  Isogeometrically enriched finite elements offer efficient localized
isogeometric analysis (IGA) enrichment for numerical simulations involving
large computational domains. This is achieved by employing surface enriched
elements to interface isogeometric elements with classical Langrangian finite
elements. In this paper, we explore their applicability and merits for
fluid-structure interaction (FSI) analysis. The implemented approach not only
offers an enrichment of the finite element space, but also offers a framework
for discretizing and analyzing fluid and structure with different finite
element approaches, namely, classical Lagrange finite elements and IGA. In this
context, a monolithic solution approach with an explicit grid update mechanism
is implemented for FSI. The applicability and the impact of the isogeometric
enrichment approach on the accuracy of the numerical solution is assessed by
comparing the obtained results with existing reference solutions of FSI
benchmark examples involving two- and three-dimensional incompressible fluid
flow past hyper-elastic solids.
