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The AIAA 1st ice prediction workshop focused on establishing current 2D and 3D simulation capabilities towards ice accretion on aircraft by bringing together scientists from diverse backgrounds such as code developers, experimentalists and users. To that end, experimentally and publicly available rime and glaze ice accretion data were provided for a wide range of applications. The geometries include single and multi-element airfoils, wings, engine inlet and horizontal tail configurations in flow with different droplet size distributions including Supercooled Large Droplets. In addition to ice accretion, data such as pressure distribution, ice mass and collection efficiency were provided, when available. Results from various Computational Fluid Dynamics workflows were provided by academia, research/federal centers and industries. The submitted data is analyzed via code-to-code and code-to-experiment comparison plots. While the many comparisons are now publicly available, the paper presents the detailed analysis on some selected baseline and optional cases. A methodology and technology gap assessment concludes on the current state-of-the-art and presents possible future workshops directions to improve our understanding and modeling of the various phenomena at play. I. Nomenclature= Collection efficiency = Liquid water content = Mean aerodynamic chord = Median volume diameter

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