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Table 2

List of considered numerical parameters.

Variable Symbol Value
Interpolation order IO Linear and Quadratic
Location of input modes l IM Line from (x = 0, y = 0) to (0.085 m, 0)
Wall angle α 30° and 5°
Wall thickness r w rt/5 and rt/10
Elements per smallest wavelength N e 3.4, 6.5, and 12.1
Element shape ES Triangular and Quadrangular
Length of acoustic fluid behind lIM 0.906 m and 0.0 m
Duct length in the numerical simulations 0.396 m and 1.302 m
Length of acoustic fluid in front of duct lip 0.604 m
Length of acoustic fluid above the duct wall 0.906 m and 1.302 m

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