Bubble Column by using TwoPhaseEulerFoam

sasakiken · November 19, 2021, 02:15

In 0/alpha.air, the inlet gas fraction is set to a fixed value of 0.5.
Is this value chosen independently from the other simulation parameters? Or is it related to some other constant, say U.air?

matejfor · November 30, 2021, 08:27

No sure what is your question, but I will try and please let me know if I hit it.

alpha.air is the concentration of the air on the inlet. The rest is the water as a carrying liquid to the air bubbles. U.air is a velocity at inlet. You do not need to multiply it by the alpha.air to get the bubble velocity.

November 19, 2021, 02:15	Bubble Column by using TwoPhaseEulerFoam	#1
sasakiken New Member shohei sasaki Join Date: Nov 2021 Posts: 1 Rep Power: 0	In 0/alpha.air, the inlet gas fraction is set to a fixed value of 0.5. Is this value chosen independently from the other simulation parameters? Or is it related to some other constant, say U.air?

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November 30, 2021, 08:27		#2
matejfor Senior Member matej forman Join Date: Mar 2009 Location: Brno, Czech Republic Posts: 182 Rep Power: 17	No sure what is your question, but I will try and please let me know if I hit it. alpha.air is the concentration of the air on the inlet. The rest is the water as a carrying liquid to the air bubbles. U.air is a velocity at inlet. You do not need to multiply it by the alpha.air to get the bubble velocity.