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A rational method for determining intermittency in the transitional boundary layer

Veerasamy, D. and Atkin, C.J. ORCID: 0000-0003-2529-1978 (2020). A rational method for determining intermittency in the transitional boundary layer. Experiments in Fluids, 61(1), 11.. doi: 10.1007/s00348-019-2856-5

Abstract

A new rational procedure is proposed for determining the intermittency in the streamwise direction. One of the key parameters for the intermittency determination is the selection of a threshold value, which often involves a certain level of subjectivity. Here, a reliable way of choosing the threshold value in a more objective manner is proposed. The proposed approach involves a single threshold value, equal to the magnitude of the maximum laminar perturbation in the transitional flow. The results obtained are validated with the widely used dual-slope method. In this paper, the measurements are carried out on an experimental arrangement, involving the interaction of an upstream aerofoil wake with a downstream flat plate boundary layer. As a by-product of the study, a scaling parameter has been identified which captures the length of the transition zone as the proximity of the aerofoil in the wall-normal direction is varied.

Publication Type: Article
Subjects: T Technology > TL Motor vehicles. Aeronautics. Astronautics
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
Date Deposited: 06 Dec 2019 09:22
URI: https://openaccess.city.ac.uk/id/eprint/23317
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