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Sommerfeld radiation condition in COMSOL
Posted 28 mars 2018, 22:55 UTC−4 Acoustics & Vibrations Version 5.3 1 Reply
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Hi, I've been trying to compare approximated Sommerfeld radiation condition and perfectly matched layer in COMSOL with "Pressure Acoustics, Frequency Domain" Physics. So I implemented Sommerfeld radiation condition by using "Impedance" node.
I know the Sommerfeld radiation condition has the form of
And it can be approximated as
on
Since the equation for "Impedance" node in Pressure Acoustics physics is like,
Therefore, letting I can implement the "Sommerfeld radiation condition"
In the result, however, the radiation condition is applied when the sign of the impedance is opposite. That is, .
Why this happened? Is the Sommerfeld radiation condition defined differently in COMSOL?