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:
-
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