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Nonreflecting Boundary Conditions For Aeroelastic Analysis In Time and Frequency Domain 3D RANS Solvers

Kersken, Hans-Peter and Frey, Christian and Ashcroft, Graham and Wolfrum, Nina and Korte, Detlef (2014) Nonreflecting Boundary Conditions For Aeroelastic Analysis In Time and Frequency Domain 3D RANS Solvers. In: Proceedings of ASME Turbo Expo 2014, GT2014-25499. ASME Turbo Expo 2014, 16.-20. Juni 2014, Düsseldorf, Deutschland.

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This paper describes the implementation of a set of nonreflecting boundary conditions of increasing approximation quality for time-accurate and time-linearized 3D RANS solvers in the time and frequency domain. The implementations are based on the computation of eigenfunctions, either analytically or numerically, of the linearized Euler or Navier-Stokes equations for increasingly complex background flows. This results in a hierarchy of nonreflecting boundary conditions based on 1D characteristics, 2D circumferential mode decomposition, and 3D circumferential and radial mode decomposition, including viscous effects in the latter, for the frequency domain solver. By applying a Fourier transform in time at the boundaries the frequency domain implementations can be employed in the time-accurate time domain solvers as well. The limitations of each approximation are discussed and it is shown that increasing the precision of the boundary treatment the nonreflecting property of the boundary conditions is preserved for more complex flows without incurring an excessive increase in computing time. Results of a flutter analysis of a low pressure turbine blade obtained by time and frequency domain simulations are validated against each other and against reference results obtained with a 3D Euler frequency domain solver. The comparison of the results for different boundary conditions reveals the importance of using high quality boundary conditions.

Item URL in elib:https://elib.dlr.de/90475/
Document Type:Conference or Workshop Item (Speech)
Title:Nonreflecting Boundary Conditions For Aeroelastic Analysis In Time and Frequency Domain 3D RANS Solvers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Kersken, Hans-Peterhans-peter.kersken (at) dlr.deUNSPECIFIED
Frey, Christianchristian.frey (at) dlr.deUNSPECIFIED
Ashcroft, Grahamgraham.ashcroft (at) dlr.deUNSPECIFIED
Wolfrum, NinaMTU Aero Engines GmbHUNSPECIFIED
Korte, DetlefMTU Aero EnginesUNSPECIFIED
Date:June 2014
Journal or Publication Title:Proceedings of ASME Turbo Expo 2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:GT2014-25499
Keywords:Nonreflecting boundary conditions, Turbomachinery, Aeroelasticity
Event Title:ASME Turbo Expo 2014
Event Location:Düsseldorf, Deutschland
Event Type:international Conference
Event Dates:16.-20. Juni 2014
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 (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Deposited By: Kersken, Dr.rer.nat. Hans-Peter
Deposited On:08 Sep 2014 07:13
Last Modified:08 Sep 2014 07:13

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