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Cavity volume as an input (rather than pressure)

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biofriendly

biofriendly

Bioengineer
Jul 19, 2009
13
Dear all,

I would like to model a closed cavity with incompressible hydrostatic fluid inside.

The cavity is deformed in the interaction between the internal fluid being which is increased in volume by adding new water (at a known rate) and the external elastic interactions. The pressure is being measured. I know how to model the problem using fluid elements, using *static, and cavity interaction, defining pressure as an input. However, I would like to have volume as a control parameter.

I looked around in the manuals but I havent found any straightforward so far. Any ideas guiding me to the right direction?

Thanks a lot in advance...

A
 
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There is an option to specify additional volume in a fluid cavity, maybe this could give you the form of control that you are looking for.
 
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Thanks. Any chance you would remember the keyword? I tried fluid expansion but that didnt work.
 
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This option can be specified using added volume parameter for *Fluid cavity keyword. So it should look like this:

*Fluid cavity, name=…, ref node=…, behavior=…, added volume=magnitude_of_additional_volume
…
 
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I see that it is still not supported in CAE (which is not a problem but why I missed it). so much. Helped a lot!
 
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One more question: I added the keyword. Nothing happens regardless of the value I assign to it. I removed the cavity pressure BC. Additionally, how can I assign to it an amplitude (added volume rate)?
 
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Check the documentation chapter "Analysis --> Analysis Techniques --> Special-Purpose Techniques --> Surface-based fluid modeling --> Fluid cavity definition", it describes these options in detail. However, amplitudes are not supported in this case.
 
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