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Numerical Simulation of Train-Tunnel Entry Using a BEM in Time Domain

Wagner, Sebastian and Ehrenfried, Klaus and Dillmann, Andreas (2013) Numerical Simulation of Train-Tunnel Entry Using a BEM in Time Domain. In: New Results in Numerical and Experimental Fluid Mechanics VIII Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 121. Springer Verlag, Heidelberg New York Dordrecht London. pp. 739-746. ISBN 978-3-642-35679-7. ISSN 1612-2909

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Official URL: http://link.springer.com/chapter/10.1007/978-3-642-35680-3_88

Abstract

The compression wave generated when a high-speed train enters a tunnel at Mach numbers smaller than 0.4 can be described in good approximation by a linear theory of a inviscid compressible fluid. The wave equation for the acoustic potential becomes the governing equation. It is solved by a three dimensional boundary element method in time domain which forces a vanishing normal component of the velocity at the tunnel wall. It is assumed that the elements are compact in time. This leads to a linear equation in which a special matrix-vector multiplication has to be evaluated for every time-step. The aim is to create a fast method which sets as few constraints on the geometry as possible while still beeing accurate enough to be used as a first estimate of the occuring wave propagation. In a first step the elements are assumed to be rectangles and a cylinder of finite length with infinitely thin walls is taken as the geometry of the tunnel. The train is modeled by a single moving mass source of monopole type. It defines a semi-infinite body whose shape slightly changes when entering the tunnel. The results of this simple model along with the comparison with analytical solutions and experimental data are shown and discussed.

Item URL in elib:https://elib.dlr.de/81274/
Document Type:Contribution to a Collection
Title:Numerical Simulation of Train-Tunnel Entry Using a BEM in Time Domain
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Wagner, SebastianSebastian.Wagner (at) dlr.deUNSPECIFIED
Ehrenfried, Klausklaus.ehrenfried (at) dlr.deUNSPECIFIED
Dillmann, Andreasandreas.dillmann (at) dlr.deUNSPECIFIED
Date:2013
Journal or Publication Title:New Results in Numerical and Experimental Fluid Mechanics VIII
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:121
DOI :10.1007/978-3-642-35680-3_88
Page Range:pp. 739-746
Editors:
EditorsEmail
Dillmann, AndreasDLR
Heller, GerdAirbus Deutschland, Bremen, Germany
Kreplin, Hans-PeterDLR
Nitsche, WolfgangTU Berlin, Berlin, Germany
Peltzer, InkenBeechcraft Berlin aviation GmbH, Schönefeld, Germany
Publisher:Springer Verlag, Heidelberg New York Dordrecht London
Series Name:Notes on Numerical Fluid Mechanics and Multidisciplinary Design
ISSN:1612-2909
ISBN:978-3-642-35679-7
Status:Published
Keywords:Boundary Element Method (BEM), Train-Tunnel Entry, Numerical Simulation, Pressure Wave
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 - Projekt Next Generation Train (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Leitungsbereich AS GO
Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Wagner, Sebastian
Deposited On:15 Apr 2013 14:48
Last Modified:24 Apr 2015 09:32

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