Identificação do fenômeno aeroelástico de flutter a partir de simulações FSI (fluid-structure interaction)

Abstract

Aeroelastic analyses are an essential part of aeronautical projects. To avoid catastrophes, it is necessary to know if aeroelastic phenomena like flutter are present in the flight envelope. For that, it is common to use NASTRAN. It applies Double Lattice Method as aerodynamic solver. However, this method might not be the most appropriate one aerodynamically and CFD can achieve better results. In this context, this work suggests to identify flutter through FSI method (fluid-structure interaction). Using ANSYS software, it is possible to couple structural and fluid-dynamic modules in order to make the structural send displacements to fluid-dynamic, and the fluid-dynamic send forces to structural. From the displacement temporal sign, on a selected point, the aeroelastic behavior can be evaluated. This methodology was applied on AGARD 445.6 wing. It was possible to find flutter, as expected, by simulating flow on different velocities.