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PML and acoustics

Posted Dec 16, 2020, 4:05 p.m. EST Acoustics & Vibrations 1 Reply

Olivier Guillaume
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Hello,

I want to simulate a chimney, open at the end and would like to determine the eigen modes of this kind of volume. Could I use an ending surface with an Impedance (Pressure acoustic, Frequency domain) and an absorbtion coefficient alpha = 1 or is it more accurate to use PML ?

All the best,

Olivier

1 Reply Last Post Dec 17, 2020, 11:15 a.m. EST
Dave Greve Certified Consultant
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Posted: 4 years ago Dec 17, 2020, 11:15 a.m. EST

Physically pressure waves will extend into the domain outside of the chimney. So you need a domain somewhat larger than the opening to approximate emission into an infinite space. You could try spherical, half-spherical, or a block.

A PML is probably best but termination in an impedance should be fairly similar. I'm not sure I understand what you need an absorption coeffient for.

Physically pressure waves will extend into the domain outside of the chimney. So you need a domain somewhat larger than the opening to approximate emission into an infinite space. You could try spherical, half-spherical, or a block. A PML is probably best but termination in an impedance should be fairly similar. I'm not sure I understand what you need an absorption coeffient for.

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