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Incident Pressure field vs Pressure Boundary Condition

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Hello fellow COMSOL users,

Does anyone know what is the difference between Incident Pressure field vs Pressure Boundary Condition in acoustic module in COMSOL ?
I want to model the classic problem of a tube and Helmholtz resonator and extract the frequency response of the system. Helmholtz resonator is placed in the middle of the tube and connected to its external surface. The model input is at the beginning of the tube and pressure is measured at another side of the tube.
There are two options available for a planar wave in COMSOL, 1- pressure boundary condition, 2- Incident pressure field ( in planar wave radiation boundary condition)
I have simulated both cases and the results are not the same.
Does any one know which boundary condition is the most suitable for my problem?

Any help will be really appreciated.
Thanks

0 Replies Last Post 24 feb 2017, 10:31 GMT-5
COMSOL Moderator

Hello Mehdi Jokar

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