Reduced-Order Models for Aerodynamic Applications, Loads and MDO

This article gives an overview of reduced-order modeling work performed in the DLR project Digital-X. Parametric aerodynamic reduced-order models (ROMs) are used to predict surface pressure distributions based on high-fidelity computational fluid dynamics (CFD), but at lower evaluation time and storage than the original CFD model. ROMs for steady aerodynamic applications are built using proper orthogonal decomposition and Isomap, a manifold learning method. Approximate solutions in the so-obtained low-dimensional representations of the data are found with interpolation techniques, or by minimizing the corresponding steady flow-solver residual. The latter approach produces physics-based ROMs driven by the governing equations. The steady ROMs are used to predict the static aeroelastic loads in a multidisciplinary design and optimization context, where the structural model is to be sized for the (aerodynamic) loads. They are also used in a process where an a priori identification of the critical load cases is of interest and the sheer number of load cases to be considered does not lend itself to high-fidelity CFD. An approach to correct a linear loads analysis model using steady CFD solutions at various Mach numbers and angles of attack and a ROM of the corrected aerodynamic influence coefficients is also shown. This results in a complete loads analysis model preserving aerodynamic nonlinearities while allowing fast evaluation across all model parameters. The different ROM methods are applied to a 3D test case of a transonic wing-body transport aircraft configuration.

• Record URL:
  https://doi.org/10.1007/s13272-018-0283-6
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/18695582
• Supplemental Notes:
  • Copyright © 2018, Deutsches Zentrum für Luft- und Raumfahrt e.V.
• Authors:
  • Ripepi, M
  • 0000-0003-1986-9585
  • Verveld, M
  • Karcher, N
  • Franz, T
  • Abu-Zurayk, M
  • Görtz, S
  • Kier, T
• Publication Date: 2018-3

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: pp 171-193
• Serial:
  • CEAS Aeronautical Journal
  • Volume: 9
  • Issue Number: 1
  • Publisher: Springer-Verlag
  • ISSN: 1869-5582
  • EISSN: 1869-5590
  • Serial URL: http://link.springer.com/journal/13272

Subject/Index Terms

• TRT Terms: Aerodynamics; Design engineering; Fluid dynamics; Loads; Wing loading
• Uncontrolled Terms: Decomposition analysis
• Subject Areas: Aviation; Design; Vehicles and Equipment;

Filing Info

• Accession Number: 01670991
• Record Type: Publication
• Files: TRIS
• Created Date: May 29 2018 4:05PM