Achieving acoustic cloak by using compressible background flow

Zhang Ruo-Yang¹, Zhao Qing², Ge Mo-Lin^{1, 2, †,}

Sound rays in the acoustic cloaking system. The blue curves denote the sound rays, and the red curves denote wave fronts, where the background flow (the direction is emanative from the center) corresponds to Eq. (12) with n = 4.