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• W2319870061 abstract "This paper is the first part of a series of three papers dedicated to the prediction of lowspeed interaction noise of an isolated contra-rotating open rotor (CROR). The objective of this study is to assess available analytical and numerical methodologies in terms of robustness, performance and accuracy. The analytical procedure follows the classical Sears’ theory, while the numerical procedure follows a two-step approach based on CFD coupled with the analogy of Ffowcs Williams-Hawkings (FWH). Concerning the numerical tools, both chorochronic (single-passage) and Chimera (full-annulus) approaches are considered. The prediction of interaction noise requires fulfilling three modelling steps: the aerodynamic perturbations, the rotor unsteady blade response and the resulting noise radiation. Comparisons with noise measurements are provided. It is shown that the results are highly sensitive to the description of the incoming wake deficit. The chorochronic approach, as a single blade passage is computed, allows the use of much finer meshes than the Chimera approach and requires a lower computational cost. This approach is therefore highly attractive for computing isolated axisymmetric configurations." @default.
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• W2319870061 date "2012-06-04" @default.
• W2319870061 modified "2023-09-25" @default.
• W2319870061 title "Computational strategy for predicting CROR noise at low-speed Part I: review of the numerical methods" @default.
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• W2319870061 doi "https://doi.org/10.2514/6.2012-2221" @default.
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