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perfect absorbtion no reflection of sound waves

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Hello folks!
im building a module using 2D pressure acoustic frequency domain. I've got stock at how to create a BOUNDARY which DO absorb the incident waves and DOES NOT reflect them. the boundary is internal. I don't think using PML will do the job because as I mentioned it should be boundary, also I need this boundary to act as a "real boundary" but not factious..right?
I also tried using interior impedance and it did not work maybe because the sound plane waves do not incident normal to the surface which is curved? I also tried sound soft boundary and no luck. I might missed something or there is another way to do it right? any feed back will be apreciated

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