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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. Engineering Optimization, IV. CRC Press, Taylor & Francis Group, London. ISBN 978-1-138-02725-1.

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Official URL: http://www.crcnetbase.com/doi/abs/10.1201/b17488-124

Abstract

Following Othmer’s work (2008) on the continuous adjoint formulation for the computation of sensitivities of incompressible, steady-state, ducted flows, we use the continuous approach for the optimization of external flows around high-speed trains and the open source finite volume solver OpenFOAM (2011) to solve the governing primal and adjoint equations. For solving the primal Reynolds-Averaged Navier-Stokes (RANS)- equations a k-ω two-equation eddy-viscosity and a one-equation turbulence model were used. The solutions of the primal and the adjoint equations are used to calculate surface sensitivities. The results of the sensitivity analysis are transferred onto the surveyed geometry to create a new shape for further investigation. To obtain the new geometry, we use a CAD-free deformation procedure to morph the existing computational mesh instead of rerunning the entire process chain of CAD design and mesh generation. Following the approach of de Boer et al. (2007) and Bos (2009) we have developed a morphing tool using radial basis function interpolation and the OpenFOAM library to filter the sensitivities and to calculate the new positions of the surface and grid points. The focus of this study is to explore how far adjoint-based shape optimization, using the continuous approach, in conjunction with filtered gradients and CAD-free mesh morphing based on radial basis function interpolation, is capable of meeting the requirements of aerodynamic train design. The presented results considering shape optimization of high-speed trains with respect to the generated pressure wave and aerodynamic drag reveal the feasibility and capability of the developed process chain.

Item URL in elib:https://elib.dlr.de/93813/
Document Type:Proceedings
Additional Information:Citation Information: Engineering Optimization 2014, Edited by Aurelio Araujo, CRC Press 2014, eBook ISBN: 978-1-315-73210-7
Title:Adjoint-based shape optimization of high-speed trains
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Jakubek, Dariadaria.jakubek (at) dlr.deUNSPECIFIED
Herzog, Sebastiansebastian.herzog (at) dlr.deUNSPECIFIED
Wagner, Clausclaus.wagner (at) dlr.deUNSPECIFIED
Date:2014
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:IV
DOI :10.1201/b17488-124
Page Range:pp. 699-704
Editors:
EditorsEmail
Rodrigues, H.C.LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
Herskovits, J.COPPE, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
Mota Soares, C.M.LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
Guedes, J.M.LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
Araújo, A.L.LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
Folgado, J.O.LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal
Moleiro, F.LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal and ISEL – Instituto Superior de Engenharia de Lisboa, Lisbon, Portugal
Madeira, J.F.A.LAETA, IDMEC, Instituto Superior Técnico, Universidade de Lisboa, Lisbon, Portugal and ISEL – Instituto Superior de Engenharia de Lisboa, Lisbon, Portugal
Publisher:CRC Press, Taylor & Francis Group, London
Series Name:Engineering Optimization
ISBN:978-1-138-02725-1
Status:Published
Keywords:CFD, adjoint optimization, mesh morphing, NGT
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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