Hydro-structural problems can be approached with CFD in two manners: 1) as one-way coupling, where the hydrodynamic loads calculated with CFD are just used as input for structural (FEM) solvers; 2) as two-way coupling where the structure deformations are applied back to the geometries/grids in the CFD solver, and where an iterative procedure is used until convergence is achieved. This second one is usually denoted by FSI, or Fluid-Structure-Interaction. In the last years FSI (for elastic deformation of the structures) capabilities have been implemented in ReFRESCO, using a coupling with an external commercial FEM package). Some verification and validation exercises have been done (see example of a cylinder+beam and a 3D riser below). This capability will be only finished in the course of 2016, and is not included in the production code before 2017. Anyhow, progress has been made…

 

A 2D BEAM

 

A 3D offshore riser