Numerical Simulation of Flap-Control Aeroelastic Response Using CFD/CSD Coupling

A numerical simulation method using computational fluid dynamics/computational structure dynamics(CFD/CSD)coupling on the moving grids was presented and applied to the research of flap-control aeroelastic response. Navier-Stokes equations were adopted as governing equations with finite volume method based on unstructured grids in the spatial discretization. Convective fluxes were computed using HLLC Riemann solver. A LU-SGS operator was applied to time integrate, with 2nd order time-accuracy dual-time stepping method for temporal discretization. Structural dynamics used linear modal superposition method. In the simulation, CFD method was coupled with structural mode equations for aeroelastic numerical simulation by modified loose coupling. Transformations of surface loads and displacements between aerodynamic grids and structure grids were achieved by infinite plate spline method(IPS). Movement and deformation of aircraft were based on the combination of overlapping grids and Delaunay graph mapping method. The feasibility of the numerical simulation method developed in this paper was confirmed by multiple examples. Results show that this method can efficiently simulate the flap-control aeroelastic response in the process of flight maneuvering.