Added mass evaluation with a finite-volume solver for applications in fluid-structure interaction problems solved with co-simulation

A specific focus is here laid on the characterisation of the numerical properties of the proposed coupling algorithm in terms of convergence speed and stability. In order to stabilise the segregated algorithm while keeping non-intrusive in the structure solver, a relaxation operator based on an artificial added mass technique is used. To compute an efficient relaxation operator, an original resolution of the added mass effect is implemented into the fluid finite-volume solver. Good convergence properties are observed for rigid bodies with six degrees of freedom even in case of strong destabilising added mass effects.