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Low-drag events in transitional wall-bounded turbulence

Lookup NU author(s): Dr Richard Whalley

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Abstract

Intermittency of low-drag pointwise wall shear stress measurements within Newtonian turbulentchannel ow at transitional Reynolds numbers (friction Reynolds numbers 70  130) is characterizedusing experiments and simulations. Conditional mean velocity proles during low-dragevents closely approach that of a recently-discovered nonlinear traveling wave solution; both pro-les are near the so-called maximum drag reduction prole, a general feature of turbulent ow ofliquids containing polymer additives (despite the fact that all results presented are for Newtonianuids only). Similarities between temporal intermittency in small domains and spatiotemporalintermittency in large domains is thereby found.

Publication metadata

Author(s): Whalley RD, Park JS, Kushwaha A, Dennis D, Graham MD, Poole R

Publication type: Article

Publication status: Published

Journal: Physical Review Fluids

Year: 2017

Volume: 2

Online publication date: 06/03/2017

Acceptance date: 26/01/2017

Date deposited: 27/01/2017

ISSN (electronic): 2469-990X

Publisher: American Physical Society

URL: https://doi.org/10.1103/PhysRevFluids.2.034602

DOI: 10.1103/PhysRevFluids.2.034602

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