  In this work, we implement goal-oriented error control and spatial mesh
adaptivity for stationary fluid-structure interaction. The a posteriori error
estimator is realized using the dual-weighted residual method in which the
adjoint equation arises. The fluid-structure interaction problem is formulated
within a variational-monolithic framework using arbitrary Lagrangian-Eulerian
coordinates. The overall problem is nonlinear and solved with Newton's method.
We specifically consider the FSI-1 benchmark problem in which quantities of
interest include the elastic beam displacements, drag, and lift. The
implementation is provided open-source published on github
https://github.com/tommeswick/goal-oriented-fsi. Possible extensions are
discussed in the source code and in the conclusions of this paper.
