Influence of ridge spacing on secondary currents in turbulent channel flow over triangular ridges

Zhdanov, O. and Busse, A. (2023) Influence of ridge spacing on secondary currents in turbulent channel flow over triangular ridges. In: Marchioli, C., Salvetti, M. V., Garcia-Villalba, M. and Schlatter, P. (eds.) Direct and Large Eddy Simulation XIII: Proceedings of DLES13. Series: ERCOFTAC series (31). Springer: Cham, Switzerland, pp. 380-385. ISBN 9783031470271 (doi: 10.1007/978-3-031-47028-8_58)

Abstract

Surfaces with spanwise variation of topology, such as ridge-type roughness, are known to generate secondary currents, which originate from turbulence anisotropy and spatial gradients of Reynolds stresses and represent Prandtl’s secondary flows of the second kind [1]. The presence of secondary currents is reflected in spanwise heterogeneity of the time-averaged streamwise velocity field in the form of alternating high- and low-momentum pathways (HMPs and LMPs), which correspond to downwash and upwash flow regions, respectively. In surfaces with ridge-type roughness, LMPs are typically observed above the ridges and HMPs occur in between them [2, 3]. However, a swap in their locations can be observed when ridge spacing exceeds channel half-height [4].

• Item Type: Book Sections
• Additional Information: We gratefully acknowledge support for this work by the United Kingdom’s Engineering and Physical Sciences Research Council [grant number EP/V002066/1].
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Busse, Professor Angela and Zhdanov, Dr Oleksandr
• Authors: Zhdanov, O., and Busse, A.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Publisher: Springer
• ISBN: 9783031470271
• Published Online: 16 November 2023
• Copyright Holders: Copyright © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024
• First Published: First published in Direct and Large Eddy Simulation XIII: Proceedings of DLES13 2024
• Publisher Policy: Reproduced in accordance with the publisher copyright policy

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Project Code	Award No	Project Name	Principal Investigator	Funder's Name	Funder Ref	Lead Dept
309558		Secondary currents in turbulent flows over rough walls	Angela Busse	Engineering and Physical Sciences Research Council (EPSRC)	EP/V002066/1	ENG - Autonomous Systems & Connectivity