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-   -   inlet conditions for multiphase problems (http://www.cfd-online.com/Forums/openfoam-solving/90490-inlet-conditions-multiphase-problems.html)

of_user_ July 12, 2011 07:40

inlet conditions for multiphase problems
 
hi. i do have problems in a case concerning the inlet in a multiphase problem.

in my case, i have a droplet of phase2 sitting on a surface. on this surface i have a smaller patch with an inlet BC to inject more fluid of phase2 into the droplet. i simply edited the files 'alpha1' and 'U' this way:

Quote:

bottomInlet
{
type constantAlphaContactAngle;
theta0 105;
limit gradient;
value uniform 1;
}
Quote:

bottomInlet
{
type fixedValue;
value uniform (0 0 0.005);
}
and this works perfectly for a certain amount of time. but when the droplet is getting really large, the inlet is not inserting pure phase2 fluid anymore but a mixture of phase 1 and 2 instead.

does anybody know how to force the inlet to inject phase2 during the hole simulation time?

thank your for your help!

regards...



/edit:
it seems like this problem is just appearing for constantAlphaContactAngle. with dynamicAlphaContactAngle i do not have this phenomena.

ata July 13, 2011 05:06

inlet conditions for multiphase problems
 
Hi
Use constant pressure at the inlet instead of constant velocity.

of_user_ July 13, 2011 05:32

i will try that, thank you so far!


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