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Time domain implementation of a spectral non-reflecting boundary condition for unsteady turbomachinery flows

Schlüß, Daniel and Frey, Christian (2019) Time domain implementation of a spectral non-reflecting boundary condition for unsteady turbomachinery flows. 24th ISABE Conference, 22.-27. Sep. 2019, Canberra, Australien.

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Abstract

We show the implementation of a spectral, non-reflecting boundary condition (NRBC) for time marching, unsteady simulations of flows in turbomachinery com- ponents. It is well known that reflections from artificial boundaries can impair the prediction of unsteady flow phenomena. In the context of turbomachinery flows, some frequency domain methods address this issue by means of spectral NRBC. Since these NRBC are non-local in space and time, their implementation in time domain solvers is not straightforward. We elaborate on these difficulties and on how we deal with them. Applications of the NRBC to a two-dimensional flutter configuration and to the prediction of rotor-stator interactions of a real fan configuration are shown. The most important feature of the presented method is the combination of increased robustness and good reflection properties.

Item URL in elib:https://elib.dlr.de/132881/
Document Type:Conference or Workshop Item (Speech)
Title:Time domain implementation of a spectral non-reflecting boundary condition for unsteady turbomachinery flows
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schlüß, DanielDaniel.Schluess (at) dlr.dehttps://orcid.org/0000-0001-7559-2264
Frey, ChristianChristian.Frey (at) dlr.deUNSPECIFIED
Date:May 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Series Name:Proceedings of the 24th ISABE Conference
Status:Published
Keywords:Non-reflecting boundary conditions, Unsteady flows, CFD methods, Aeroelasticity, Aeroacoustics
Event Title:24th ISABE Conference
Event Location:Canberra, Australien
Event Type:international Conference
Event Dates:22.-27. Sep. 2019
Organizer:ISABE - International Society For Air Breathing Engines
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:17 Dec 2019 10:54
Last Modified:27 Jan 2020 07:11

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