Multiphase CFD Problem

joolih · August 23, 2021, 18:00

Hello all!

I am having difficulty running simulations for my multi-material model.

(Please see attached photos)

Blue region is water.

White region is air.

Green mesh region is permeable PDMS.

Blue arrows are small negative pressure.

Red arrows are larger negative pressure.

So, there is an overall pressure gradient towards the bottom.

Air will permeate into the PDMS part, and water will enter into the hole, replace air, and fill in the hole over time.

I would like to see the water's flow-in velocity and predict filling time.

Is this something do-able with ANSYS Workbench Fluent?

I am stuck.. Can someone help??

Thank you!!!

LoGaL · August 23, 2021, 18:11

Split the geometry in two parts before meshing. The two parts should join at the entrance of the hole. Then you can ask fluent to calculate you the massflwo rate there

joolih · August 23, 2021, 18:14

Hello! Thank you for your response!
Do you mean split the green and blue parts? How do you do that?
And how do you make "The two parts should join at the entrance of the hole" happen?

Thank you so much!

LoGaL · August 24, 2021, 17:56

How are you creating the geometry??

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August 23, 2021, 18:11		#2
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	Split the geometry in two parts before meshing. The two parts should join at the entrance of the hole. Then you can ask fluent to calculate you the massflwo rate there

August 23, 2021, 18:14		#3
joolih New Member Join Date: Aug 2021 Posts: 4 Rep Power: 5	Hello! Thank you for your response! Do you mean split the green and blue parts? How do you do that? And how do you make "The two parts should join at the entrance of the hole" happen? Thank you so much!

August 24, 2021, 17:56		#4
LoGaL Senior Member Lorenzo Galieti Join Date: Mar 2018 Posts: 375 Rep Power: 12	How are you creating the geometry??