Modal Analysis of Fluid-Structure Interaction Behavior using Dynamic Mode Decomposition

Abstract

A numerical simulation model for fluid-structure interaction (FSI) based on the partitioned coupling approach was developed, to investigate the Turek-Hron benchmark case as a simple FSI model. In addition, dynamic mode decomposition (DMD) was applied to displacement of the elastic flap by the FSI simulation, to extract the fundamental structure of complex spatiotemporal data. The present FSI model reproduced well the limit-cycle oscillation derived by the elastic deformation and fluid flow in the Turek-Hron case. The DMD with a mode-sensing approach based on the Greedy algorithm revealed the dominant structures of the deformation of the elastic flap with unique frequencies.