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Adjoint-Based Shape Optimization of High-Speed Trains

Jakubek, Daria und Herzog, Sebastian und Wagner, Claus (2014) Adjoint-Based Shape Optimization of High-Speed Trains. 4th International Conference of Engineering Optimization, 2014-09-08 - 2014-09-11, Lisbon, Portugal. ISBN 978-989-96276-6-6.

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

Kurzfassung

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.

elib-URL des Eintrags:https://elib.dlr.de/93811/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Adjoint-Based Shape Optimization of High-Speed Trains
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Jakubek, Dariadaria.jakubek (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Herzog, Sebastiansebastian.herzog (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Wagner, Clausclaus.wagner (at) dlr.dehttps://orcid.org/0000-0003-2273-0568NICHT SPEZIFIZIERT
Datum:2014
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Name der Reihe:Book of Abstracts of the 4th International Conference of Engineering Optimization
ISBN:978-989-96276-6-6
Status:veröffentlicht
Stichwörter:CFD, adjoint optimization, mesh morphing, NGT
Veranstaltungstitel:4th International Conference of Engineering Optimization
Veranstaltungsort:Lisbon, Portugal
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:8 September 2014
Veranstaltungsende:11 September 2014
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Bodengebundener Verkehr (alt)
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V BF - Bodengebundene Fahrzeuge
DLR - Teilgebiet (Projekt, Vorhaben):V - Next Generation Train III (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Fluidsysteme
Hinterlegt von: Micknaus, Ilka
Hinterlegt am:19 Dez 2014 16:18
Letzte Änderung:24 Apr 2024 19:59

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