Defining two phases in a CLOSED system

HelplessWanderer · December 8, 2017, 12:11

Hello folks.

I want to simulate the dispersion of dust coming from a powder lying on the bottom of a test tube.

The system is closed: NO inlet and no outlet.

I defined phase 1 as air and phase 2 as alumina.

I divided the geometry of the powder into two parts: the 6 first milimeters of the test tube "PowderBed" and the rest of the test tube "RestTestTube".

I then went into "Cell Zone Conditions".

The problem is that if I define "phase 2" as the phase of "PowderBed", it automatically becomes also the phase of "RestTestTube".

In other words, regardless of what I do, in "Cell Zone Conditions", "PowderBed" and "RestTestTube" have always exactly the same features.

Is there anything I can do to make FLUENT understand that the region "PowderBed" is filled with alumina 'phase 2) whereas "RestTestTube" is filled with air?

I hope I've been clear enough. Many thanks for your answers.

annan · December 11, 2017, 05:23

Hey,
What models are you using ?
When you say that you divided the tube into two zones, have you done it using "Mark/Adapt Cells" => "Region" ... etc. ? if this is what you have done, you can try and use Patch in "solution initialization" to put the condition you want.
Hope this will do.

December 8, 2017, 12:11	Defining two phases in a CLOSED system	#1
HelplessWanderer New Member Marc Join Date: Apr 2015 Posts: 16 Rep Power: 11	Hello folks. I want to simulate the dispersion of dust coming from a powder lying on the bottom of a test tube. The system is closed: NO inlet and no outlet. I defined phase 1 as air and phase 2 as alumina. I divided the geometry of the powder into two parts: the 6 first milimeters of the test tube "PowderBed" and the rest of the test tube "RestTestTube". I then went into "Cell Zone Conditions". The problem is that if I define "phase 2" as the phase of "PowderBed", it automatically becomes also the phase of "RestTestTube". In other words, regardless of what I do, in "Cell Zone Conditions", "PowderBed" and "RestTestTube" have always exactly the same features. Is there anything I can do to make FLUENT understand that the region "PowderBed" is filled with alumina 'phase 2) whereas "RestTestTube" is filled with air? I hope I've been clear enough. Many thanks for your answers.

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December 11, 2017, 05:23		#2
annan Member annan Join Date: Nov 2016 Posts: 72 Rep Power: 10	Hey, What models are you using ? When you say that you divided the tube into two zones, have you done it using "Mark/Adapt Cells" => "Region" ... etc. ? if this is what you have done, you can try and use Patch in "solution initialization" to put the condition you want. Hope this will do.