The numerical analysis of the acoustic streaming effect of a cavity acoustic black hole

In this study, we use numerical methods to study the acoustic streaming effect of black hole (ABH). Firstly, build an ABH model effect. By deriving waves equations and solving Navier–Stokes equations, obtain flow field, sound temperature field under excitation. Secondly, simulation result reveals mechanism effects on transmission characteristics cavity ABH. The results show that abrupt decrease in pressure is caused by great changes velocity gradient catastrophe cross section. energy can also be dissipated thermal viscous layer at low frequencies. Finally, based medium ABH, propose feasible enhance insulation. Increasing section get a better insulation high frequencies, decreasing improve Sound Transmission Loss (STL). Through optimization, STL reach more than 25 dB