[GerhardHolzinger]

I have a question to the following piece of code taken from interDyMFoam.C of OpenFOAM-2.2.x.

In the curly braces the variable Urel is declared and used inside the if-statement.

Where is Urel used in this solver?
It is neither passed to any method as an argument nor should it be accessible outside the block within the curly braces. So, of what use is Urel?

        scalar timeBeforeMeshUpdate = runTime.elapsedCpuTime();

        {
            // Calculate the relative velocity used to map the relative flux phi
            volVectorField Urel("Urel", U);

            if (mesh.moving())
            {
                Urel -= fvc::reconstruct(fvc::meshPhi(U));
            }

            // Do any mesh changes
            mesh.update();
        }

        if (mesh.changing())
        {