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Time Domain Flutter Simulations of a Steam Turbine Stage Using Sptectral 2D Non-Reflecting Boundary Conditions

Schlüß, Daniel and Frey, Christian (2018) Time Domain Flutter Simulations of a Steam Turbine Stage Using Sptectral 2D Non-Reflecting Boundary Conditions. 15th International Symposium on Unsteady Aerodynamics, Aeroacoustics & Aeroelasticity of Turbomachines (ISUAAAT15), 24-27. Sep. 2018, Oxford.

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Abstract

In this paper, we show the application of spectral twodimensional non-reflecting boundary conditions (NRBC) in unsteady time domain simulations of three-dimensional turbomachinery flows. For this purpose, we conduct flutter simulations of a steam turbine stage and study the impact of the boundary condition formulation as well as of the boundary location on the prediction of aeroelastic properties. The main outcome is that spectral NRBC can be applied in challenging time domain simulations of realistic unsteady turbomachinery flows. Their reflection properties are shown to be superior to characeristic one-dimensional NRBC which significantly improves the prediction of aeroelastic quantities. In contrast to a prior implementation of spectral NRBC by the authors, convergence issues or a massive increase in computational costs, which would restrict the practical applicabilty of the spectral NRBC, do not occur.

Item URL in elib:https://elib.dlr.de/126161/
Document Type:Conference or Workshop Item (Speech)
Title:Time Domain Flutter Simulations of a Steam Turbine Stage Using Sptectral 2D Non-Reflecting Boundary Conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schlüß, DanielDaniel.Schluess (at) dlr.dehttps://orcid.org/0000-0001-7559-2264
Frey, ChristianChristian.Frey (at) dlr.deUNSPECIFIED
Date:24 June 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Non-Reflecting Boundary Conditions, Flutter, Unsteady Aerodynamics, Aeroelasticity, CFD
Event Title:15th International Symposium on Unsteady Aerodynamics, Aeroacoustics & Aeroelasticity of Turbomachines (ISUAAAT15)
Event Location:Oxford
Event Type:international Conference
Event Dates:24-27. Sep. 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Deposited By: Schlüß, Daniel
Deposited On:23 Jan 2019 15:35
Last Modified:31 Jul 2019 20:24

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