CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (http://www.cfd-online.com/Forums/openfoam-solving/)
-   -   Bubble_simulation (http://www.cfd-online.com/Forums/openfoam-solving/60278-bubble_simulation.html)

mer September 9, 2005 09:43

Hi, I want to simulate the mo
 
Hi,
I want to simulate the motion of a bubble rising in a cylindrical tube
with interfoam. any help for a begineer.
thanks.

brahim December 6, 2005 11:20

hi, look the twoPhaseEulerfo
 
hi,
look the twoPhaseEulerfoam case in the new version of Openfoam-1.2 or bubbleColumn case in old version OpenFoam-1.1.
enjoy,
brahim

alberto December 6, 2005 11:34

twoPhaseEulerFoam adopts a Eul
 
twoPhaseEulerFoam adopts a Euler-Euler approach, which is suitable if you want to simulate complex systems like a bubble column, with an high volume fraction of the dispersed phase.

If you need to simulate the motion of a single bubble studying, for example, its deformation, you should use a VOF model like (interFoam).

Alberto

mer December 7, 2005 06:32

Thank you for your response;
 
Thank you for your response;
yes, I want to test my simulation with the vof method. I try in past with another code that use vof method, than I would perform it with OpenFOAM.
I began my simulation with a modified interfoam case cited in the code, but I encountred a problem the PISO algorithm:
in results, no trace of gas phase, only liquid.
(In first time I've got an error with pdRefvalue and correct it)

any contribution ?!

aurelia March 22, 2006 05:09

Hi! I am trying to simulate a
 
Hi!
I am trying to simulate a rising bubble of air in water with interFoam.
I do not manage to create a nice initial bubble of air.
I set gamma to zero in a vitual sphere, ie I wrote something called setgamma which says "set gamma to zero if the coordinate of the centre of the cells of the internal mesh verify the equation of the sphere with centre C0 and rayon R"
the cells at the virtual interface of the sphere are set to 0, but I would like to set them to 0.5 for exemple, to have a smoother interface
the best would be to know which cells are cut by the sphere, and to know the volume of the cell in each side of the cutting plane
In doxygen, I found function that give the cell at a position, is there a fuction that gives the cells cutting by a surface?

well, perhaps am i all wrong

should I create a mesh for the bubble and use moving mesh instead?
Hrvoje, as your phd worked on rising bubble I thought you could give me some advice. Because of my lack of knowledge in his language, I don't understand what he is doing but it seems that the bubble has its own mesh, isn't it?

I tried to run InterFoam with the "uggly" bubble, just to see if it will rise, but it does not...
at least after 1 s (with delta T=1e-05)
someone with experience in this topic could give me some hint?

thanks!
Aurelia


All times are GMT -4. The time now is 08:36.