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Assessment of the mesh refinement influence on the computed flow-fields about a model train in comparison with wind tunnel measurements

Assessment of the mesh refinement influence on the computed flow-fields about a model train in comparison with wind tunnel measurements
Assessment of the mesh refinement influence on the computed flow-fields about a model train in comparison with wind tunnel measurements
A consistent mesh refinement study, relating to the prediction of aerodynamic forces about an experimentally validated reference train geometry, is presented in this paper. The flow about a high-speed train has a multi-scale character which poses challenges for the design of computationally effective meshes. The purpose of this study is to assist in the development of guidelines for effective drag prediction of high-speed trains using numerical simulation. These guidelines should assist CFD practitioners by identifying the regions of the mesh that are critical for the correct estimation of drag as well as providing information on appropriate mesh characteristics, such as volume and surface element length scales. Numerical assessments are validated against an experimental drag measurement program and the extent to which RANS is sufficiently predictive for industrial design is discussed. The results obtained in the work suggest that the mesh about the train nose is essential for the proper assessment of the aerodynamic drag acting on the vehicle.
aerodynamic drag, mesh refinement, mesh sensitivity, PIV
0167-6105
102-117
Weinman, K.A.
dcbc2be5-2d14-4edb-9b2f-97c5b98f6cb3
Fragner, M.M.
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Deiterding, R.
ce02244b-6651-47e3-8325-2c0a0c9c6314
Heine, D.
96a61aba-c3dc-4ac2-a02b-067a15567d3f
Fey, U.
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Braenstroem, F.
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Schultz, B.
50517c5f-03b7-46cb-abc2-a49a5636236c
Wagner, C.
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Weinman, K.A.
dcbc2be5-2d14-4edb-9b2f-97c5b98f6cb3
Fragner, M.M.
3abd27e2-df7d-4087-90cb-8fbcc0b99658
Deiterding, R.
ce02244b-6651-47e3-8325-2c0a0c9c6314
Heine, D.
96a61aba-c3dc-4ac2-a02b-067a15567d3f
Fey, U.
71d495fc-cc73-475b-b9ef-83db4691436c
Braenstroem, F.
71d44176-d058-421a-9069-5b5503273985
Schultz, B.
50517c5f-03b7-46cb-abc2-a49a5636236c
Wagner, C.
6c3a050d-6d87-45b9-953d-9b46ddb6ffdc

Weinman, K.A., Fragner, M.M., Deiterding, R., Heine, D., Fey, U., Braenstroem, F., Schultz, B. and Wagner, C. (2018) Assessment of the mesh refinement influence on the computed flow-fields about a model train in comparison with wind tunnel measurements. Journal of Wind Engineering and Industrial Aerodynamics, 179, 102-117. (doi:10.1016/j.jweia.2018.05.005).

Record type: Article

Abstract

A consistent mesh refinement study, relating to the prediction of aerodynamic forces about an experimentally validated reference train geometry, is presented in this paper. The flow about a high-speed train has a multi-scale character which poses challenges for the design of computationally effective meshes. The purpose of this study is to assist in the development of guidelines for effective drag prediction of high-speed trains using numerical simulation. These guidelines should assist CFD practitioners by identifying the regions of the mesh that are critical for the correct estimation of drag as well as providing information on appropriate mesh characteristics, such as volume and surface element length scales. Numerical assessments are validated against an experimental drag measurement program and the extent to which RANS is sufficiently predictive for industrial design is discussed. The results obtained in the work suggest that the mesh about the train nose is essential for the proper assessment of the aerodynamic drag acting on the vehicle.

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Accepted/In Press date: 12 May 2018
e-pub ahead of print date: 28 May 2018
Published date: 1 August 2018
Keywords: aerodynamic drag, mesh refinement, mesh sensitivity, PIV

Identifiers

Local EPrints ID: 420988
URI: http://eprints.soton.ac.uk/id/eprint/420988
ISSN: 0167-6105
PURE UUID: 6b140c18-98d6-455f-ae02-bffa95600a13
ORCID for R. Deiterding: ORCID iD orcid.org/0000-0003-4776-8183

Catalogue record

Date deposited: 21 May 2018 16:30
Last modified: 26 Nov 2021 05:11

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Contributors

Author: K.A. Weinman
Author: M.M. Fragner
Author: R. Deiterding ORCID iD
Author: D. Heine
Author: U. Fey
Author: F. Braenstroem
Author: B. Schultz
Author: C. Wagner

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