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Moving membrane with FSI

Posted May 7, 2012, 11:25 a.m. EDT MEMS & Nanotechnology, MEMS & Piezoelectric Devices, Microfluidics, Studies & Solvers Version 4.2 2 Replies

Frank Jakobs
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Hi all,
I've got a problem simulating my developed sensor. In principle it is this:
A membrane covers a cell filled with liquid, for example water. On the membrane there is a kind of bumper. A force acts on this bumper in the direction of the cell. What I expect is this:
Because of the flexibility of the membrane it will bend in the water. The water should be incompressible and therefore need to move somewhere. All walls of the cell are fixed and undeformable, thus the only deformation option is again the membrane. Also the membrane gets "down" in the middle, where the force acts and goes "up" circular around this point so that the volume stays constant.
However I cannot teach COMSOL to do the right simulation. I've tried it with the solid mechanics physics. The membrane goes down where the force acts, but the volume is compressed respectively it does't go up in the same amount around the middle.

I hope you understand what I mean, and that someone is able to give me a hint on solving this problem.

Attached is the model as it is

Kind regards

Frank
2 Replies Last Post Jul 12, 2012, 9:58 a.m. EDT
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Hello Frank Jakobs

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Mychal Smith
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Posted: 1 decade ago Jun 22, 2012, 1:54 p.m. EDT
I'm doing something similar. I am simulating a micropump. The top layer of material is PDMS, which has a load applied that corresponds to 10 psi. The right and left boundaries are constrained so that they cannot move. The middle layer is water, and the bottom layer is steel, which is constrained by all 4 boundaries. The idea is when the PDMS is deflected using a time varying load, the water flow is suppose to be affected. However, I cant get the moving layer of PDMS and the water to simulate at the same time during the animation.

Did you ever get you model to simulate right?

Any ideas of how to get them to work together and show at the same time?

Thanks
I'm doing something similar. I am simulating a micropump. The top layer of material is PDMS, which has a load applied that corresponds to 10 psi. The right and left boundaries are constrained so that they cannot move. The middle layer is water, and the bottom layer is steel, which is constrained by all 4 boundaries. The idea is when the PDMS is deflected using a time varying load, the water flow is suppose to be affected. However, I cant get the moving layer of PDMS and the water to simulate at the same time during the animation. Did you ever get you model to simulate right? Any ideas of how to get them to work together and show at the same time? Thanks
Frank Jakobs
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Posted: 1 decade ago Jul 12, 2012, 9:58 a.m. EDT
Hi,

no i didn't get it to work properly.
Hi, no i didn't get it to work properly.

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