Numerical Capture and Validation of a Massively Separated Bluff-Body Wake

Tan, K. J. B., Hesse, H. and Wang, P. C. (2020) Numerical Capture and Validation of a Massively Separated Bluff-Body Wake. In: AIAA Aviation 2020 Forum, 15-19 Jun 2020, ISBN 9781624105982 (doi:10.2514/6.2020-2713)

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Abstract

A flow over a bluff-body is numerically investigated and validated using a Detached-Eddy Simulation (DES) technique at Re=21,400. An incompressible solver that is nominally second-order accurate employing an implicit constant backward time-stepping scheme with blended upwind-central differencing spatial discretization is used to study the massively separated wake that is generated. Measurements are taken up to 6 downstream characteristic lengths, evaluating the wake time-averaged first- and second-moment statistics alongside near-wall boundary layer quantities and surface-force integrals. Results advocate the use of DES methods, which are found to be significantly more accurate for capturing wake statistics, compared to two different Reynolds-Averaged (RANS) models calibrated with an identical grid. Although comparative accuracy can be obtained with the RANS techniques for the boundary layer and surface-forces, these techniques are unsuitable for modeling wake statistics as they are inherently dissipative, evident through early velocity recovery when evaluated against experimental data.

Item Type:Conference Proceedings
Additional Information:The work is funded through the Industrial Postgraduate Programme scholarship by the Economic Development Board of Singapore, in partnership between AviationLearn Pte. Ltd. and the University of Glasgow Singapore.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Tan, Benjamin and Hesse, Dr Henrik and Wang, Mr Peng Cheng
Authors: Tan, K. J. B., Hesse, H., and Wang, P. C.
College/School:College of Science and Engineering > School of Engineering
ISBN:9781624105982
Published Online:08 June 2020
Copyright Holders:Copyright © 2020 American Institute of Aeronautics
First Published:First published in Proceedings of AIAA Aviation 2020 Forum
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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