Aeroelastic mode decomposition framework and mode selection mechanism in fluid–membrane interaction

In this study, we present a global Fourier mode decomposition framework for unsteady fluid–structure interaction. We apply the to isolate and extract aeroelastic modes arising from coupled three-dimensional fluid–membrane system. investigate frequency synchronization between vortex shedding structural vibration via analysis. explore role of flexibility in selection perform systematic comparison flow features among rigid flat wing, cambered wing flexible membrane. The camber effect can enlarge pressure suction area on membrane surface suppress turbulent intensity, compared counterpart. With aid our technique, find that dominant exhibits chordwise second spanwise first at different angles attack. natural corresponding is estimated using an approximate analytical formula. By examining system, show selected lock-in frequency. From fluid energy spectra α=20∘ 25°, non-integer components lower than are observed, which associated with bluff body instability. non-periodic behaviors observed higher attack related interaction caused by bluff-body-like shedding. Using analysis, suggest feedback cycle wings undergoing synchronized self-sustained vibration. This reveals through during exhibit similar modal shapes pulsation.