Dynamics of a Rotatable Cylinder with Splitter Plate in Uniform Flow

✍ Scribed by J.C. Xu; M. Sen; M. Gad-el-Hak

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 485 KB
• Volume: 7
• Category: Article
• ISSN: 0889-9746
• DOI: 10.1006/jfls.1993.1024

✦ Synopsis

This is a numerical study of the dynamics of a rotatable cylinder-splitter-plate body submerged in a uniform flow, with emphasis on fluid-structure interaction. The twodimensional, incompressible, unsteady Navier-Stokes equations expressed in terms of stream function and vorticity are solved by using a finite-difference method on a numerically generated, boundary-fitted, moving curvilinear coordinate system. The flow field is solved in conjunction with the rotational dynamics of the body. It is found that for subcritical Reynolds numbers, the splitter plate aligns itself in the flow direction. On increasing the Reynolds number, a symmetry-breaking bifurcation appears and the splitter plate migrates to a stable off-axis position. On further increasing the Reynolds number, there is a Hopf bifurcation after which the flow becomes unsteady and the body exhibits finite-amplitude oscillations. Various subharmonics become evident in the oscillation spectra at higher Reynolds numbers.