Flutter Post processor

Flutter is a specific aeroelastic instability analyzed in MSC Nastran. It arises when unsteady aerodynamic forces supply more energy to a flexible structure than structural damping can remove. At a critical speed or dynamic pressure (flutter speed, Vf), aeroelastic coupling—typically between a bending mode and a torsion mode—produces a self-excited oscillation with negative aerodynamic damping, causing amplitudes to grow rapidly.

This application parses MSC Nastran .f06 output from a PK flutter solution and presents the results graphically. It plots a user-defined flight envelope, identifies and displays critical crossing points within that envelope, and extracts and charts the full set of crossings. All runs are archived so results are easy to review and compare, making it straightforward to study the physics and the sensitivity to small modeling changes.

Generate atmospheric data and NASTRAN Flutter cards