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Consistent non-refleflecting boundary conditions for both steady and unsteady flow simulations in turbomachinery applictations

Schlüß, Daniel and Frey, Christian and Ashcroft, Graham (2016) Consistent non-refleflecting boundary conditions for both steady and unsteady flow simulations in turbomachinery applictations. In: Proceedings of the 7th Europ. VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016), 05.-10. Juni 2016, Kreta, Griechenland.

Full text not available from this repository.

Official URL: https://eccomas2016.org/proceedings/pdf/5411.pdf

Abstract

This paper presents the implementation of a non-reflecting boundary condition for steady and unsteady turbomachinery flow computations. Here, the truncation of the computational domain can lead to spurious numerical reflections due to artificial open boundary surfaces. To face this issue, Giles introduces a popular set of non-reflecting boundary conditions for turbomachinery applications. Whereas the steady formulation is exact within the linearisation approach, Giles suggests an approximate boundary condition for unsteady simulations. Resulting from this approximation, the unsteady boundary conditions are not perfectly non-reflecting. Thus, steady and time averaged unsteady flow solutions do not necessarily coincide, even if the flow field contains no unsteadiness. We suggest a single boundary condition formulation suitable for steady and unsteady simulations. This approach applies a modal decomposition and, thus, undesired incoming modes can easily be ruled out. Steady modes can be handled as in the steady case. Apart from the assumptions made by starting from the linearised, two-dimensional Euler equations, this ap- proach does not require any further approximation, and, therefore, the time-averaged unsteady and the steady solutions coincide in the limit of steady flows. We apply and assess the presented boundary condition in steady and unsteady computations of two turbomachinery test cases.

Item URL in elib:https://elib.dlr.de/111626/
Document Type:Conference or Workshop Item (Speech)
Title:Consistent non-refleflecting boundary conditions for both steady and unsteady flow simulations in turbomachinery applictations
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
Ashcroft, GrahamGraham.Ashcroft (at) dlr.deUNSPECIFIED
Date:June 2016
Journal or Publication Title:Proceedings of the 7th Europ
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Papadrakakis, M.UNSPECIFIED
Papadopoulos, V.UNSPECIFIED
Stefanou, G.UNSPECIFIED
Plevris, V.UNSPECIFIED
Status:Published
Keywords:Non-Reflecting Boundary Conditions, Turbomachinery, Steady and Unsteady CFD
Event Title:VII European Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS Congress 2016)
Event Location:Kreta, Griechenland
Event Type:international Conference
Event Dates:05.-10. Juni 2016
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, E - Gas Turbine (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Deposited By: Schlüß, Daniel
Deposited On:27 Mar 2017 07:24
Last Modified:27 Mar 2017 07:24

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