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Acoustic plane radiation boundary conditions equation reference.
Posted 29.06.2012, 11:09 GMT-4 Acoustics & Vibrations, Parameters, Variables, & Functions Version 4.2 0 Replies
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I applied an acoustic plane wave radiation boundary condition to my model in a frequency domain study.
However, when I look at the equations, I could not understand why in the frequency domain study, the plane wave equation is defined as a second order equation with the Laplace operator. (as the attached file)
I can understand the first-order radiation boundary conditions in the frequency domain they use comes from the momentum conservation.
But why they used the second-order equation in the frequency domain study, and how does it come from?
I've read the reference paper they cited, however, I would appreciate if someone can give me more explanations, hints or some other reference sources.
Comsol 4.2 equation reference :
Acoustics Module Users Guide/ Pressure Acoustics Branch/ The Pressure Acoustics Interface/ Plane, Spherical, and Cylindrical Radiation Boundary Conditions .
Thanks a lot in advance.
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Hello Jen-Hsuan Ho
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