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Tracking the vortex core from a surface-piercing flat plate by particle image velocimetry and numerical simulation

Ashworth Briggs, AJE ORCID: 0000-0001-7225-6513, Fleming, A ORCID: 0000-0002-2738-4521, Duffy, J ORCID: 0000-0003-3484-1345 and Binns, JR ORCID: 0000-0001-6892-0063 2018 , 'Tracking the vortex core from a surface-piercing flat plate by particle image velocimetry and numerical simulation' , Institution of Mechanical Engineers. Proceedings. Part M: Journal of Engineering for the Maritime Environment , pp. 1-16 , doi: 10.1177/1475090218776202.

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Abstract

The wake flow around the tip of a surface piercing flat plate at an angle of incidence was studied using two-dimensionalparticle image velocimetry as part of benchmarking the particle image velocimetry technique on the moving carriage inthe Australian Maritime College towing tank. Particle image velocimetry results were found to be in close agreement withthose of the benchmarking work presented by the Hydro Testing Alliance, and a method of tracking the tip-vortex corenear a free surface throughout numerical simulation has been demonstrated. Issues affecting signal to noise ratio, such asspecula reflections from the free surface and model geometry were overcome through the use of fluorescing particlesand a high-pass optical filter. Numerical simulations using the ANSYS CFX Solver with the volume of fluid method werevalidated against the experimental results, and a methodology was developed for tracking the location of the wanderingvortex core experimentally and through simulation. The ability of the scale-adaptive simulation shear stress transport turbulencemodel and the shear stress transport model to simulate three-dimensional flow with high streamline curvaturewas compared. The scale-adaptive simulation shear stress transport turbulence model was found to provide a computationallyless resource-intensive method of simulating a complex flow topology with large eddies, providing an insight intoa possible cause of tip-vortex aperiodic wandering motion. At high angles of attack, vortex shedding from the leading edgeseparation of the test geometry is identified as a possible cause of the wandering phenomena. In this study, the vortexcentre and point of extreme core velocity were found not to be co-located. The point of extreme stream wise velocitywithin the vortex core was found to be located within half the vortex radius of the vortex centre.

Item Type: Article
Authors/Creators:Ashworth Briggs, AJE and Fleming, A and Duffy, J and Binns, JR
Keywords: particle image velocimetry, fluorescing particles, hydrofoil, free surface, tip vortex, vortex meander, vortex wander, vortex aperiodicity, towing tank, flat plate
Journal or Publication Title: Institution of Mechanical Engineers. Proceedings. Part M: Journal of Engineering for the Maritime Environment
Publisher: Sage Publications Ltd
ISSN: 1475-0902
DOI / ID Number: 10.1177/1475090218776202
Copyright Information:

Copyright IMechE 2018

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