The study on the use of porous coatings for stabilizing the flow and reducing noise from tandem cylinders at the Reynolds number of ReD=1.66 × 105 is presented in this paper. Threedimensional delayed detached eddy simulations (DDES) have been carried out for the modeling of the turbulent flow field, while a semi-empirical model has been used for modeling the porous medium, and the acoustic computations are perfomed using the Ffowcs Williams–Hawkings (FW-H) equation. Excellent agreement between the DDES and benchmark experimental results in literatures is obtained for the baseline flow. The effectiveness of porous coatings for reducing noise is clearly demonstrated again considering the three-dimensional effects. The spanwise correlation results have also provided some very interesting results regarding the noise generation mechanisms and the effects of porous coating on the turbulent structures in the area between the two cylinders. Results have shown the suppression of vortex shedding from the upstream cylinder and subsequently significant redcution of the turbulence impingment on the downstream cylinder. The tonal and broadband noise components are significantly reduced as the results of using the porous coatings. The results in this study confirm the capability of porous materials as a passive flow and aerodynamics noise control method for bluff-bodies.