Speaker
Description
This contribution describes a Fluid–Structure Interaction (FSI)
solver based on a partitioned steering approach. The structural
partecipant is modeled using linear elasticity and advanced in time with
a one-step theta method. Such a model is coupled with a numerical
method for incompressible quasi-potential flows around three-dimensional
lifting streamlined bodies (Cattarossi et al., 2026).
The discretization methods for the solid and fluid problems are based on
the Finite Element Method (FEM) [deal.II] and the collocation Boundary
Element Method (BEM) [$\pi$-BEM, (Giuliani et al., 2018)], respectively.
The interaction between the structural and fluid solvers is managed by
means of preCICE (Chourdakis, Davis, Rodenberg, Schulte, Simonis,
Uekermann et al., 2022), a fully parallel library for multi-physics
surface coupling. It operates as an independent black-box code handling
a mesh-to-mesh data mapping, temporal coupling, and convergence
acceleration.
To ensure stable and accurate exchange of interface quantities,
particular attention is paid to defining consistent coupling variables
and treating the mismatch on the two different meshes. In particular,
the displacement and velocity fields provided by the structural solver
are projected onto the fluid interface, while the pressure loads
calculated from the boundary element formulation are transferred to the
structure. Within preCICE, these operations are complemented by
fixed-point acceleration, implicit coupling iterations, and relaxation
strategies that ensure robustness.
Numerical results and application cases are be presented to demonstrate
the effectiveness of the approach proposed.