A kinematic method for the computation of the natural modes of Fluid-Structure Interaction systems

It is shown that the coupled modes of a fluid-structure system can be computed by combining its uncoupled modes, with a procedure involving symmetric matrices. Indicators of the coupling strength are provided: it is shown that strongly coupled systems do not exhibit large variations of their behavior when their uncoupled natural frequencies coincide, whereas weakly coupled systems do. Applications to some case studies of FSI are provided.