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Fluid-mode flutter in plane transonic flows

Nitzsche, Jens and Ringel, Lisa Maria and Kaiser, Christoph and Hennings, Holger (2019) Fluid-mode flutter in plane transonic flows. In: International Forum on Aeroelasticity and Structural Dynamics 2019, IFASD 2019. IFASD 2019 – International Forum on Aeroelasticity and Structural Dynamics, 09.-13. Juni 2019, Savannah, GA (USA).

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Abstract

We investigate the flutter behavior of 1) a typical-section OAT15A airfoil with a heave and a pitch degree of freedom and 2) a generic symmetric airfoil of variable thickness equipped with a flexible trailing-edge plate by means of RANS simulations. The linearized flutter stability problem in the pre-buffet region is approached with three different techniques: A Newton-based root search involving the p-k approximation (NPK), a rational function approximation (RFA) of the fluid-structure coupled frequency response and a time-domain eigenvalue identification on the coupled impulse response obtained via succesive convolution (SCM). We emphasize on flutter instabilities resulting from the coupling of a structural mode and a fluid mode in separated flow. We conclude that the buffet onset should be regarded as the flutter boundary in the limiting case of zero density and buffeting is essentially flutter.

Item URL in elib:https://elib.dlr.de/127989/
Document Type:Conference or Workshop Item (Speech)
Title:Fluid-mode flutter in plane transonic flows
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Nitzsche, JensUNSPECIFIEDhttps://orcid.org/0000-0002-2742-7368UNSPECIFIED
Ringel, Lisa MariaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kaiser, ChristophUNSPECIFIEDhttps://orcid.org/0000-0001-9156-8352133666273
Hennings, HolgerUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:10 June 2019
Journal or Publication Title:International Forum on Aeroelasticity and Structural Dynamics 2019, IFASD 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Status:Published
Keywords:unsteady aerodynamics, transonic buffet, fluid-mode flutter, flow separation, aerodynamic resonance, p-k method
Event Title:IFASD 2019 – International Forum on Aeroelasticity and Structural Dynamics
Event Location:Savannah, GA (USA)
Event Type:international Conference
Event Dates:09.-13. Juni 2019
Organizer:AIAA
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 - Flight Physics (old), L - VicToria (old), L - Structures and Materials (old), L - Simulation and Validation (old), L - no assignment
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity > Aeroelastic Simulation
Deposited By: Nitzsche, Jens
Deposited On:24 Jun 2019 15:52
Last Modified:24 Apr 2023 15:02

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