In the present work the problem of fluid-structure interaction (FSI) with independently discretized fluid and structure fields is addressed in the context of finite elements. To be able to deal with non-conforming meshes at the fluid-structure interface, we propose the integration of a dual mortar method into the general FSI framework. This method has lately been used successfully to impose interface constraints in other contexts such as finite deformation contact. The main focus is set on monolithic coupling algorithms for FSI here. In these cases the dual mortar approach allows for the complete elimination of the additional Lagrange multiplier degrees of freedom from the global system. The resulting system matrices have the same block structure as their counterparts for the conforming case and require the same numerical treatment. Partitioned Dirichlet-Neumann coupling is also considered briefly and it is shown that the dual mortar approach permits a numerically efficient mapping between fluid and structure quantities at the interface.     «

In the present work the problem of fluid-structure interaction (FSI) with independently discretized fluid and structure fields is addressed in the context of finite elements. To be able to deal with non-conforming meshes at the fluid-structure interface, we propose the integration of a dual mortar method into the general FSI framework. This method has lately been used successfully to impose interface constraints in other contexts such as finite deformation contact. The main focus is set on...     »