Effects of Frontal and Plan Solidity on Rough-Wall Turbulent Channel Flow Over Pyramid Roughness

Zhdanov, O. and Busse, A. (2022) Effects of Frontal and Plan Solidity on Rough-Wall Turbulent Channel Flow Over Pyramid Roughness. In: 12th International Symposium on Turbulence and Shear Flow Phenomena (TSFP12), Osaka, Japan, 19-22 July 2022,

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Abstract

Direct numerical simulations of turbulent flow over rough surfaces comprised of pyramids are conducted in a closed channel configuration at Reτ = 395. The effects of frontal and plan solidity on the fluid dynamic roughness effect in the ‘waviness’ regime are investigated. The frontal and plan solidity are systematically varied from 0.05 to 0.1 and from 0.25 to 1, respectively. The results show that both parameters have significant effect on the roughness function and mean flow and turbulence statistics. Frontal solidity influences the roughness function at any value of plan solidity, while plan solidity has a strong impact only at low frontal solidity. In addition, surfaces with peak-to-peak spanwise spacing comparable to the outer scale of the flow are found to generate secondary currents.

Item Type:Conference Proceedings
Additional Information:We gratefully acknowledge support by the United Kingdom’s Engineering and Physical Sciences Research Council under grant number EP/V002066/1.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Busse, Dr Angela and Zhdanov, Dr Oleksandr
Authors: Zhdanov, O., and Busse, A.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
Copyright Holders:Copyright © 2022 The Authors
Publisher Policy:Reproduced with the permission of the publisher
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
309558Secondary currents in turbulent flows over rough wallsAngela BusseEngineering and Physical Sciences Research Council (EPSRC)EP/V002066/1ENG - Autonomous Systems & Connectivity