add a section adaptive mesh refinement and in implementation a passage for the Input...

git-svn-id: https://svn.dealii.org/trunk@28314 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/deal.II/examples/step-42/doc/intro.dox b/deal.II/examples/step-42/doc/intro.dox
index beb68024eafd729761f9799c2f70c818e94c0242..3b221f23487417b61de3c7c1510398ead97ab767 100644 (file)
--- a/deal.II/examples/step-42/doc/intro.dox
+++ b/deal.II/examples/step-42/doc/intro.dox
@@ -315,6 +315,15 @@ using a primal-dual active set strategy and algebraic multigrid, Int. J. Numer.
 Meth. Engng, 2007, 69, pp. 524-543.
 
 
+<h3>Adaptive mesh refinement</h3>
+
+Since we run our program in 3d, there is a good reason to use adaptive
+mesh refined. To make life a bit easier we are choosing the
+KellyErrorEstimator that is already implemented in deal.II. We hand the
+solution vector to it which contains the displacement $u$. As we will see in the
+results it yields a quite reasonable adaptive mesh for the contact zone.
+
+
 <h3>Implementation</h3>
 
 This tutorial is essentailly a mixture of step-40 and step-41 but instead of
@@ -327,5 +336,6 @@ Another difficulty is the handling of the different constraints from
 arises from the contact. For this purpose we create three objects of type 
 ConstraintMatrix.
 
-
-
+Beside the ConstitutiveLaw class there is another new class called Input. This
+class allows us to read in an obstacle from a file. In our example the file
+'obstacle\_file.dat' containts data which describe the Chinese symbol for force.