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How to set Acoustic Source

Posted Nov 4, 2009, 2:13 a.m. EST Version 3.5a 8 Replies

Oh Sue Ann
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Hi!

I have a question on the Acoustics module in Comsol, regarding how to set a monopole acoustic source.

I have a point acoustic source characterized by a modulated sin wave:

In Matlab coding,

y=-sin(2.*pi.*Freq.*Ts).*hanning(length(Ts))'

Here, the acoustic source is described in terms of particle displacement, y.

However, I understand that in Comsol, to set a point source, we are supposed to go to Physics > Point settings > Pressure acoustics, and select the type of source as flow, intensity and power.

My question is, how do we convert the description of the point source from displacement to a description in terms of either flow, intensity or power?

Thanks!
8 Replies Last Post Jul 31, 2014, 3:13 a.m. EDT
Bhargavaram Pachala
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Posted: 2 decades ago Nov 9, 2009, 4:48 p.m. EST
Hi I have same problem. Did you find any solution for that? Please let me know.

Thanks
Aram
Hi I have same problem. Did you find any solution for that? Please let me know. Thanks Aram
Kiran Sahu
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Posted: 1 decade ago Oct 14, 2010, 2:13 a.m. EDT
Hi,

I have the same problem as you had faced. Will you please tell me, how did you solve it ?

Thanks in advance,

Kiran
Hi, I have the same problem as you had faced. Will you please tell me, how did you solve it ? Thanks in advance, Kiran
Ying Peng
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Posted: 1 decade ago Jan 26, 2011, 6:06 p.m. EST

Hi!

I have a question on the Acoustics module in Comsol, regarding how to set a monopole acoustic source.

I have a point acoustic source characterized by a modulated sin wave:

In Matlab coding,

y=-sin(2.*pi.*Freq.*Ts).*hanning(length(Ts))'

Here, the acoustic source is described in terms of particle displacement, y.

However, I understand that in Comsol, to set a point source, we are supposed to go to Physics > Point settings > Pressure acoustics, and select the type of source as flow, intensity and power.

My question is, how do we convert the description of the point source from displacement to a description in terms of either flow, intensity or power?

Thanks!


Hi.

Have you figured out how to do yet? Thanks~
[QUOTE] Hi! I have a question on the Acoustics module in Comsol, regarding how to set a monopole acoustic source. I have a point acoustic source characterized by a modulated sin wave: In Matlab coding, y=-sin(2.*pi.*Freq.*Ts).*hanning(length(Ts))' Here, the acoustic source is described in terms of particle displacement, y. However, I understand that in Comsol, to set a point source, we are supposed to go to Physics > Point settings > Pressure acoustics, and select the type of source as flow, intensity and power. My question is, how do we convert the description of the point source from displacement to a description in terms of either flow, intensity or power? Thanks! [/QUOTE] Hi. Have you figured out how to do yet? Thanks~
Liu Antony
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Posted: 1 decade ago Jun 4, 2011, 10:54 p.m. EDT
i have the similar question for setting the dipole source
i have the similar question for setting the dipole source
Ying Peng
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Posted: 1 decade ago Sep 8, 2011, 5:24 p.m. EDT
Hi,

Have you figured out the problem yet?


Thanks
Hi, Have you figured out the problem yet? Thanks
Mads Herring Jensen COMSOL Employee

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Posted: 1 decade ago Sep 13, 2011, 4:54 a.m. EDT
Hi all

When entering a flow point source in the frequency domain, the source amplitude S has the dimension m^3/s. In order to set the "radial displacement" U0 of the source you can enter S = U0*acpr.iomega*4*pi.

Best regards
Mads

Hi all When entering a flow point source in the frequency domain, the source amplitude S has the dimension m^3/s. In order to set the "radial displacement" U0 of the source you can enter S = U0*acpr.iomega*4*pi. Best regards Mads
MOAAZ
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Posted: 1 decade ago Feb 4, 2012, 4:09 a.m. EST
I too have a problem in something related to the above discussion. If anyone can explain how COMSOL solves the point source problems. The documentation doesn't explain much..
I too have a problem in something related to the above discussion. If anyone can explain how COMSOL solves the point source problems. The documentation doesn't explain much..
Zb Wang
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Posted: 1 decade ago Jul 31, 2014, 3:13 a.m. EDT
Then how I can set Q in the monopole source whose dimension is 1/s^2 in 2D.
Then how I can set Q in the monopole source whose dimension is 1/s^2 in 2D.

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