Linearized Euler Solver for Rapid Frequency-Domain Aeroelastic Analysis

摘要

An unsteady Euler solver based on a stationary Cartesian grid that uses the transpiration boundary conditions is enhanced with the linearized Euler method for rapid computation of the frequency-domain generalized aerodynamic forces (GAFs). The linearized Euler method reduces the time-domain simulation to a steady flow solution, thus speeding up the traditional process of extracting GAFs from the time-domain computational fluid dynamics solutions by roughly an order of magnitude. The new Unearned Euler solver is first validated by the two-dimensional airfoil and three-dimensional wing rigid-body pitching test cases, as well as a flutter boundary prediction of the AGARD 445.6 weakened-wing model. Then, aeroelastic analysis of the twin-engine transport flutter model is performed using this new solver. Good correlation between the flutter boundary obtained by this linearized Euler method and the transonic dynamic tunnel experimental data is demonstrated.