Merge branch 'main' of github.com:byuflowlab/DuctAPE.jl

README.md

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 DuctAPE has been developed specifically for applications in gradient-based optimization settings. <!-- add citations later -->
 The default solver methods have been chosen to balance code efficiency as well as robustness while simultaneously allowing for efficient automatic differentiation through DuctAPE employing [ImplicitAD.jl](https://flow.byu.edu/ImplicitAD.jl/dev/).
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+## Publications
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+[Mehr, J., and Ning, A., “DuctAPE: A steady-state, axisymmetric ducted fan analysis code designed for gradient-based optimization.,” AIAA Aviation Forum, Las Vegas, Jul. 2024. doi:10.2514/6.2024-4297](https://scholarsarchive.byu.edu/facpub/7214/)