Objectives: The general objective of this project is to design a novel type of silencer that exploits the slow sound properties of Acoustic Black Holes (ABH) to develop both aeroacoustic and air purifying devices for sound attenuation and particle agglomeration. It has a high environmental impact as it contributes to global zero-emissions in transport and energy supply industries. As illustrated in Fig. 1, modellings (Finite element method - FEM, Lattice Boltzmann method - LBM) and measurements on ABHs have been developed [Bravo and Maury, 2023]. They showed that ABHs are able to fully dissipate incident energy over a broad frequency range by visco-thermal effect through the cavities. In other words, they do not transmit, nor reflect acoustic waves

Fig. 1. (left) Acoustic performance of open ABHs calculated by FEM (top) and LBM(bottom); 
(right) inner view of a 3D printed ABH (top) and simulated acoustical performance (bottom).