A reduced-order model for segregated fluid-structure interaction solvers based on an ALE approach

This article presents a Galerkin projection model-order reduction approach for segregated fluid-structure interaction in an Arbitrary Lagrangian Eulerian (ALE) approach at low Reynolds number using the Finite Volume Method (FVM). The reduced-order model (ROM) is based on the proper orthogonal decomposition (POD), with a data-driven technique that combines the classical Galerkin projection and radial basis networks. The results show the stability and accuracy of the proposed method with respect to the high-dimensional model by capturing transient flow fields and, more importantly, the forces acting on the moving object. The effectiveness of this approach is demonstrated in the case study of vortex-induced vibrations (VIV) of a cylinder at Reynolds number Re = 200. The mixing up technique results to an accurate algorithm for resolving fluid-structure interaction problems with moving meshes.