Abstract
In development of advanced aircraft at the next generation, high flight maneuverability is required according to magnifying an operating limitation. A close-coupled canard aircraft such as Eurofighter is proposed as an example of advanced aerodynamic configuration. Three-dimensional Reynolds-Averaged Navier-Stokes simulations are carried out for subsonic and transonic flows over the canard-wing-body-tail and the canard-wing-body configurations of the close-coupled canard aircraft by introducing hybrid unstructured grid technique together with Spalart-Allmaras one-equation turbulence model. With respect to surface pressure distributions and force and moment coefficients, the present computed results are quantitatively compared to the wind-tunnel testing data and the Euler computed results. The present computed results show good prediction in estimation of canard deflection effect on aerodynamic performance except pitching moment coefficient. It becomes clear that the present hybrid unstructured CFD solver is expected to be a powerful tool for aerodynamic design of advanced aircraft.
