[FEM] Elmer: resale the mesh using Elmer

- according to Peter from the Elmer team, we can use Elmer for both, scaling in and scaling back just for consistency

src/Mod/Fem/femsolver/elmer/tasks.py

@@ -252,7 +252,9 @@ class Results(run.Results):
             self.fail()
             return
         self.solver.ElmerResult.read(postPath)
-        self.solver.ElmerResult.scale(1000)
+        # at the moment we scale the mesh back using Elmer
+        # this might be changed in future, therefore leave this
+        #self.solver.ElmerResult.scale(1000)
         self.solver.ElmerResult.getLastPostObject().touch()
         self.solver.Document.recompute()
 

src/Mod/Fem/femsolver/elmer/writer.py

@@ -1500,6 +1500,10 @@ class Writer(object):
 
     def _addOutputSolver(self):
         s = sifio.createSection(sifio.SOLVER)
+        # Since FreeCAD meshes are in mm we let Elmer scale it
+        # _handleSimulation(self).
+        # To get it back in the original size we let Elmer scale it back
+        s["Coordinate Scaling Revert"] = True
         s["Equation"] = "ResultOutput"
         s["Exec Solver"] = "After simulation"
         s["Procedure"] = sifio.FileAttr("ResultOutputSolve/ResultOutputSolver")