[hfsf]

Hello, all.

Playing around with some tutorial examples in OF, i've stumped with some weird type of fixedValue boundary condition specification. Something like this:

exampleBC{
type fixedValue;
value $internalField
};

I've been searching in the guides for months, but never found anything about the $internalField operator. What is the meaning of it? And where can I find lectures about it?
Thanks in advance!!!

[Bernhard]

You can refer previously defined variables in OpenFOAM dictionaries.

In this case, you would have something like

internalField   uniform 0;

on top of your code. So the "uniform 0" is also used for this BC. Just consider it as a string that is copied to that location, there is nothing special under the hood.

[babakflame]

Hi hfsf

Although Bernhard reply was somehow sufficient and complete. I can add that for instance for pressure of the domain in free jets that exit to the non-confined environments; we can use this type of boundary condition.
The internal field value is 1e05 pa.

Regards
Bobi

[cfdopenfoam]

dear all.

i have a question for this $internalField boundary condition.

if the initial condition is defined as

internalField   nonuniform List<scalar> 
……
boundaryField
{
    outlet
    {
        type            fixedValue;
        value           $internalField;
    }
}

and this scalar field is changing with solution time,
will the boundary field value keep equal to the value in the patch-connected cell?

could someone plz give me some hints? thanks in advance!

/Karekle