This study presents a numerical investigation of the noise mitigation effect provided by several fairings placed upstream of a simplified two-wheel landing gear. The chosen configuration is equipped with detachable elements that mimic realistic components, e.g. brakes and torque link, to include representative landing gear noise sources. Several numerical simulations of the flow developing around this landing gear have been carried out, with or without an additional upstream fairing to control the noise generation processes. The chosen configurations match those from related experiments performed at the Delft University of Technology. Both the numerical and the experimental studies are conducted in the framework of the European Union Horizon 2020 research project INVENTOR (INnoVative dEsign of iNstalled airframe componenTs for aircraft nOise Reduction). The numerical method is based on the Zonal Detached Eddy Simulation approach, applied on a set of Cartesian octree grids with a specific immersed boundary wall treatment. Both solid and wire mesh fairings are considered, the latter being accounted for thanks to a specific wire mesh numerical model. Overall, the simulations show a nice agreement with the measurements and allow a thorough analysis of the flow modifications responsible for noise mitigation when the fairings are introduced.

In order to cope with increasing air traffic and the requirement to decrease the overall footprint of the aviation sector-making it more sustainably and acceptable for the whole society-drastic technology improvements are required beside all other measures. This includes also the development of novel aircraft configurations and associated technologies which are anticipated to bring significant improvements for fuel burn, gaseous and noise emissions compared to the current state and the current evolutionary development. Several research projects all over the world have been investigating specific technologies to address these goals individually, or novel-sometimes also called "disruptive" -aircraft concepts as a whole. The chapter provides a small glimpse on these activities-mainly from a point of view of recent European funded research activities like Horizon2020 projects ARTEM, PARSIFAL, and SENECA being by no-way complete or exhaustive. The focus of this collection is on noise implications of exemplary novel concepts as this is one of the most complicated and least addressed topics in the assessment of aircraft configurations in an early design stage. Beside the boundary layer ingestion concept, the design process for a blended wing body aircraft is described, a box-wing concept is presented and an outlook on emerging supersonic air transport is given.