The impact of the elevons has been evaluated by Airbus France using low fidelity tools and needs to be accurately evaluated with high fidelity RANS computations. The purpose of this study is to define and take into account low speed criteria to perform a complete optimization of the configuration. The optimization process used at that time was not able to take into account low speed criteria which are essential on this type of configurations for obtaining an aircraft with good handling qualities at take-off. While high improvements in terms of lift-to-drag ratio and equilibrium have been reached, it has been determined that this configuration would encounter issues at low-speed. Recently an optimization was carried out by ONERA to increase the performance at cruise of the initial design. The project consists in designing viable flying wing geometries in terms of aerodynamic cruise and take-off performance. This study has been made in the framework of a French national research project called AVECA where ONERA is responsible for the aerodynamic shape optimization of an initial blended-wing-body configuration provided by Airbus France.
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