Experiments were conducted in a wind tunnel to study the wake vortex characteristics of two screen cylinders with porosities of 37% and 61% at a Reynolds number of about 7000. The results showed that the wake vortex formation mechanisms were completely different for these two cylinders. The screen cylinder with porosity = 37% resembles that of a bare cylinder and the wake is formed due to wake instability while that of β = 61% is formed due to shear-layer (Kelvin-Helmholtz) convective instability which involves merging through pairing and tripling of the small-scale vortices within the shear layers. These results are supported by the evolution of the peak frequency on the energy spectra in the streamwise direction.
|22nd Australasian Fluid Mechanics Conference, AFMC 2020
| 22nd Australasian Fluid Mechanics Conference
|7/12/20 → 10/12/20