twoPhaseEulerFoam flowRateInletVelocity relationship with alpha

Jasper Z · February 8, 2021, 21:33

Dear Foamers,

I am simulating a two phase jet in water, the inlet injects both air and water with alpha.air=alpha.water=0.5.

Both the water and air volumetric flow rates at the inlet are 5e-5 m3/s in the literature, I want to know do I need to specify the flow rate to be 5e-5 or 1e-4 when I use flowRateInletVelocity boundary at the inlet? Since I found that this boundary condition don't consider alpha value, it calculates the velocity by v=Q/A, which assumes the whole area is occupied by one phase. So I think I should set the flow rate=5e-5/alpha= 1e-4 to give the correct velocity, is that right?

Hope I explained clearly, thanks in advance!

Lil · February 24, 2021, 03:11

Hello,

I have the same question. Did you found any answer please?

February 8, 2021, 21:33	twoPhaseEulerFoam flowRateInletVelocity relationship with alpha	#1
Jasper Z Member Huan Zhang Join Date: Nov 2020 Posts: 55 Rep Power: 5	Dear Foamers, I am simulating a two phase jet in water, the inlet injects both air and water with alpha.air=alpha.water=0.5. Both the water and air volumetric flow rates at the inlet are 5e-5 m3/s in the literature, I want to know do I need to specify the flow rate to be 5e-5 or 1e-4 when I use flowRateInletVelocity boundary at the inlet? Since I found that this boundary condition don't consider alpha value, it calculates the velocity by v=Q/A, which assumes the whole area is occupied by one phase. So I think I should set the flow rate=5e-5/alpha= 1e-4 to give the correct velocity, is that right? Hope I explained clearly, thanks in advance!

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February 24, 2021, 03:11		#2
Lil New Member Lila Join Date: Nov 2019 Posts: 7 Rep Power: 6	Hello, I have the same question. Did you found any answer please?