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Adjoint-Based Shape Optimization of High-Speed Trains

Jakubek, Daria and Herzog, Sebastian and Wagner, Claus (2014) Adjoint-Based Shape Optimization of High-Speed Trains. 4th International Conference of Engineering Optimization, 08. - 11. Sept. 2014, Lisbon, Portugal. ISBN 978-989-96276-6-6.

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Official URL: http://www.dem.ist.utl.pt/engopt2014/


Given the operating speeds of modern high-speed trains, the improvement of aerodynamic performance has, by implication, become one of the most important issues in today's railway engineering. Many of the interesting aerodynamic features can be described by a set of objective functions which can be determined numerically using Computational Fluid Dynamics (CFD). Moreover, CFD can also be used to optimize the shape of a train with respect to one or several objective functions. Consequently, numerical shape optimization can significantly reduce the demand of time consuming and expensive wind tunnel experiments and speed up or even partly automate the design and optimization process. There are different ways to determine the required shape modifications leading to improved aerodynamic performance. In numerical aerodynamics, shape optimization with adjoint methods is based upon sensitivity analysis providing sensitivities on the surface of the investigated object. Sensitivities themselves are gradients, calculated from the flow field predicted by solving the Reynolds-averaged Navier-Stokes (RANS) equations and the corresponding adjoint equations. For each element of a discretized surface, the sensitivities indicate the influence of a surface-normal displacement of the cell center on the considered objective function. In cases aiming for the minimization (or maximization) of certain aerodynamic characteristics (e.g. drag or lift), the sensitivity distribution almost directly provides the necessary changes. Properly smoothed and scaled, in conjunction with the surface normal vectors of the surface cells, they can be used to identify the deformation vectors.

Item URL in elib:https://elib.dlr.de/93811/
Document Type:Conference or Workshop Item (Speech)
Title:Adjoint-Based Shape Optimization of High-Speed Trains
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Series Name:Book of Abstracts of the 4th International Conference of Engineering Optimization
Keywords:CFD, adjoint optimization, mesh morphing, NGT
Event Title:4th International Conference of Engineering Optimization
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:08. - 11. Sept. 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:19 Dec 2014 16:18
Last Modified:19 Dec 2014 16:18

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