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Acoutics Module

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I am trying to model a sound source (speaker, just a "power point source" now) in a sphere and prove that the sound is concetrated in the center of the sphere. Then I want to add sound treatment to the walls to get rid of that effect.

I just started using this program, so I am getting the following errors just trying to model the sphere and sound source.

Failed to evaluate operator.
-Operator: mean
-Geometry:1
-Boundary: 5,6,7,8,11,12,14,15
Mean operator requires an adjacent entity of higher dimension
Failed to evaluate expression
-Expression: mean(mod1.acsl.c_c)
Failed to evaluate variable
-Variable: mod1.acsl.ik
-Defined as: (mod1.ascl.iomega/mod1.acsl.c_c)

Please help! I need some ideas on where to start.

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