ENH: Adding functionality to scalarTransport FO and residence time tutorials for VOF

and single phase cases. Registration of the compressed flux in interFoam as it is
needed for the FO if used.

tutorials/multiphase/interFoam/RAS/angledDuct/0/s

@@ -0,0 +1,54 @@
+/*--------------------------------*- C++ -*----------------------------------*\
+| =========                 |                                                 |
+| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
+|  \\    /   O peration     | Version:  plus                                  |
+|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
+|    \\/     M anipulation  |                                                 |
+\*---------------------------------------------------------------------------*/
+FoamFile
+{
+    version     2.0;
+    format      ascii;
+    class       volScalarField;
+    location    "0";
+    object      s;
+}
+// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
+
+dimensions      [0 0 0 0 0 0 0];
+
+internalField   uniform 0;
+
+boundaryField
+{
+    front
+    {
+        type            zeroGradient;
+    }
+    back
+    {
+        type            zeroGradient;
+    }
+    walls
+    {
+        type            zeroGradient;
+    }
+    porosityWall
+    {
+        type            zeroGradient;
+    }
+    inlet
+    {
+        type            fixedValue;
+        value           uniform 0;
+    }
+    outlet
+    {
+        type            inletOutlet;
+        inletValue      uniform 0;
+        value           uniform 0;
+    }
+}
+
+
+// ************************************************************************* //