BC for p_rgh In closed multiphase flow

eliastangen · November 7, 2024, 05:20

Hello!

I am running a 2D multiphase simulation with one water inlet and one air inlet, and one outlet. The pressure increase from inlet to outlet, which does not make sense. I think its related to the BC for p_rgh where I am using zeroGradient at the two inlets, and fixedValue unifrom 0 at the outlet. The pressure goes from -2700 to 0. I am using interFoam.

What should be the BC for p_rgh in closed multiphase simulations?

Thanks!

dlahaye · November 7, 2024, 05:53

No clue.

Do single outlet first?

eliastangen · November 7, 2024, 07:54

I think i found the solution. It was not related to the BC for inlet and outlet, but for the walls. When i applied fixedFluxPressure value uniform 0 at the wall for p_rgh, i got reasonable results.

dlahaye · November 7, 2024, 12:16

Not sure that fixing pressure on walls in a good idea.

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November 7, 2024, 05:53		#2
dlahaye Senior Member Domenico Lahaye Join Date: Dec 2013 Posts: 798 Blog Entries: 1 Rep Power: 17	No clue. Do single outlet first?

November 7, 2024, 07:54		#3
eliastangen New Member Elias Michelsen Tangen Join Date: Sep 2024 Posts: 4 Rep Power: 2	I think i found the solution. It was not related to the BC for inlet and outlet, but for the walls. When i applied fixedFluxPressure value uniform 0 at the wall for p_rgh, i got reasonable results.

November 7, 2024, 12:16		#4
dlahaye Senior Member Domenico Lahaye Join Date: Dec 2013 Posts: 798 Blog Entries: 1 Rep Power: 17	Not sure that fixing pressure on walls in a good idea.