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Forum: OpenFOAM Running, Solving & CFD November 18, 2015, 08:54
Replies: 28
Views: 7,181
Posted By Andrea_85
Try using inletOutlet for alpha with inletValue 0...

Try using inletOutlet for alpha with inletValue 0 (which is air in your case if i am not wrong) instead of zeroGradient to prevent water coming in from the top and bottom boundary and yes, in my...
Forum: OpenFOAM Running, Solving & CFD November 16, 2015, 09:44
Replies: 28
Views: 7,181
Posted By Andrea_85
Ok, now i see what is going on. Your channel is...

Ok, now i see what is going on.
Your channel is very small (R=2.5 micormeter) and capillary pressure is very large. If you don't provide a pressure force (between inlet and outlet) larger than the...
Forum: OpenFOAM Running, Solving & CFD November 16, 2015, 08:34
Replies: 28
Views: 7,181
Posted By Andrea_85
Can you show also the pressure field of those 2...

Can you show also the pressure field of those 2 pictures.
or alternatively, if you provide the test case i can give it a try.

andrea
Forum: OpenFOAM Running, Solving & CFD November 16, 2015, 03:39
Replies: 28
Views: 7,181
Posted By Andrea_85
Not sure i have understood well your problem. I...

Not sure i have understood well your problem. I don't think the 2 pictures are successive time-step since in the first one the water bubble is still far from the boundary. Try to put fixedvalue 0 at...
Forum: OpenFOAM Running, Solving & CFD November 13, 2015, 08:38
Replies: 28
Views: 7,181
Posted By Andrea_85
The tutorial "capillary rise" of interfoam uses...

The tutorial "capillary rise" of interfoam uses two pressure bc at inlet and outlet, flow is driven by hydrostatic pressure (and capillary forces) and it works fine. If you have only 1 phase at the...
Forum: OpenFOAM Running, Solving & CFD October 18, 2011, 08:37
Replies: 28
Views: 7,181
Posted By Andrea_85
Hi nima, honestly i'm trying different types of...

Hi nima,
honestly i'm trying different types of boundary condition to see what is the best choice to reproduce an experiment. In the experiment the flow is driven by a pressure difference between...
Forum: OpenFOAM Running, Solving & CFD October 18, 2011, 07:28
Replies: 28
Views: 7,181
Posted By Andrea_85
Hi again, I understand how to define a "inout"...

Hi again,
I understand how to define a "inout" cyclic patch between inlet and outlet. Now my question is which is the correct boundary condition for alpha1 in "inout"?
i have

0/U
inout
{...
Forum: OpenFOAM Running, Solving & CFD October 12, 2011, 03:52
Replies: 28
Views: 7,181
Posted By Andrea_85
Hi nima and thanks for reply. I never used fan...

Hi nima and thanks for reply.
I never used fan BC, can you be a bit more specific about how to use them for my case? or can you direct me to some reference or tutorial?

thanks again

andrea
Forum: OpenFOAM Running, Solving & CFD October 11, 2011, 06:45
Replies: 28
Views: 7,181
Posted By Andrea_85
Hi Nico, Have you found a solution? Have you...

Hi Nico,
Have you found a solution? Have you tried channelFoam? I need to specify a pressure gradient between the inlet and the outlet of my domain and i would like that the flow was driven by this...
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