ENH: cyclicPolyPatch.C: debug printing of area match

src/OpenFOAM/meshes/polyMesh/polyPatches/constraint/cyclic/cyclicPolyPatch.C

@@ -185,6 +185,9 @@ void Foam::cyclicPolyPatch::calcTransforms
         vectorField half0Normals(half0Areas.size());
         vectorField half1Normals(half1Areas.size());
 
+        scalar maxAreaDiff = -GREAT;
+        label maxAreaFacei = -1;
+
         forAll(half0, facei)
         {
             scalar magSf = mag(half0Areas[facei]);
@@ -199,13 +202,24 @@ void Foam::cyclicPolyPatch::calcTransforms
                 half0Normals[facei] = point(1, 0, 0);
                 half1Normals[facei] = half0Normals[facei];
             }
-            else if (mag(magSf - nbrMagSf)/avSf > coupledPolyPatch::matchTol)
+            else
+            {
+                scalar areaDiff = mag(magSf - nbrMagSf)/avSf;
+
+                if (areaDiff > maxAreaDiff)
+                {
+                    maxAreaDiff = areaDiff;
+                    maxAreaFacei = facei;
+                }
+
+                if (areaDiff > coupledPolyPatch::matchTol)
                 {
                     FatalErrorIn
                     (
                         "cyclicPolyPatch::calcTransforms()"
-                )   << "face " << facei << " area does not match neighbour by "
-                    << 100*mag(magSf - nbrMagSf)/avSf
+                    )   << "face " << facei
+                        << " area does not match neighbour by "
+                        << 100*areaDiff
                         << "% -- possible face ordering problem." << endl
                         << "patch:" << name()
                         << " my area:" << magSf
@@ -226,6 +240,18 @@ void Foam::cyclicPolyPatch::calcTransforms
                     half1Normals[facei] = half1Areas[facei] / nbrMagSf;
                 }
             }
+        }
+
+
+        // Print area match
+        if (debug)
+        {
+            Pout<< "cyclicPolyPatch::calcTransforms :"
+                << " Max area error:" << 100*maxAreaDiff << "% at face:"
+                << maxAreaFacei << " at:" << half0Ctrs[maxAreaFacei]
+                << " coupled face at:" << half1Ctrs[maxAreaFacei]
+                << endl;
+        }
 
 
         // Calculate transformation tensors
@@ -458,6 +484,9 @@ void Foam::cyclicPolyPatch::getCentresAndAnchors
                     << endl;
             }
 
+            // Note: getCentresAndAnchors gets called on the slave side
+            // so separationVector is owner-slave points.
+
             half0Ctrs -= separationVector_;
             anchors0 -= separationVector_;
             break;
@@ -833,6 +862,9 @@ void Foam::cyclicPolyPatch::transformPosition(pointField& l) const
     }
     else if (separated())
     {
+        // transformPosition gets called on the receiving side,
+        // separation gets calculated on the sending side so subtract.
+
         const vectorField& s = separation();
         if (s.size() == 1)
         {