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Time-linearized and Time-accurate 3D RANS Methods for Aeroelastic Analysis in Turbomachinery

Kersken, Hans-Peter and Frey, Christian and Voigt, Christian and Ashcroft, Graham (2010) Time-linearized and Time-accurate 3D RANS Methods for Aeroelastic Analysis in Turbomachinery. ASME TurboExpo 2010, 14.-18. Juni 2010, Glasgow, UK.

Full text not available from this repository.

Abstract

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 ten. Finally, for an ultra high bypass ratio fan the results of the timelinearized and the unsteady module are compared. The gain in prediction time using the linearized methods is highlighted.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Time-linearized and Time-accurate 3D RANS Methods for Aeroelastic Analysis in Turbomachinery
Authors:
AuthorsInstitution or Email of Authors
Kersken, Hans-Peterhans-peter.kersken@dlr.de
Frey, Christianchristian.frey@dlr.de
Voigt, Christianchristian.voigt@dlr.de
Ashcroft, Grahamgraham.ashcroft@dlr.de
Date:June 2010
Refereed publication:Yes
In ISI Web of Science:No
Status:Published
Keywords:Aeroelasticity, time-linearized RANS, unsteady RANS, CFD
Event Title:ASME TurboExpo 2010
Event Location:Glasgow, UK
Event Type:international Conference
Event Dates:14.-18. Juni 2010
Organizer:ASME
HGF - Research field:Aeronautics, Space and Transport (old)
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 > Numerical Simulation
Institute of Propulsion Technology > Numerical Methodes
Institut of Simulation and Software Technology
Institut of Simulation and Software Technology > Distributed Systems and Component Software
Deposited By: Dr.rer.nat. Hans-Peter Kersken
Deposited On:04 Aug 2010 08:17
Last Modified:04 Aug 2010 08:17

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