Coupled aeroelastic analysis of modern aircraft wings using high-fidelity CFD and FEM techniques

Modern composite wings enhance efficiency but increase aeroelastic risks due to flexibility. Traditional decoupled methods yield flutter speed errors over 20%. This study introduces a high-fidelity CFD-FEM partitioned framework using ANSYS Fluent and Mechanical to resolve two-way FSI. Key features include RBF mesh adaptation, Hashin failure criteria for CFRP, and validation against AGARD 445.6. Flutter onset at Mach 0.78 (305 m/s) was predicted with <4% error, with peak stress of 358 MPa and dominant modes at 8.2 Hz and 12.5 Hz. Aerodynamic hysteresis confirmed limit-cycle oscillations. The method supports FAA §25.629 compliance and improves accuracy over conventional approaches.