Eulerian phase "screen" boundary condition

blacksoil2012 · January 23, 2013, 11:17

Hi,

I'm doing particles+water multiphase flow in Fluent using Eulerian approach. In reality, the outlet is with a screen; that is, only water comes out, but not the particles. When I set this to be "pressure-outlet" boundary, I can not find a way such that the particle phase will be prevented from going out at the screen. Does anyone know how to do this?

I am aware that if my particles are simulated as DPM, then it can have separate boundary condition different from that of the continuous phase.

Thank you very much!

blacksoil2012 · January 24, 2013, 16:36

Anybody had such experience? I assume when people were doing CFD that involves filters or screens, they may encounter this situation.

One thing that popped up was that in CFX, it offered "degassing" BC, while gas can escape from the domain while water is having a free surface. Although it's not the thing I wanted (separate BC for granular phase and primary liquid phase in an Eulerian multiphase simulation), at least it provided separate BC for different phases. Unfortunately, Fluent seems unable to provide the option of setting up different type of BC for different phases on a boundary.

bunny rabbit · January 29, 2013, 22:20

Why don't you apply porous jump condition to the outlet. It works. I am using it for the same purpose.

blacksoil2012 · January 30, 2013, 00:53

Quote:

Originally Posted by bunny rabbit

Why don't you apply porous jump condition to the outlet. It works. I am using it for the same purpose.

Thanks for your input. I see that "porous jump" boundary condition is only used for interior interfaces to simulate "screen" or "filter". Does that mean for my actual outlet boundary (which is actually a screen), I have to add extended computational domain to enclose that outlet so that I can apply porous jump BC on it?

Tensian · November 19, 2015, 10:51

Hi guys,

Have you make this works?

I need to enclose a solid phase. Water will enter and exit this zone, but solid particles are not allowed to exit the enclosure. Could you give me any advise?

I have tried to use porous jump, but it is not available with Euler granular approach. What do you suggest? Maybe a porous zone will work for this? Coould porous media be used in a multiphase Euler granular flow? I have volume fraction of 0.39 in the enclosure, so I guess is the right choice.

Any help will be really aprecciated.

Best

January 23, 2013, 11:17	Eulerian phase "screen" boundary condition	#1
blacksoil2012 New Member Join Date: Feb 2012 Posts: 13 Rep Power: 14	Hi, I'm doing particles+water multiphase flow in Fluent using Eulerian approach. In reality, the outlet is with a screen; that is, only water comes out, but not the particles. When I set this to be "pressure-outlet" boundary, I can not find a way such that the particle phase will be prevented from going out at the screen. Does anyone know how to do this? I am aware that if my particles are simulated as DPM, then it can have separate boundary condition different from that of the continuous phase. Thank you very much!

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January 24, 2013, 16:36		#2
blacksoil2012 New Member Join Date: Feb 2012 Posts: 13 Rep Power: 14	Anybody had such experience? I assume when people were doing CFD that involves filters or screens, they may encounter this situation. One thing that popped up was that in CFX, it offered "degassing" BC, while gas can escape from the domain while water is having a free surface. Although it's not the thing I wanted (separate BC for granular phase and primary liquid phase in an Eulerian multiphase simulation), at least it provided separate BC for different phases. Unfortunately, Fluent seems unable to provide the option of setting up different type of BC for different phases on a boundary.

January 29, 2013, 22:20		#3
bunny rabbit New Member Bhargavi.Bhaskara Join Date: Jan 2013 Posts: 1 Rep Power: 0	Why don't you apply porous jump condition to the outlet. It works. I am using it for the same purpose.

November 19, 2015, 10:51		#5
Tensian Senior Member James Join Date: May 2013 Posts: 116 Rep Power: 12	Hi guys, Have you make this works? I need to enclose a solid phase. Water will enter and exit this zone, but solid particles are not allowed to exit the enclosure. Could you give me any advise? I have tried to use porous jump, but it is not available with Euler granular approach. What do you suggest? Maybe a porous zone will work for this? Coould porous media be used in a multiphase Euler granular flow? I have volume fraction of 0.39 in the enclosure, so I guess is the right choice. Any help will be really aprecciated. Best