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

Citation

Ashworth Briggs, A and Fleming, A and Duffy, J and Binns, JR, 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. ISSN 1475-0902 (2018) [Refereed Article]

Copyright Statement

Copyright IMechE 2018

DOI: doi:10.1177/1475090218776202

Abstract

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

Item Details

Item Type:Refereed Article
Keywords:particle image velocimetry, fluorescing particles, hydrofoil, free surface, tip vortex, vortex meander, vortex wander, vortex aperiodicity, towing tank, flat plate
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Naval Architecture
Objective Division:Transport
Objective Group:Water Transport
Objective Field:Passenger Water Transport
UTAS Author:Ashworth Briggs, A (Dr Alex Ashworth Briggs)
UTAS Author:Fleming, A (Dr Alan Fleming)
UTAS Author:Duffy, J (Dr Jonathan Duffy)
UTAS Author:Binns, JR (Professor Jonathan Binns)
ID Code:127399
Year Published:2018
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2018-07-26
Last Modified:2019-02-15
Downloads:0

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