The temporal coherence of prograde and retrograde spanwise vortices in zero-pressure gradient turbulent boundary layers

Callum Atkinson, Vassili Kitsios, Soria

Research output: Chapter in Book/Report/Conference proceedingChapter (Book)Researchpeer-review

Abstract

Spatial and temporal statistics associated with spanwise aligned vortical structures are extracted from high repetition rate particle image velocimetry (HR- PIV) experimental measurements of a zero-pressure gradient turbulent boundary layer. Measurements were performed in the LTRAC water tunnel with a momentum thickness-based Reynolds number of Reθ = 2,250. Streamwise wall-normal planes of the field were recorded at rate of Δt = 0.008δ/U, spanning a streamwise domain of 3.2δ. This enables a single structure to be sampled approximately 400 times for a duration of 3.2δ/U as it convects downstream. A model Oseen vortex is fit to each local peak in swirling strength, in order to detect and classify the radius, centroid velocity, circulation, and centroid location of each spanwise vortex. Attempts to track the evolution of these vortices show that on average these Oseen vortices only appear to remain temporally coherent for a time of 0.02δ/U.

Original languageEnglish
Title of host publicationProgress in Wall Turbulence 2
Subtitle of host publicationUnderstanding and Modelling
EditorsMichel Stanislas, Ivan Marusic, Javier Jimenez
Place of PublicationCham Switzerland
PublisherSpringer
Pages147-157
Number of pages11
ISBN (Electronic)9783319203881
ISBN (Print)9783319203874
DOIs
Publication statusPublished - 2016
Event2nd WALLTURB Workshop on Understanding and modelling of wall turbulence, 2014 - Lille, France
Duration: 18 Jun 201420 Jun 2014

Publication series

NameERCOFTAC Series
PublisherSpringer Netherlands
Volume23
ISSN (Print)1382-4309
ISSN (Electronic)2215-1826

Conference

Conference2nd WALLTURB Workshop on Understanding and modelling of wall turbulence, 2014
CountryFrance
CityLille
Period18/06/1420/06/14

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