  Robin boundary conditions are a natural consequence of employing Nitsche's
method for imposing the kinematic velocity constraint at the fluid-solid
interface. Loosely-coupled FSI schemes based on Dirichlet-Robin or Robin-Robin
coupling have been demonstrated to improve the stability of such schemes with
respect to added-mass. This paper aims to offer some numerical insights into
the performance characteristics of such loosely-coupled FSI schemes based on
Robin boundary conditions. Using numerical examples, we demonstrate that the
improved stability due to the added damping term is actually at the expense of
important dynamic characteristics of the structural sub-problem.
