[toro-boro]

Hi, I am a beginner in OpenFoam modelling, so I have a simple question about boundary conditions.
As I know in chtMultiRegionSimpleFoam we can define boundary conditions for U,p,T etc in an each region with ChangeDictionaryDict files.
But we should use files "U","p","T" in "0" folder, like in tutorial "heatTransfer\chtMultiRegionFoam\multiRegionHeater "
And there are boundary fields in these files, what is the sense of in? Is it different conditions? Or maybe it's default conditions for all regions, that are replaced after reading ChangeDictionaryDict

Thank you very much!


Details from tutorial:

"U" file in "0" folder

FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [0 1 -1 0 0 0 0];

internalField uniform (0.01 0 0);

boundaryField
{
".*"
{
type calculated;
value uniform (0.01 0 0);
}
}

U bounary conditions from system/bottomWater/changeDictionaryDict

U
{
internalField uniform (0.001 0 0);

boundaryField
{
minX
{
type fixedValue;
value uniform (0.001 0 0);
}

maxX
{
type inletOutlet;
inletValue uniform (0 0 0);
}

".*"
{
type fixedValue;
value uniform (0 0 0);
}
}
}