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Expanding Volume within a Constant Volume

Posted Feb 16, 2011, 5:40 p.m. EST Fluid & Heat, Microfluidics, Geometry, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 3.5a, Version 4.0, Version 4.1 3 Replies

Jimmy Thai
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Hello,

I'd like to know if it's possible to create a balloon model in COMSOL in which there is one inlet but no outlet and the volume expands throughout the simulation. Overall, we are trying to model a balloon (medical device) being filled with a saline solution within a sphere with constant volume. The non-expanding sphere will be representative of a uterus.

What we are looking to find are:

a) The pressure gradient on the balloon model due to the saline solution.
b) The pressure gradient due to the exertion of forces from the inner expanding balloon over time on the outer spherical model's (uterus) wall.

Thanks for your time.
3 Replies Last Post Aug 9, 2011, 9:25 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 17, 2011, 1:09 a.m. EST
Hi

why not ? so long you do not try a "stationary" on a system without equilibrium I do not see what could go wrong.

You should adapt the settings to allow large deformations or hyper elasticity or whatever appropriate material conditions

My only comment use the latest v4 update it much more stable ;)

--
Good luck
Ivar
Hi why not ? so long you do not try a "stationary" on a system without equilibrium I do not see what could go wrong. You should adapt the settings to allow large deformations or hyper elasticity or whatever appropriate material conditions My only comment use the latest v4 update it much more stable ;) -- Good luck Ivar
Dario Rodrigues
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Posted: 1 decade ago Jul 25, 2011, 3:14 p.m. EDT
I have a similar problem, but with the bladder. You're able to model the balloon? Did you use the fluid structure interaction module? Or perhaps the laminar flow/solid mechanics/moving mesh?

Thank you so much!

Dario
I have a similar problem, but with the bladder. You're able to model the balloon? Did you use the fluid structure interaction module? Or perhaps the laminar flow/solid mechanics/moving mesh? Thank you so much! Dario
Jonathan Perez
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Posted: 1 decade ago Aug 9, 2011, 9:25 a.m. EDT
Dario,

In my experience with COMSOL, I think you will be able to model the expansion of the balloon. all you have to do is constrain your 3D model by holding it in one point so that the other portions of your geometry will have the freedom to move. That's what i did in my 3D simulation with the swelling of rice grain. i used diffusion and structural mechanics.

Jonathan
Dario, In my experience with COMSOL, I think you will be able to model the expansion of the balloon. all you have to do is constrain your 3D model by holding it in one point so that the other portions of your geometry will have the freedom to move. That's what i did in my 3D simulation with the swelling of rice grain. i used diffusion and structural mechanics. Jonathan

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