Membrane stretching due to negative pressure in a "microfluidic" device

General discussion about Elmer
Post Reply
jeromiglopez
Posts: 7
Joined: 07 Mar 2020, 02:25
Antispam: Yes
Location: Mayagüez, Puerto Rico

Membrane stretching due to negative pressure in a "microfluidic" device

Post by jeromiglopez » 01 Jul 2020, 02:58

This is a repost from a discussion I started on Contributed Cases.

I am interested in simulating a membrane stretching due to collapsing channels in response to negative pressure. These channels are independent. The channel where the region of interest is located is in contact with a fluid.

It is an enclosed device with three channels, two channels to generate membrane deformation (the membrane is bound to the elastic body) and a middle channel with an inlet and outlet for continuous liquid flow.

The results will be published, hopefully.

I started working on the model in ElmerGUI.
Slide1.png
Slide1.png (135.15 KiB) Viewed 265 times

raback
Site Admin
Posts: 3704
Joined: 22 Aug 2009, 11:57
Antispam: Yes
Location: Espoo, Finland
Contact:

Re: Membrane stretching due to negative pressure in a "microfluidic" device

Post by raback » 01 Jul 2020, 11:35

Hi

If you know the pressure of the fluid domains there is no need to mesh them. Just apply "Normal Force" (same unit as for pressure) on the fluid walls.

-Peter

jeromiglopez
Posts: 7
Joined: 07 Mar 2020, 02:25
Antispam: Yes
Location: Mayagüez, Puerto Rico

Re: Membrane stretching due to negative pressure in a "microfluidic" device

Post by jeromiglopez » 02 Jul 2020, 18:45

Thanks for your suggestion Peter, I usually complicate things.

Can the negative pressure channels cycle on/off using a function?

raback
Site Admin
Posts: 3704
Joined: 22 Aug 2009, 11:57
Antispam: Yes
Location: Espoo, Finland
Contact:

Re: Membrane stretching due to negative pressure in a "microfluidic" device

Post by raback » 02 Jul 2020, 19:28

Sure, for example

Code: Select all

  $a=1.23
  $w=4.56
  Normal Force = Variable time
    Real MATC "a*sin(wt)"
-Peter

Post Reply