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Numerical Simulations on Unsteady Nonlinear Transonic Airfoil Flow

Friedewald, Diliana (2020) Numerical Simulations on Unsteady Nonlinear Transonic Airfoil Flow. Aerospace, 8 (1), pp. 1-25. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/aerospace8010007. ISSN 2226-4310.

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Official URL: https://www.mdpi.com/2226-4310/8/1/7

Abstract

Large-amplitude excitations need to be considered for gust load analyses of transport aircraft in cruise flight conditions. Nonlinear amplitude effects in transonic flow are, however, only little taken into account. The present work aims at closing this gap by means of systematic unsteady Reynolds-averaged Navier-Stokes simulations. The RAE2822 airfoil is analyzed for a variety of sinusoidal gust excitations at different transonic Mach numbers. Responses are evaluated with respect to lift and moment coefficients, their derivatives and the unsteady shock motion. A strong dependency on inflow Mach number and excitation frequency is observed. Generally, amplitude effects decrease with lower Mach numbers or higher excitation frequencies. The unsteady nonlinear simulations predict lower maximum lift values and lower lift and moment derivatives compared to their linear counterparts for lower frequencies in combination with large-amplitude excitations. For the mid-frequency range, trends are not as clear. Additionally, it is shown that the variables of harmonic distortion and maximum shock motion might not be reasonable indicators to predict a nonlinear response.

Item URL in elib:https://elib.dlr.de/139783/
Document Type:Article
Title:Numerical Simulations on Unsteady Nonlinear Transonic Airfoil Flow
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Friedewald, DilianaDiliana.Friedewald (at) dlr.dehttps://orcid.org/0000-0002-5591-2459
Date:29 December 2020
Journal or Publication Title:Aerospace
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:8
DOI :10.3390/aerospace8010007
Page Range:pp. 1-25
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
Series Name:Special Issue "Modelling of Aircraft Unsteady and Nonlinear Aerodynamics"
ISSN:2226-4310
Status:Published
Keywords:CFD, URANS, transonic flow, nonlinear aerodynamics, gust response, shock motion
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation (old), L - Flight Physics (old)
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Friedewald, Diliana
Deposited On:11 Jan 2021 14:10
Last Modified:06 Oct 2021 15:52

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