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Acoustic Module: Plane wave radiation and sound soft boundary

Posted 08.09.2014, 07:45 GMT-4 Acoustics & Vibrations Version 4.4 1 Reply

Dr. Mohmmad Wajid Acoustic Signal Processing
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I would be thankful if you answer the following queries regarding acoustic module.
1. For a time dependent analysis in acoustic module, there is a boundary condition “Plane wave radiation” under pressure acoustic and Transient option. Does this boundary condition will avoid all reflection from the boundary; does will it absorb the entire wave incident upon the boundary, irrespective of the angle of incident?

2. Also, what is the significance of sound soft boundary? Does it will absorb the entire wave incident upon the boundary?
1 Reply Last Post 17.09.2015, 10:51 GMT-4
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Hello Dr. Mohmmad Wajid

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Thomas Graham
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Posted: 9 years ago 17.09.2015, 10:51 GMT-4
The sound soft boundary condition is where the pressure of the incident field drops to 0, at a short distance from the wall. In my experience it does reflect an incident wave, at an angle. The only way I've been able to successfully remove reflections interfering with my results is to use spherical PMLs around the source of my plane wave radiation. This PML will need to have a centre, which I designated as the centre of the sound soft material the wave was hitting. I have not done a great deal of investigating the angular dependence of the sound soft boundary condition, but I will investigate that now!
The sound soft boundary condition is where the pressure of the incident field drops to 0, at a short distance from the wall. In my experience it does reflect an incident wave, at an angle. The only way I've been able to successfully remove reflections interfering with my results is to use spherical PMLs around the source of my plane wave radiation. This PML will need to have a centre, which I designated as the centre of the sound soft material the wave was hitting. I have not done a great deal of investigating the angular dependence of the sound soft boundary condition, but I will investigate that now!

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