Acoustic Boundary

Clayton

How can an infinite boundary condition be applied to the larger "room" in which the object under test is immersed?  I believe that if no explicit boundaries are defined, all surfaces act like they are perfectly hard (reflecting).  I tried defining the exterior "room" boundaries as pressure = 0, but that still yields a bunch of room modes which make it tough to see the behavior of the object.  Thanks in advance!

Victor

There's no infinite boundary condition. You can model the room itself with a large coarse mesh. That's what's done in the organ pipe tutorial in the Tutorials manual. You'll still get room modes, but their frequencies will be much lower than the smaller object's modes and clearly distinguishable by the mode shapes. If they look too similar, make the room bigger.