Aileron Buzz Simulation Using an Implicit Multiblock Aeroelastic Solver

A fully implicit multiblock aeroela stic solver, which coupled thin-layer Navier–Stokesequationswith structural equations of motion, hasbeen developed for the utter simulationon complex aerodynamiccon gurations.Navier–Stokes equa tions are solved with a lower–upper symmetric Gauss– Seidel subiteration algorithm and a modied Harten– Lax– van Leer– Einfeldt–Wada scheme.Structural equations of motion are discretized by a direct secondorder differential method with subitera tionin generalized coordinates. The transniteinterpolation is used for the grid deformation of the blocks neighboring the exible surface. To evaluate the effectiveness of the grid deformation,a comparison is rst done for the oscillating LANN wing with a rigidly attached grid and a deforming grid. Then the method is applied to predict the utter speed and frequency of the AGARD 44 5.6 standard aeroelastic wing.Finally, the aeroelastic instability referred to a saileron buzz is simulatedfor the supersonic transport model of the National Aerospace Laboratory of Japan.