Control of flow-induced vibration of a circular cylinder with a porous splitter plate

The control of flow-induced vibration (FIV) of an elastically mounted cylinder (diameter D) with a porous splitter plate is numerically investigated at a Reynolds number of 150. In this study, a porous plate of different permeability (Da) and length (L) is proposed to control the vortex-induced vibration (VIV) and prevent galloping. It is found that the VIV response could be significantly suppressed by using the porous plate with Da <= 10-3 and L/ D >= 1.4 due to the extension of the shear layers from the upper and lower sides of the cylinder. As L increases, the porous plate shows better performance in VIV control. The galloping effect is observed for Da <= 10-4 and the solid plate. For higher permeability (Da >= 10-3), the pressure difference between the plate's upper and lower sides is weaker, and thus galloping is prevented. Da in the y-direction plays a more substantial role in both VIV and galloping control for a porous plate of anisotropic permeability. The results suggest that the porous plate can control VIV effectively, while preventing galloping from occurring.