Hassan, S, Molla, MM, Nag, P et al. (2 more authors) (2022) Unsteady RANS simulation of wind flow around a building shape obstacle. Building Simulation, 15 (2). pp. 291-312. ISSN 1996-3599
Abstract
This work aims to find the origin and connection of the surface, near-wake, and far-wake structures in the flow encompassing a high-rise building for a high Reynolds number. The origin and interconnection of the stream-wise tip vortices, with the other components of the wake, is analysed in this study for the current scenario. The Unsteady Reynolds Averaged Navier-Stokes equations (URANS) together with the realizable k-ϵ turbulence model have been used in this investigation to study the turbulent wake flow following a ground-surface-attached square shape building. A moderately big obstacle aspect ratio of 4, a Reynolds number of 12,000, and a thin evolving boundary layer thickness have been used in the flow modeling. The designed flow addresses the reversed-flows at the outlet during computation to improve the accuracy of the realizable k-ϵ model. The Reynolds stress components are retrieved using the Boussinesq approach. The wake’s principal compositions, including span-wise-side eddies and area of high stream-wise vorticity in the uppermost portion of the wake, are illustrated by both three-dimensional (3D) representations and planner projections of the mean flow distributions. A braided vortex formation, composed of asymmetric hairpin vortexes, is witnessed in the far-wake area. The association of the near-wake vortex structures with the far-wake and near-wall flow, which is associated with the flow strengths, is also discussed. In this investigation, few areas of large stream-wise vorticity magnitude, like tip vortexes, are correlated to the 3D curving of the fluid motion, and tip vortices did not continuously reach to the free end part of the building. The 3D fluid motion interpretation, which combined several measurements of the flow distribution encompassing the cylinder, shows that the time-averaged near-wake structures are formed of two segments of distinct source and section of dominance. Furthermore, addressing reversed-flow during computation shows notable improvement in the results.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. This is an author produced version of an article published in Building Simulation. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | turbulent wake; vortex shedding; flow structures; tip vortexes; model building; URANS; turbulent boundary layer |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Civil Engineering (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 11 Feb 2022 13:35 |
Last Modified: | 15 Jul 2022 16:06 |
Status: | Published |
Publisher: | Springer |
Identification Number: | 10.1007/s12273-021-0785-8 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:182144 |