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 , 11.-15. June 2012, Copenhagen, Denmark.
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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.
|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|
|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 Dates:||11.-15. June 2012|
|HGF - Research field:||Energy, Aeronautics, Space and Transport|
|HGF - Program:||no assignment, Aeronautics|
|HGF - Program Themes:||E - no assignement, L - no assignement|
|DLR - Research area:||Energy, Aeronautics|
|DLR - Program:||E - no assignement, L - no assignement|
|DLR - Research theme (Project):||E -- no assignement, ["eprint_fieldopt_dlr_project_search_L000" not defined]|
|Institutes and Institutions:||Institute of Propulsion Technology > Numerical Methodes|
Institute of Propulsion Technology > Fan and Compressor
|Deposited By:||Jan Backhaus|
|Deposited On:||09 Jul 2012 09:37|
|Last Modified:||09 Jul 2012 09:37|
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