Navier–Stokes equations with a finite element method. The objective of this study is to reveal the vortex structures in the near region of the foil when the vortices shed from the circular cylinder are incident upon the foil, and to deal with the forces acting on the cylinder and the foil. Based on the relative position of the foil and the cylinder, three basic types of interference are classified; correspondingly, some basic patterns of vortex shedding are identified in the near region of the foil. According to our calculated results, it is found that a preferred vortex shedding frequency of the foil is synchronized with that of the cylinder due to the interference between the cylinder and the foil. Further, the influence of the relative position between the cylinder and foil and the incidence angle of the foil on the vortex formation, force character, and the frequency of the vortex shedding is analyzed and discussed.
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