Finite element modeling of fluid-structure interaction of an elastic 2D flag in harmonic viscous fluid flow and an elastic 3D sail structure in stationary viscous fluid flow (concised version)

Abstract

. A fully consistent finite element model for fluid-structure interaction between incompressible viscous fluids and elastic structures considering large structural deformation is presented. The coupling approach is based on a segregated solution procedure for the Navier-Stokes equations for incompressible viscous fluid flow and the structural equation of motion for elastic structures. The fluid-structure interaction model is applied on the 2D example of a rigid and elastic, respectively, flag in the quasi-harmonic fluid wake flow behind a square rigid obstacle. Time-harmonic pattern of fluid flow and time-harmonic structural deformation are evaluated at different steps of oscillation. Transient evolution of acting coupling forces on the common fluid-structure interface is shown and pointed out. The fluid-structure interaction model is further applied on the 3D example of a rigid and elastic, respectively, mast and sail structure that is exposed to quasi-stationary fluid flow on its surface. Corresponding structural response is analyzed with respect to different stages of fluid-structure coupling that can be applied to finally arrive at the fully consistent stage of the fluid-structure interaction model. Characteristics of fluid flow pattern and deformation of mast and sail structure are pointed out. The concised version only shows evaluation of computational results.