patch calculated inlet

idrama · November 15, 2010, 14:36

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

atmosphere
{
type calculated;
value uniform 0;
}

Cheers in advance

herbert · November 16, 2010, 03:35

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,
Stefan

idrama · November 16, 2010, 04:54

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.

Cheers

idrama · November 16, 2010, 04:56

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

November 15, 2010, 14:36	patch calculated inlet	#1
idrama Senior Member Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 17	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 atmosphere { type calculated; value uniform 0; } Cheers in advance

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November 16, 2010, 03:35		#2
herbert Senior Member Stefan Herbert Join Date: Dec 2009 Location: Darmstadt, Germany Posts: 129 Rep Power: 17	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, Stefan

November 16, 2010, 04:54		#3
idrama Senior Member Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 17	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. Cheers

November 16, 2010, 04:56		#4
idrama Senior Member Claus Meister Join Date: Aug 2009 Location: Wiesbaden, Germany Posts: 241 Rep Power: 17	Another question: unfortunately, I ran a simulation where I assigned for a nut patch zeroGradient. Does it matters?