Fig. 7: Comparison between geometries of the phase-averaged velocity contours.
From: On the relevance of facesheet orifice geometry to acoustic liner impedance
The vertical velocity is reported in the 1st and 2nd rows, while the horizontal velocity is shown in the 3rd and 4th rows. The inflow phase is shown in the 1st and 3rd rows, and the outflow in the 2nd and 4th rows. Results are plotted for a plane acoustic wave with an amplitude equal to 145 dB and a frequency of 1400 Hz.
