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Simulating air injecting to water in a tank?

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Old   March 12, 2009, 14:17
Default Simulating air injecting to water in a tank?
  #1
Howard Wang
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Can any CFD code simulate air injects thru. a tube to water in a tank? I believe this is a problem of fluid interaction or fluid mixing, not multiphase flow.

Thanks, HW

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Old   March 12, 2009, 17:06
Default Re: Simulating air injecting to water in a tank?
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Hrvoje Jasak
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Have a look here - is this what you are after?

http://powerlab.fsb.hr/ped/kturbo/Op...pipeInTank.mpg

This is pretty straightforward 2-phase VOF stuff with a reasonably coarse mesh.

Hrv
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Old   March 12, 2009, 18:26
Default Re: Simulating air injecting to water in a tank?
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Howard Wang
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It is almost there. Additionally pressure loss in air injection may be interested for me.

Thank you very much, Hrvoje

HW
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Old   March 12, 2009, 19:08
Default Re: Simulating air injecting to water in a tank?
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Model
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your water level should rise right after the start of injection because of volume displacement. It does not seem your code is conserving liquid mass...
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Old   March 13, 2009, 03:10
Default Re: Simulating air injecting to water in a tank?
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Hrvoje Jasak
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The water level rises correctly - it's just that the tank has got a z-direction which is larger than what you see in the movie. The code is (of course) fully mass and momentum conservative - it would be quite difficult to write an FVM discretisation that does not conserve mass properly.

There is also a set of experimental comparison data for this case, if you are interested...

Hrv
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Old   March 13, 2009, 03:24
Default Re: Simulating air injecting to water in a tank?
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Hrvoje Jasak
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Let me guess: author with invalid E-mail address, using anonymous relay for posting. Please say Hello to Paul from me.

Hrv
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Old   March 13, 2009, 22:32
Default Re: Simulating air injecting to water in a tank?
  #7
Ahmed
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Fact No 1: A good number of readers of this forum are interested and willing to run OpenFoam on their computers.

Fact No 2: A good number of them cannot even install the programme not to mention run it, for different reasons.

I think there are more negative than positive opinions about OpenFoam.

I guess it would be wise to see why there are angry opinions.

Anyway, I wish not to read harsh sarcastic replies.

FYI

I was able to install and run the programme, but I am not able to finish the first tutorial, I can display the mesh but not the scalar pressure field neither the vectorial velocity field and I do not know why, is there something missing or wrong with my installation, or may be I am not following the correct procedure
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