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On the Simulation of Unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine Part I: Verification and Validation

Ashcroft, Graham and Frey, Christian and Kersken, Hans-Peter and Kügeler, Edmund and Wolfrum, Nina (2018) On the Simulation of Unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine Part I: Verification and Validation. In: Proceedings of the ASME Turbo Expo. ASME Turbo Expo 2018, 11.-15. Juni 2018, Oslo, Norwegen.

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Abstract

This is the first part of a series of three papers on the simulation of turbulence and transition effects in a multistage low pressure turbine. In this first part, the extension, verification and validation of a Harmonic Balance (HB) method recently proposed by the authors to fully include established turbulence and transition models in the method is presented. As an alternating frequency/time-domain type method the implemented HB solver has the advantage of being able to utilize models (e.g. boundary conditions or residual functions) formulated in either the frequency or time domain. On the one hand this allows highly accurate nonreflecting boundary conditions formulated in the frequency domain to be used along entry, exit or Interface boundaries, and on the other hand complex nonlinear terms formulated in the time domain to be used to describe nonlinear effects. Nevertheless, the wish to minimize the number of harmonics used to describe a given time periodic unsteady flow, coupled with the often highly nonlinear nature of turbulence and transition models makes the full inclusion of such models in the HB method challenging. In this work the integration of Menter’s SST two-equation k − w turbulence model along with Menter and Langtry’s two-equation gamma − ReTheta transition model in the context of a general framework for transport equations in the CFD solver TRACE is described in detail. Following the basic verification of the underlying transport equation framework, the implemented models are used to compute the well known high lift, low pressure turbine airfoil T106C and results are compared with the available experimental data as well as results from more conventional time-domain simulations. Alongside the basic validation of the models this testcase is furthermore used to investigate the importance of including higher harmonics, as opposed to only the zeroth harmonic, of the turbulence and transition models for the accurate prediction of the time-mean flow.

Item URL in elib:https://elib.dlr.de/120514/
Document Type:Conference or Workshop Item (Speech)
Title:On the Simulation of Unsteady Turbulence and Transition Effects in a Multistage Low Pressure Turbine Part I: Verification and Validation
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Ashcroft, GrahamGraham.Ashcroft (at) dlr.deUNSPECIFIED
Frey, ChristianChristian.Frey (at) dlr.deUNSPECIFIED
Kersken, Hans-PeterHans-Peter.Kersken (at) dlr.deUNSPECIFIED
Kügeler, EdmundEdmund.Kuegeler (at) dlr.deUNSPECIFIED
Wolfrum, NinaMTU Aero Engines GmbHUNSPECIFIED
Date:June 2018
Journal or Publication Title:Proceedings of the ASME Turbo Expo
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Status:Published
Keywords:Harmonic Balance, Turbulence, Transition, Unsteady
Event Title:ASME Turbo Expo 2018
Event Location:Oslo, Norwegen
Event Type:international Conference
Event Dates:11.-15. Juni 2018
Organizer:ASME
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
Institute of Propulsion Technology > Fan and Compressor
Institute of Propulsion Technology > Turbine
Institute of Propulsion Technology > Engine Acoustic
Deposited By: Ashcroft, Dr.(PH.D.) Graham
Deposited On:10 Jul 2018 08:49
Last Modified:10 Jul 2018 08:49

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