[doubtsincfd]

In file createMesh.H, an instance 'mesh' of type 'fvMesh' is created

 Foam::fvMesh mesh
    (
        Foam::IOobject
        (
            Foam::fvMesh::defaultRegion,
            runTime.timeName(),
            runTime,
            Foam::IOobject::MUST_READ
        )
    );

Question 1: Is the following constructor from fvMesh.H used in the above case?

explicit fvMesh(const IOobject& io);

Question 2: In the above code, what does defaultRegion indicate?

I found following information about 'defaultRegion' in polyMesh.H and polyMesh.C

    //- Return the default region name
    static word defaultRegion;

namespace Foam
{
defineTypeNameAndDebug(polyMesh, 0);

word polyMesh::defaultRegion = "region0";
word polyMesh::meshSubDir = "polyMesh";
}

const Foam::fileName& Foam::polyMesh::dbDir() const
{
    if (objectRegistry::dbDir() == defaultRegion)
    {
        return parent().dbDir();
    }
    else
    {
        return objectRegistry::dbDir();
    }
}

Question 2 continued: What is region0 and why is it equal to 'defaultRegion' ?

[NightWing]

I too have the same doubt regarding createMesh.H

What does defaultRegion refer to?

Any suggestions?