  We present the implementation of a solution scheme for fluid-structure
interaction problems via the finite element software library deal.II. The
solution scheme is an immersed finite element method in which two independent
discretizations are used for the fluid and immersed deformable body. In this
type of formulation the support of the equations of motion of the fluid is
extended to cover the union of the solid and fluid domains. The equations of
motion over the extended solution domain govern the flow of a fluid under the
action of a body force field. This body force field informs the fluid of the
presence of the immersed solid. The velocity field of the immersed solid is the
restriction over the immersed domain of the velocity field in the extended
equations of motion. The focus of this paper is to show how the determination
of the motion of the immersed domain is carried out in practice. We show that
our implementation is general, that is, it is not dependent on a specific
choice of the finite element spaces over the immersed solid and the extended
fluid domains. We present some preliminary results concerning the accuracy of
the proposed method.
