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Time-Linearized and Time-Accurate 3D RANS Methods for Aeroelastic Analysis in Turbomachinery

Frey, Christian and Kersken, Hans-Peter and Voigt, Christian and Ashcroft, Graham (2012) Time-Linearized and Time-Accurate 3D RANS Methods for Aeroelastic Analysis in Turbomachinery. Journal of Turbomachinery, 134 (5). American Society of Mechanical Engineers (ASME). doi: 10.1115/1.4004749. ISSN 0889-504X.

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Official URL: http://dx.doi.org/10.1115/1.4004749


Graham Ashcroft Institute of Propulsion Technology, German Aerospace Center (DLR), Linder Höhe, 51147 Cologne, Germany A computational method for performing aeroelastic analysis using either a time-linearized or an unsteady time-accurate solver for the compressible Reynolds averaged Navier--Stokes (RANS) equations is described. The time-linearized solver employs the assumption of small time-harmonic perturbations and is implemented via finite differences of the nonlinear flux routines of the time-accurate solver. The resulting linear system is solved using a parallelized generalized minimal residual (GMRES) method with block-local preconditioning. The time accurate solver uses a dual time stepping algorithm for the solution of the unsteady RANS equations on a periodically moving computational grid. For either solver, and both flutter and forced response problems, a mapping algorithm has been developed to map structural eigenmodes, obtained from finite element structural analysis, from the surface mesh of the finite element structural solver to the surface mesh of the finite volume flow solver. Using the surface displacement data an elliptic mesh deformation algorithm, based on linear elasticity theory, is then used to compute the grid deformation vector field. The developed methods are validated first using standard configuration 10. Finally, for an ultra-high bypass ratio fan, the results of the time-linearized and the unsteady module are compared. The gain in prediction time using the linearized methods is highlighted.

Item URL in elib:https://elib.dlr.de/80400/
Document Type:Article
Title:Time-Linearized and Time-Accurate 3D RANS Methods for Aeroelastic Analysis in Turbomachinery
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Frey, Christianchristian.frey (at) dlr.deUNSPECIFIED
Kersken, Hans-Peterhans-peter.kerksen (at) dlr.deUNSPECIFIED
Voigt, Christianchristian.voigt (at) dlr.deUNSPECIFIED
Ashcroft, Grahamgraham.ashcroft (at) dlr.deUNSPECIFIED
Date:September 2012
Journal or Publication Title:Journal of Turbomachinery
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1115/1.4004749
Publisher:American Society of Mechanical Engineers (ASME)
Keywords: Aeroelasticity, time-linearized RANS, unsteady RANS, CFD
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
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
Institute of Propulsion Technology
Deposited By: Kersken, Dr.rer.nat. Hans-Peter
Deposited On:14 Jan 2013 07:52
Last Modified:08 Mar 2018 18:46

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