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Unobserved explected plane wave symmetry

Posted 15.07.2014, 12:06 GMT-4 Acoustics & Vibrations Version 4.3 0 Replies

Alejo Alberti
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Hi everyone. I'm working on an very simple acoustics model in which a plane wave excites the space between two parallel walls. (1) First of all I couldn't find a way to impose a plane wave excitation which does not come from one of the extreme boundaries of the system. Could someone please give me a clue on this?

Now, since I wasn't able to figure that out I instead used a Background Pressure Field in the desired direction. Something weird came up: (2) if the incident field is parallel to the walls (x direction) then the total field is symmetric in the y direction, as expected, but not on the x direction. The results seem to point to a numerical error. If I insted use a field perpendicular to the walls, coming in the y direction, then the result is symmetric in the x direction, but not on the y.

I checked that when I impose a Background field one of its maximums is in the middle of the geometry, as desired, so the error does not come from that. I also used a symmetric mesh.

If anyone can give me some clues on either (1) or (2) of the issues I'd be very thankful.
'Till next time!
0 Replies Last Post 15.07.2014, 12:06 GMT-4
COMSOL Moderator

Hello Alejo Alberti

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