Hueso Rebassa, JosepTejero, FernandoOtter, John J.Goulos, IoannisMacManus, David G.2020-03-162020-03-162020-02-28Hueso-Rebassa J, Tejero F, Otter J, et al., (2020) Multi-fidelity assessment of exhaust systems for complete engine-airframe integrations. Proceedings of Aerospace Europe Conference 2020 (AEC2020), 24-28 February 2020, Bordeaux, France. Paper number 00337https://dspace.lib.cranfield.ac.uk/handle/1826/15286For podded underwing configurations, the goal of specific fuel consumption reduction has led to engine designs with larger fan diameters and higher bypass ratios to increase propulsive efficiency. As a consequence of this trend, the aerodynamic interference with the airframe is increased. Non-axisymmetric exhaust geometries could minimise such interference for coupled configurations. Class Shape Transformation functions are used to define 3D podded engine geometries that are installed on a transonic aircraft configuration. The complete system is assessed at mid-cruise conditions of a representative long-range cruise operation. The assessment is conducted by multi-fidelity computational fluid dynamics computations that are Euler inviscid and Reynolds Averaged Navier Stokes turbulent methods. The correlation between the different fidelities is analysed and a multi-fidelity co-kriging model is developed. The model is applied to predict the behaviour of installed non-axisymmetric exhaust systems and results into a 33% computational benefit compared to single-fidelity surrogates.enAttribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/Complete aircraft assessmentinstalled performancenon-axisymmetric exhaust systemsmulti-fidelity analysisco-krigingConference paper