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Outlet boundary condition in interFoam

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Old   May 16, 2014, 09:36
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sandy
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Quote:
Originally Posted by vonboett View Post
Hi Sandy,

I made a quick test case with a cind of a "shower" domain like you have, only the inlet is a square box instead of a round plate. I used the settings of version 1 and as you can see (vectors are colored by alpha1) the stuff flows in at the top, through the coarse grid and leaves niceley at the bottom through the outlet. I guess there must be something else a problem. Again, this is done using at the outlet:
for the fluid (alpha1):

outlet
{
type inletOutlet;
inletValue uniform 0;
value uniform 0;
}
pressure p_rgh:
outlet
{
type totalPressure;
rho rho;
psi none;
gamma 1;
p0 uniform 1000.0;
value uniform 1000.0;
}
and U
outlet
{
type pressureInletOutletVelocity;
value uniform (0 0 0);
}

for an explanation of p_rgh see p_rgh in OF 1.7
Dear vonboett,
Thanks for your replay. In fact, I was running my case in the opposite way where I impose the inlet BC from the bottom at z=0 and flow should go out at the top where z=0.017 m. So when I shrink the domain length to half so less, liquid comes out smoothly not like when z=0.017. Any how the case now is working for the long domain when I swamped the BC upside down which I do not why???. If you have any explanation you can help me with because it is not logical... Could you please show me what was the inlet and walls BC you used for the case you ran and sent me?
best wishes,
Sandy,
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