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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. IFASD 2019 – International Forum on Aeroelasticity and Structural Dynamics, 09.-13. Juni 2019, Savannah, GA (USA).

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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
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Nitzsche, JensJens.Nitzsche (at) dlr.dehttps://orcid.org/0000-0002-2742-7368
Kaiser, ChristophChristoph.Kaiser (at) dlr.dehttps://orcid.org/0000-0001-9156-8352
Hennings, Holgerholger.hennings (at) dlr.deUNSPECIFIED
Date:10 June 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
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
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:20 Jun 2021 15:52

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