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Coupled Simulation of flow-structure interaction in turbomachinery

Carstens, V. and Kemme, R. and Schmitt, S. (2002) Coupled Simulation of flow-structure interaction in turbomachinery. 4th ONERA-DLR Aerospace Symposium (ODAS), Cologne, Germany, June 13.-14. 2002.

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The aeroelastic behaviour of vibrating blade assemblies is usually investigated in the frequency domain where the determination of aeroelastic stability boundaries is separated from the computation of linearized unsteady aerodynamic forces. However, nonlinear fluid-structure interaction caused by oscillating shocks or strong flow separation may significantly influence the aerodynamic damping and hence effect a shift of stability boundaries. In order to investigate such aeroelastic phenomena, the governing equations of structural and fluid motion have to be simultaneously integrated in time. In this paper a technique is presented which analyses the flutter behaviour of turbomachinery bladings in the time domain. The structural part of the governing aeroelastic equations is time-integrated according to the algorithm of Newmark, while the unsteady airloads are computed at every time step by a Navier-Stokes code. The link between the two time integrations is an automatic grid generation in which the used mesh is dynamically deformed so that it conforms with the deflected blades at every time step. The computed time series of the aeroelastic simulation of an assembly of highly loaded compressor blades vibrating freely in transonic flow are presented. The energy transfer between fluid and structure is here dominated by vibrating shocks and shock-boundary layer interaction. It is investigated if the predicted aeroelastic stability boundaries differ from those of a linearised method.

Item URL in elib:https://elib.dlr.de/14346/
Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=2002,
Title:Coupled Simulation of flow-structure interaction in turbomachinery
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:aeroelastic stability, fluid-structure interaction, time domain method, transonic compressor rotor
Event Title:4th ONERA-DLR Aerospace Symposium (ODAS), Cologne, Germany, June 13.-14. 2002
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:no assignment
DLR - Research theme (Project):UNSPECIFIED
Location: Göttingen
Institutes and Institutions:Institute of Aeroelasticity
Deposited By: Erdmann, Daniela
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 21:44

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