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Large-Amplitude Gusts on the NASA Common Research Model

Friedewald, Diliana (2023) Large-Amplitude Gusts on the NASA Common Research Model. Journal of Aircraft, 60 (6). American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.C037198. ISSN 1533-3868.

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Official URL: https://arc.aiaa.org/doi/10.2514/1.C037198


To date, there is limited knowledge on the topic of unsteady nonlinear transonic flow caused by large-amplitude excitations. The Certification Specifications for Large Aeroplanes, however, demand loads computations for large-amplitude excitations, e.g., for gust encounters of an aircraft. In this paper, numerical solutions to the unsteady Reynolds-averaged Navier-Stokes equations will be used to analyze gust responses of a transport aircraft configuration for a variety of sinusoidal gusts with different lengths and amplitudes at different Mach numbers. On the one hand, it is shown that unsteady nonlinear responses can lead to lower maximum lift values compared to their time-linearized reference due to unsteady shock-induced flow separation. This nonlinear effect dominates for large gust lengths and higher Mach numbers. On the other hand, for the lowest Mach number considered, the coalescence of a double shock at medium gust lengths introduces nonlinear effects leading to an overprediction of the time-linearized maximum lift by the nonlinear computations. Though the turbulence model of Spalart and Allmaras shows completely different separation patterns than a differential Reynolds stress model, the variation of the turbulence model does not alter the overall qualitative findings, but has an effect on the quantitative values.

Item URL in elib:https://elib.dlr.de/197845/
Document Type:Article
Title:Large-Amplitude Gusts on the NASA Common Research Model
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Friedewald, DilianaUNSPECIFIEDhttps://orcid.org/0000-0002-5591-2459UNSPECIFIED
Date:9 June 2023
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:NASA Common Research Model, CFD, URANS, Gust, Unsteady Nonlinear Aerodynamics, Transonic Flow
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
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Friedewald, Diliana
Deposited On:06 Oct 2023 11:05
Last Modified:30 Jan 2024 10:54

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