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Gradient Enhanced Surrogate Models Based on Adjoint CFD Methods for the Design of a Counter Rotating Turbofan

Backhaus, Jan and Aulich, Marcel and Frey, Christian and Lengyel, Timea and Voß, Christian (2012) Gradient Enhanced Surrogate Models Based on Adjoint CFD Methods for the Design of a Counter Rotating Turbofan. ASME Turbo Expo 2012 , 2012-06-11 - 2012-06-15, Copenhagen, Denmark. doi: 10.1115/GT2012-69706.

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This paper studies the use of adjoint CFD solvers in combination with surrogate modelling in order to reduce the computational cost of the optimization of complex 3D turbomachinery components. The method is applied to a previously optimized counter rotating turbofan, with a shape parameterized by 104 CAD parameters. Through random changes on the reference design, a small number of design variations are created to serve as training samples for the surrogate models. A steady RANS solver and its discrete adjoint are then used to calculate objective function values and their corresponding sensitivities. Kriging and neural networks are used to build surrogate models from the training data. To study the impact of the additional information provided by the adjoint solver, each model is trained with and without the sensitivity information. The accuracy of the different surrogate model predictions is assessed by comparison against CFD calculations. The results show a considerable improvement of the fitness function approximation when the sensitivity information is taken into account. Through a gradient based optimization on one of the surrogate models, a design with higher isentropic efficiency at the aerodynamic design point is created. This application demonstrates that the improved surrogate models can be used for design and optimization.

Item URL in elib:https://elib.dlr.de/76176/
Document Type:Conference or Workshop Item (Paper)
Title:Gradient Enhanced Surrogate Models Based on Adjoint CFD Methods for the Design of a Counter Rotating Turbofan
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:June 2012
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:Adjoint CFD, Counter Rotating Fan Design Optimization, Surrogate Modeling
Event Title:ASME Turbo Expo 2012
Event Location:Copenhagen, Denmark
Event Type:international Conference
Event Start Date:11 June 2012
Event End Date:15 June 2012
HGF - Research field:Energy, Aeronautics, Space and Transport
HGF - Program:other
HGF - Program Themes:E - no assignment, other
DLR - Research area:Energy, Aeronautics
DLR - Program:E - no assignment, L - no assignment
DLR - Research theme (Project):E - no assignment, L - no assignment (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Institute of Propulsion Technology > Fan and Compressor
Deposited By: Backhaus, Jan
Deposited On:09 Jul 2012 09:37
Last Modified:24 Apr 2024 19:42

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