CFD Online Discussion Forums

CFD Online Discussion Forums (
-   OpenFOAM (
-   -   patch calculated inlet (

idrama November 15, 2010 15:36

patch calculated inlet
Hello Foamers,

can anybody explain the meaning of the patch calculated. Especially, in the interFoam tutorials (damBreak etc.) where the atmosphere patch is endowed with

type calculated;
value uniform 0;

Cheers in advance

herbert November 16, 2010 04:35

Hello Claus,

the calculated patch is the default type of a patch. It is not a boundary condition but it only holds the field values on the patch faces. This is why you aren't allowed to solve an equation for a field that has patch type calculated anywhere.

Normally, you find this patch inside fields that are derived from other variables. In your case I think it is from field p whereas the solver is only solving for pd! p is only provided for postprocessing etc.

Hope it helps,

idrama November 16, 2010 05:54

Ah, Okay! I think I have understood. Let me say it again in this way, the nut field, for instance, is not really solved by an equation, so it does not need BC's. However, I have to assign one, but the values on the respective patch are obtain from k-e-eq. In other word, I let OpenFOAM know that that nut at the values for the respective patch is obtain from a different source.

I understood, but I cannot yet explained! But I will.


idrama November 16, 2010 05:56

Another question: unfortunately, I ran a simulation where I assigned for a nut patch zeroGradient. Does it matters?

All times are GMT -4. The time now is 23:51.