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Coupled CFD-CSM Analyses of a Highly Flexible Transport Aircraft by Means of Geometrically Nonlinear Methods

Zimmer, Markus and Feldwisch, Johan Moritz and Ritter, Markus Raimund (2022) Coupled CFD-CSM Analyses of a Highly Flexible Transport Aircraft by Means of Geometrically Nonlinear Methods. International Forum on Aeroelasticity and Structural Dynamics, IFASD 2022, 13.-17. Juni, Madrid, Spanien.

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The ever lasting race towards increased efficiency in the aircraft industry has resulted in excessively slender and lightweight airframes. Utilising the anisotropic characteristics of specifically tailored composites is one key driver, enabling structural concepts which were impossible a few decades ago. The results are highly flexible aircraft structures, pushing geometrically linear methods to their limits. One example of such a concept is the Boeing 787 which reaches wing tip displacements of approximately 10 % of the wing half span already during cruise flight. Thus, loads and flight dynamics analyses have to be developed which are accurate in the context of large deflections. By utilising a coupled CFD-CSM analysis in combination with a highly flexible long range jet transport model, this paper aims to establish the groundwork for a high fidelity geometrically nonlinear loads framework. In this publication, a general methodology to compute static manoeuvre cases with deflections of up to 25 % is presented. Furthermore, by computing rigid and elastic polars as well as calculating pull up and push down manoeuvres, the differences between geometrically linear and nonlinear simulations are illustrated with respect to aerodynamic parameters, cut loads, and strains.

Item URL in elib:https://elib.dlr.de/187448/
Document Type:Conference or Workshop Item (Speech)
Title:Coupled CFD-CSM Analyses of a Highly Flexible Transport Aircraft by Means of Geometrically Nonlinear Methods
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Zimmer, MarkusMarkus.Zimmer (at) dlr.dehttps://orcid.org/0000-0001-6785-7402
Feldwisch, Johan MoritzJohan.Feldwisch (at) dlr.dehttps://orcid.org/0000-0002-4522-3721
Ritter, Markus RaimundMarkus.Ritter (at) dlr.dehttps://orcid.org/0000-0003-3828-0397
Date:June 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:CFD, CSM, computational aeroelasticity, geometrically large deformations, nonlinear loads analysis, very flexible aircraft
Event Title:International Forum on Aeroelasticity and Structural Dynamics, IFASD 2022
Event Location:Madrid, Spanien
Event Type:international Conference
Event Dates:13.-17. Juni
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation, L - Digital Technologies
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Loads Analysis and Aeroelastic Design
Deposited By: Zimmer, Markus
Deposited On:22 Aug 2022 13:46
Last Modified:22 Aug 2022 13:46

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