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Eigenfrequncy with liquids
Posted 2 nov. 2012, 05:37 UTC−4 1 Reply
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Hy all
I try to solve the following problem: In a container will be full some liquid. On the top, i will have a flexible membrane as a lid. With a ring out of a hard material, i gonna then press from the top onto this membrane an get like this a deflection (because the liquid in the container is constant). Hopefully you can imagine what i mean ;-)
To find out the deflection was not a problem. I used the fluid-solid-interaction physics. But now i would find the eigenfrequencies of my system. Unfortunately i saw that there is no such application in this physics... What do you propose me to use? Is there any possibility to compute them with this physics? Or do i have to use another one? Is there another physics where i can implement a solid container with a liquid in it?
I am really new on COMSOL an therefore dont understand a lot about it.Thank u already now for helping.
Best regards
fabian
I try to solve the following problem: In a container will be full some liquid. On the top, i will have a flexible membrane as a lid. With a ring out of a hard material, i gonna then press from the top onto this membrane an get like this a deflection (because the liquid in the container is constant). Hopefully you can imagine what i mean ;-)
To find out the deflection was not a problem. I used the fluid-solid-interaction physics. But now i would find the eigenfrequencies of my system. Unfortunately i saw that there is no such application in this physics... What do you propose me to use? Is there any possibility to compute them with this physics? Or do i have to use another one? Is there another physics where i can implement a solid container with a liquid in it?
I am really new on COMSOL an therefore dont understand a lot about it.Thank u already now for helping.
Best regards
fabian
1 Reply Last Post 2 nov. 2012, 06:01 UTC−4
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Posted:
1 decade ago
Hi
this is a common problem, I see, unfortunately FSI is not set up for eigenfrequency or Frequency domain analysis, I believe that you need the acoustics module to provide the correct fluid load onto the membrane (but I do not have that module ;)
In a first approximation you could load your lower boundary with an additional mass, representing the fluid volume displaced but as you have a closed fluid volume it's more complex than that.
I would also appreciate to see some good models proposing such solutions ;)
--
Good luck
Ivar
this is a common problem, I see, unfortunately FSI is not set up for eigenfrequency or Frequency domain analysis, I believe that you need the acoustics module to provide the correct fluid load onto the membrane (but I do not have that module ;)
In a first approximation you could load your lower boundary with an additional mass, representing the fluid volume displaced but as you have a closed fluid volume it's more complex than that.
I would also appreciate to see some good models proposing such solutions ;)
--
Good luck
Ivar