[szamani]

Hi,
I have the following code:
surfaceScalarField interfacialSurface(fvc::interpolate(alpha1));
const labelUList& owner = mesh.owner();
const labelUList& neighbour = mesh.neighbour();

forAll(owner, facei)
{
const label own = owner[facei];
const label nbr = neighbour[facei];

if((alpha1.ref()[own] - 0.5)*(alpha1.ref()[nbr]-0.5) < 0.0){
interfacialSurface[facei]=1.0;
}
else{
interfacialSurface[facei]=0.0;
}



}

when I run the code in parallel, the shared faces between patches are not included in the loop above. I believe I need to write another for loop to include shared faces between patches.
My problem is that the owner and neighbours are not necessarily from the same patch, so how could I make the patches communicate the data between each other?
I appreciate any help