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Acoustic velocity
Posted 6 mars 2012, 21:13 UTC−5 2 Replies
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I am looking for a definition of acoustic velocity implemented in Comsol (Pressure acoustic/frequency domain - no flow). I want to make sure that what I am getting is exactly what I need. The Acoustic Module User Guide does not seem to have that definition. I really hope that it is defined as:
(u_ac)_i=[-1/(2*pi*f*rho)]*[dp/dx_i] with f being a frequency associated with a particular mode.
Can anybody help?
Thanks
Hello Oleksandr Barannyk
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Yes it is as you think it is (However make sure that you don't miss the imagery "i"). Which means that it is only valid in the inviscid case (which makes sense here).
You can look this up yourself: In the "Model Builder" top click on "Show" and there mark "Equation View".
Now you have the Equation View under "Pressure Acoustics" -> "Pressure Acoustics Model".
You can find all variable definitions there. In your example: acpr.vx = -(d(acpr.p_t,x)-acpr.qx)/(acpr.rho_c*acpr.iomega)
(and accordingly for acpr.vy and acpr.vz).
Hope this helps ...
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