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modelling of membrane deformation and microvalves

Posted Jul 22, 2015, 8:15 a.m. EDT Microfluidics, Structural Mechanics Version 4.3 2 Replies

Jane Li
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Hi all,

I recently built a PDMS microvalves, which is constituted by a thin membrane layer on top and a thick semicircular microwell at the bottom. I want simulate the deformation of membrane under different pressure, and study when and under how much pressure will the membrane fully deformed and cause fully closure of the microwell.

There are two problems i have encountered. the first is about the visualization of the results. COMSOL always display the exaggerated deformation rather than the actual deformation calculated under different pressure, which won't allow me a straight display of the deformation level, and closure of microwell. the second is that when the membrane deforms, it is not taking the distance between the membrane and microwell as the maximum deform distance. even after I set the microwell surface as fix constraint, the deform results still shows the membrane deformed through the well bottom. Isn't this wired?

Did any of you work with anything similar? how did you cope with this problem?
2 Replies Last Post Jul 23, 2017, 4:41 a.m. EDT
COMSOL Moderator

Hello Jane Li

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Xiaotong Fu
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Posted: 8 years ago Feb 22, 2016, 4:12 p.m. EST
Hi Jane,

I'm working on a similar simulation right now and keep getting error from COMSOL. Which version were you using? Did you do 2D or 3D? Did you combine the solid mechanic module with other modules? I'm simulating the PDMS channel deformation under different pressure. Appreciate your help

Hi Jane, I'm working on a similar simulation right now and keep getting error from COMSOL. Which version were you using? Did you do 2D or 3D? Did you combine the solid mechanic module with other modules? I'm simulating the PDMS channel deformation under different pressure. Appreciate your help
Adil Mustafa
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Posted: 7 years ago Jul 23, 2017, 4:41 a.m. EDT
Hi Jane and Fu,

I'm also trying to simulate a similar scenario can you please guide me what modules did you guys use with solid mechanics i tried couple of them and used multi physics module to couple them but keep getting an error plus i'm using a 2d geometry.

Regards
Adil
Hi Jane and Fu, I'm also trying to simulate a similar scenario can you please guide me what modules did you guys use with solid mechanics i tried couple of them and used multi physics module to couple them but keep getting an error plus i'm using a 2d geometry. Regards Adil

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