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From the same paper as the previous slide.
Figure 11 shows the second acoustic mesh that was used in the analysis, with the top half of fluid removed for clarity. The nominal element size at the wetted interface is set at 0.010 meters and increases in size to a nominal 0.030 meters at the outer fluid boundary.
Figure 12 provides the results of the acoustic tube validation corresponding to acoustic Mesh #2, which contains 463114 elements and 87745 pressure degrees of freedom.
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