ENH: motionSmoother: allow certain tolerance when comparing coupled data

src/dynamicMesh/motionSmoother/motionSmoother.C

@@ -774,7 +774,8 @@ Foam::tmp<Foam::scalarField> Foam::motionSmoother::movePoints
             newPoints,
             minEqOp<point>(),           // combine op
             vector(GREAT,GREAT,GREAT),  // null
-            true                        // separation
+            true,                       // separation
+            1E-6*mesh_.bounds().mag()
         );
     }
 
@@ -925,7 +926,8 @@ bool Foam::motionSmoother::scaleMesh
                 totalDisplacement,
                 maxMagEqOp(),
                 vector::zero,   // null value
-                false           // separation
+                false,          // separation
+                1E-6*mesh_.bounds().mag()
             );
         }
 

src/dynamicMesh/motionSmoother/motionSmoother.H

@@ -208,7 +208,8 @@ class motionSmoother
             const Field<Type>&,
             const CombineOp& cop,
             const Type& zero,
-            const bool separation
+            const bool separation,
+            const scalar maxMag
         ) const;
 
         //- Assemble tensors for multi-patch constraints

src/dynamicMesh/motionSmoother/motionSmootherTemplates.C

@@ -293,6 +293,7 @@ void Foam::motionSmoother::testSyncField
     const CombineOp& cop,
     const Type& zero,
     const bool separation
+    const scalar maxMag
 ) const
 {
     if (debug)
@@ -315,6 +316,7 @@ void Foam::motionSmoother::testSyncField
     forAll(syncedFld, i)
     {
         if (syncedFld[i] != fld[i])
+        if (mag(syncedFld[i] - fld[i]) > maxMag)
         {
             FatalErrorIn
             (