Multiphase with permeability to air and not to Water

JS1970 · November 14, 2019, 12:50

Dear OpenFoamers,

I've started recently to work with OpenFoam and was going quite well, but then I found a problem which I can't find the right answer:

- It's a case of multiphase with water and air. It's a transient situation, where water enters the inlet, and has several outlets, but some of them block the exit of water, since they are a physical barrier, but are permeable to air.

- Is there a way to define an outlet where only air can exit, but not water?

I've looked around and could not find such a situation defined. The standard BC that I found define several cases but nothing similar with this.

May be someone has a good suggestion.

Thank you.

lavdwall · August 26, 2020, 07:48

Did you find a solution to this problem?

JS1970 · August 27, 2020, 15:23

Unfortunately not until now. I found that more people needs that and found other places but nobody did answer it really.

The only possible solution I could find mentioned was to use swak4foam and write some equation which changes with "alpha", but I´m not sure how to do it and it will really work.

November 14, 2019, 12:50	Multiphase with permeability to air and not to Water	#1
JS1970 New Member Join Date: Nov 2019 Location: São Paulo, BRazil Posts: 4 Rep Power: 6	Dear OpenFoamers, I've started recently to work with OpenFoam and was going quite well, but then I found a problem which I can't find the right answer: - It's a case of multiphase with water and air. It's a transient situation, where water enters the inlet, and has several outlets, but some of them block the exit of water, since they are a physical barrier, but are permeable to air. - Is there a way to define an outlet where only air can exit, but not water? I've looked around and could not find such a situation defined. The standard BC that I found define several cases but nothing similar with this. May be someone has a good suggestion. Thank you.

August 26, 2020, 07:48		#2
lavdwall New Member Laurien Vandewalle Join Date: Jun 2013 Location: Ghent, Belgium Posts: 29 Rep Power: 12	Did you find a solution to this problem?

August 27, 2020, 15:23		#3
JS1970 New Member Join Date: Nov 2019 Location: São Paulo, BRazil Posts: 4 Rep Power: 6	Unfortunately not until now. I found that more people needs that and found other places but nobody did answer it really. The only possible solution I could find mentioned was to use swak4foam and write some equation which changes with "alpha", but I´m not sure how to do it and it will really work.