The wheelset problem is an Implicit Differential Equation of dimension 17
which shows some typical properties of simulation problems in
contact mechanics, i.e., friction, contact conditions, stiffness,
etc.. This problem is originally described by an index 3 IDE with
additional 1 equations, but can be reduced to index 2. Test results
are based on the index-2 formulation.
A complete description of the problem could be found in
wheel.pdf
