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-   -   Difference between bubblefoam and twophaseeulerfoam (http://www.cfd-online.com/Forums/openfoam-solving/57775-difference-between-bubblefoam-twophaseeulerfoam.html)

ebaerow January 15, 2008 16:30

Hello, what is the differen
 
Hello,

what is the difference between those two? Both are based on H. Rusche, use Euler-Euler and k-epsilon.
I'm trying to solve a water flow with air being injected.
Although this might be an unsteady process is it possible to solve steady state (with one of these solver)?
Thanks!

Enrico

sek January 29, 2008 12:51

I was told that twoPhaseEulerF
 
I was told that twoPhaseEulerFoam has some additional models that allow granular flows. bubbleFoam came forst, and twoPhaseEulerFoam, an extended version came later.

ebaerow February 3, 2008 09:12

Thanks! So I thing both will
 
Thanks!
So I thing both will be suitable for my problem..

raagh77 March 14, 2009 07:55

Hi..Enrico Barow and others
 
Hi..Enrico Barow and others

my task is to simulate air particle being injected (at the center) to the water as continuous medium. (Becker case)

(Domain being simple 2D rectangular region sides and bottom (except at the center) being walls. Velocity inlet at the center and pressure outlet at the top)


Boundary conditions

1) alpha 0 gradients at the wall
2) inlet uniform 1
3) 3/4 th water (continous phase) filled so alpha being eual to 0 and remaining 1/4 air(discrete phase) and alpha being 1
4) alpha being 1 at the "top" where pressure outlet boundary conditions are set

top
{
type inletOutlet;
inletValue uniform 1;
value uniform 1;
}

5) at the inlet region alpha being 1

velocity-inlet
{
type fixedValue;
value uniform 1;
}

am using twoPhaseEulerFoam solver also I would like to know which could be the best solver when compare with bubbleFoam (turbulence being on)

Simulation errors:
When I try with these boundary conditions for alpha and with 0.9 m/s velocity at the inlet (air velocity) diameter of the particle being 0.00003 m

after few iterations courant number increase (around thousands!!) though the grid is not that fine also very small time step being employed.
Finally simulation crashes :-(


I want to know whether boundary conditions are to be altered or there I have to modify the solver and recompile again!!??

Awaiting for replies!

Regards
Raghavendra


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