Co-authored-by: Wolfgang Bangerth <bangerth@colostate.edu>
The FEInterfaceValues class provides an easy way to obtain the jump and the average of the solution across cell faces.
This tutorial includes the following topics.
<ol>
- <li> The SIPG method for Poisson's equation, which has been used in step-39 and step-59.
+ <li> The SIPG method for Poisson's equation, which has already been used in step-39 and step-59.
<li> Assembling of face terms using FEInterfaceValues and the system matrix using MeshWorker::mesh_loop(), which is similar to step-12.
<li> Adaptive mesh refinement using an error estimator.
<li> Two test cases: convergence test for a smooth function and adaptive mesh refinement test for a singular solution.
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