Variable-fidelity optimization applied to wing-body configuration

Based on the trust region method, a variable-fidelity optimization method is developed to effectively manage and utilize low-fidelity models and high-fidelity models. The low-fidelity model was employed to build an approximation model in optimization process, while the high-fidelity model was used to correct the optimization approximation model and make the optimization results converged to high-fidelity model optimization results. The viscous and inviscid iteration of full-potential method and boundary layer method was chosen as the low-fidelity model and the multi-grid Navier-Stokes method was utilized as the high-fidelity model to optimize the wing-body configuration. The optimization results show that the method has not only high efficiency, but also good accuracy, therefore, is of practical meaning.