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-   -   Simulating air injecting to water in a tank? (http://www.cfd-online.com/Forums/main/16457-simulating-air-injecting-water-tank.html)

Howard Wang March 12, 2009 15:17

Simulating air injecting to water in a tank?
 
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


Hrvoje Jasak March 12, 2009 18:06

Re: Simulating air injecting to water in a tank?
 
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

Howard Wang March 12, 2009 19:26

Re: Simulating air injecting to water in a tank?
 
It is almost there. Additionally pressure loss in air injection may be interested for me.

Thank you very much, Hrvoje

HW

Model March 12, 2009 20:08

Re: Simulating air injecting to water in a tank?
 
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...

Hrvoje Jasak March 13, 2009 04:10

Re: Simulating air injecting to water in a tank?
 
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

Hrvoje Jasak March 13, 2009 04:24

Re: Simulating air injecting to water in a tank?
 
Let me guess: author with invalid E-mail address, using anonymous relay for posting. Please say Hello to Paul from me.

Hrv

Ahmed March 13, 2009 23:32

Re: Simulating air injecting to water in a tank?
 
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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