Abstract
Purpose - The paper aims to study the influence of rounded corners on the flow-induced oscillation of a square cylinder that is free to oscillate in two degrees of freedom. Design/methodology/approach - The finite volume code in conjunction with the moving mesh scheme was implemented via a user-defined function to carry out the computations in two dimensions. The Reynolds number (Re) chosen for the present study is fixed at 100, and the frequency ratio, Fr = fs/fn (where fs is the vortex shedding frequency and fn is the natural frequency of cylinder) is used as a varying parameter. The computational model was validated for flow past a stationary cylinder with R/D = 0 and 0.5, and the results showed good agreement with the literature. Findings - The aerodynamic characteristics, amplitude response, trajectories of cylinder motion and vortex shedding modes are obtained by conducting a series of simulations under different frequency ratios of the cylinder. It was found that the minimum transverse amplitude, drag force and lift force obtained for a naturally oscillating square cylinder are quite different when compared with a stationary and forced oscillating cylinder, where the maximum drag and lift forces were observed for a square cylinder and a minimumaround R/D = 0.2 was observed. Originality/value - The present work identified the significant effect of the varying frequency ratio and R/D on the VIV modes of the cylinder. It was observed that the cylinder wake exhibits the (2S) vortex shedding mode for R/D = 0 to 0.2 at all Fr, whereas the C (2S)mode appeared for R/D > 0.2 at Fr = 1.1.
| Original language | English |
|---|---|
| Pages (from-to) | 2355-2374 |
| Number of pages | 20 |
| Journal | International Journal of Numerical Methods for Heat and Fluid Flow |
| Volume | 27 |
| Issue number | 10 |
| DOIs | |
| State | Published - 2017 |
Keywords
- Aerodynamic forces
- Cylinder response
- Freely oscillating cylinder
- Rounded corners