// elastic8.fe

// Elastic string in the shape of a figure 8.

string
space_dimension 2
scale_limit 0.1   // else blows up on first iteration

quantity bending_energy  energy method sqcurve_string global

quantity arclength fixed = 14 method edge_length global

vertices
1    2 0
2    1 1
3    0 0
4   -1 -1
5   -2 0
6   -1 1
7    0 0
8    1 -1

edges
1  1 2 tension 0
2  2 3 tension 0
3  3 4 tension 0
4  4 5 tension 0
5  5 6 tension 0
6  6 7 tension 0
7  7 8 tension 0
8  8 1 tension 0