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Mode decomposition of flow structures in the wake of two high-speed trains
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering.ORCID iD: 0000-0002-9061-4174
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2012 (English)In: Civil-Comp Proceedings, ISSN 1759-3433, Vol. 98Article in journal (Refereed) Published
Abstract [en]

Two different train geometries, the Aerodynamic Train Model (ATM) and the CRH1, are studied in order to compare the flow structures in the wake. The flow is simulated with Detached Eddy-Simulation and then decomposed into modes with Proper Orthogonal Decomposition. This study has found that the flow structures are indeed different for the two train models although the tails are rather similar. For the CRH1 the dominant flow structures twist one of the counter-rotating vortices and leaves the other straight. The convergence of the modes are investigated and it is shown that approximately the same number of snapshots are needed for both trains. 

Place, publisher, year, edition, pages
Civil-Comp Press , 2012. Vol. 98
Keywords [en]
Aerodynamic train model, CRH1, Detached eddy simulation, Proper orthogonal decomposition, Slipstream, Train aerodynamics, Aerodynamics, Flow separation, Principal component analysis, Railroad cars, Railroad transportation, Railroads, Wakes, Detached eddy simulations, Proper orthogonal decompositions, Train model, Flow structure
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-261556DOI: 10.4203/ccp.98.156Scopus ID: 2-s2.0-85068369448OAI: oai:DiVA.org:kth-261556DiVA, id: diva2:1360506
Note

QC 20191014

Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2019-10-14Bibliographically approved

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Efraimsson, Gunilla

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Muld, Toma. W.Efraimsson, GunillaHenningson, D. S.
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