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COMSOL - Plane Wave Radiation input not matching Pressure Field

  1. Aug 12, 2014 #1
    I have a model set up, that is a cuboid, with a membrane half-way along - a bit like an impedance tube setup.

    I've used Integration 1 & 2 with Explicit 1 & 2 to define an 'inlet' and 'outlet' at opposing faces of the tube. The Variables for the inlet and outlet are intop1(p0) and intop2(p).

    I then added Plane Wave Radiation to the model (inlet & outlet), with the Incident Pressure Field on just the inlet set with a Pressure Amplitude p0 = 20 Pa.

    The resulting Acoustic Pressure at the 1st Eigenfrequency shows that the flow direction is correct, but the scale is odd. It shows that the pressure at the inlet is about 1x10^-11 Pa.

    How can this be, when I set the inlet pressure to be 20 Pa?

    Many thanks.

    https://dl.dropboxusercontent.com/u/11341635/Screen%20Shot%202014-08-12%20at%2008.35.20.png [Broken]
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Aug 28, 2014 #2
    I'm sorry you are not finding help at the moment. Is there any additional information you can share with us?
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