Manifold Learning of Nonlinear Airfoil Aerodynamics with Dimensionality Reduction

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Abstract

This paper aims to explore the advantages offered by machine learning (ML) for dimensionality reduction of nonlinear transonic aerodynamics. Three ML techniques are evaluated in terms of their ability to generate interpretable low-dimensional manifolds of the transient pressure distributions over a NACA4412 airfoil equipped with a flap. These ML techniques are Kernel Principle Component Analysis (kPCA), Locally Linear Embedding (LLE), and t-distributed Stochastic Neighbourhood Embedding (t-SNE). Initial investigations are also carried out to evaluate the performance of Artificial Neural Networks (ANNs). Three transient aerodynamic test cases are evaluated. First, a static aerodynamic transient analysis. Second, pitching and heaving airfoils in terms of prescribed sinusoidal displacements. Lastly, the airfoil geometry is adapted to include a flap under sinusoidal actuation. The snapshots forming the ground truth are obtained from unsteady CFD simulations. The preliminary results of this study reveal that patterns exist in low-dimensional nonlinear manifolds. Furthermore, unsupervised learning techniques are seen to outperform supervised neural networks in terms of both training cost and reconstruction accuracy. Promising reconstruction capabilities are observed with unsupervised learning.
Original languageEnglish
Title of host publicationAIAA SciTech Forum 2023
Number of pages16
ISBN (Electronic)978-1-62410-699-6
DOIs
Publication statusPublished - 2023
EventAIAA SCITECH 2023 Forum - National Harbor, MD & Online, Washington, United States
Duration: 23 Jan 202327 Jan 2023
https://arc-aiaa-org.tudelft.idm.oclc.org/doi/book/10.2514/MSCITECH23

Conference

ConferenceAIAA SCITECH 2023 Forum
Country/TerritoryUnited States
CityWashington
Period23/01/2327/01/23
Internet address

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