Convection-Diffusion Examples

[peterphilippe]

• Code to generate the plots of the two convection-diffusion examples 10.2.2.30 (7.2.2.30) and 10.2.2.31 (7.2.2.31) in the lecture notes.
• The code also generates the two plots for Example 10.2.2.15. This example analyses exactly the same problem as 10.2.2.30 (but compares Upwind vs Standard FEM instead of Upwind vs SUPG)
• The implementation of the Upwind method relies on some code from the "UpwindQuadrature" homework problem for local computations. This creates some dependency on that particular homework problem, but I think this is better than to duplicate the code.

Example 10.2.2.30

Example 10.2.2.31

[hiptmair]

After the above small enhancement have been implemented this branch can be merged.