Abstract
This paper conducts simulations to analyze the flow control characteristics of cylindrical flow over porous plates in the subcritical regime, utilising large-eddy simulation (LES) coupled with the Ffowcs Williams-Hawkings (FW-H) method. Three Reynolds numbers (Re) were studied (3900, 4.7 × 104, and 1.4 × 105) with two configurations: bare cylinder and porous plate attached cylinder (PPAC). The research findings suggest that, at Re of 1.4 × 105, PPAC showed significant reductions in drag (28.45%) and lift fluctuation (97.53%). The drag reduction effect is nearly four times higher than that observed at Re of 3900. The porous plate filters out high-frequency irregular oscillations in the wake flow. At high Res, the dominance of high-frequency modes in the wake of a bare cylinder, along with a smaller recirculation region, enhances the control effectiveness of PPAC. The dominant mode of the Kármán vortex street reappearing in the far wake region is enhanced. Aeroacoustic analysis reveals that, due to the superior noise suppression effect of the PPAC across the full frequency range, particularly within the 102–103 frequency range, on average, the noise surrounding the cylinder experiences a reduction of 27.85 dB, and it exhibits more uniform directionality at Re of 1.4 × 105.
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