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intensity in acoustic
Posted 6 nov. 2012, 03:34 UTC−5 Acoustics & Vibrations Version 3.5a 5 Replies
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Hi
when you start with COMSOL try to use only 1 physics at the time, test yourmodel physics by physics, once you have got the 3 fundamental physics working alone (with fixed values for the interconnections) then mix two and finally 3, else you will take long and get confused. It's certainyl quicker, I still apply it, 6 years after my first COMSOL model, and when I believe I'll manage without this ways, then I loose a day ;)
basically if you use frequency domain solver, all driving loads are amplitudes at the frequency given by the solver step(s). Try a few Model Library axamples, and check the webinars on acoustics on the web
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Good luck
Ivar
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Hi Ivar
thanks for your reply
I tried Model Library examples, I started COMSOL by use 1 physics then I added 2 other physics. I want to know can I change intensity in my models?
this is very important for me.
Hoping for help,thanks very much!
feri
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you can use values (numbers) in any field, but also equation and expressions, so you can define a variable entryy for the heat or temperture etc.
You might make your model nn linear though
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Good luck
Ivar
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I defined external Q in bioheat equation :
Q=alfa*P^2/rho*c
that P is acoustic pressure
on the other hand I=P^2/rho*c
I cant chang "I" because its dependend on p !
I dont know what you mean!
thanks
Feri
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I believe you need to explain a bit more, I probably misunderstood youre need
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Good luck
Ivar
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I want to simulate heat generation by ultrasound in tissue in different intensities and frequencies.
I mixed 3 physics for this purpose: acoustic pressure, piezo plane strain, bioheat equation.
is that true???
I have just a problem, I can't input my sightly intensity in this model!
thanks alot
Feri
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If you have the possibility to upgrade to Comsol 4.3a your problem will be much easier to solve (but I believe the same procedure can be used in 3.5a). Here you first solve your acoustics and piezo problem, say in the frequency domain using the predefined Piezo-Acoustic Interaction interface. Then you solve a bio-heat-transfer problem where your heat source Q = alfa*P^2/rho*c gets the pressure from the alreaddy solved acoustics model.
Best regards
Mads