Analytical and experimental characterization of aerodynamic and aeroacoustic effects of closely operating propellers for distributed propulsion wing solutions. This topic is issued to develop and improve current know-how and design capabilities in the field of distributed propulsion applied to large A/C. The purpose of the topic is the analytical and experimental characterization of the flow interactions of closely operating propellers arranged in different ways on the wing, in order to improve and validate the CFD / CAA design capabilities and know-how within WP 1.6 of CS2-LPA. This topic is meant to develop the necessary physical understanding to progress in the design and assessment of new disruptive concepts with reduced emissions & noise, paving the way for future European initiatives. Please refer to the full topic descriptions document published in this call.