A coupling model for fluid-structure interaction applications with free-surface flows and rigid-bodies

Resumo

In the present work, a formulation based on the Characteristic Based Split (CBS) method is proposed
for applications in fluid-structure interaction (FSI) and free-surface flow problems. The flow fundamental
equations are discretized here using the CBS method in the context of the Finite Element Method (FEM), where
linear tetrahedral elements are employed. A semi-implicit scheme is used, where the momentum equations are
solved explicitly while the mass equation is solved implicitly through a Poisson equation. FSI is taken into
account considering a partitioned coupling model and the rigid-body approach, considering an Arbitrary
Lagrangian-Eulerian (ALE) kinematic formulation. The resulting dynamic equilibrium equation is solved using
the Generalized- method. Free-surface flows are analyzed using the Level Set Method (LSM), considering a
two-phase medium. Classic free-surface and FSI problems are simulated in order to evaluate the present
formulation, comparing results obtained here with experimental results and predictions obtained with other
numerical formulations available. It is concluded that the proposed numerical tool is able to obtain results
consistent with the phenomena involved.