James Venning

James Venning
Australian Maritime College | AMC · National Centre for Maritime Engineering and Hydrodynamics (NCMEH)

Bachelor of Aerospace Engineering (Hons), PhD

About

34
Publications
7,233
Reads
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270
Citations
Introduction
I am a post-doctoral fellow at the Cavitation Research Laboratory at the University of Tasmania in Australia, currently researching nucleation effects in cavitating flows. I completed my post-graduate research in bluff body aerodynamics with FLAIR (Fluids Laboratory for Aeronautical and Industrial Research) at Monash University, Australia.
Additional affiliations
May 2016 - present
University of Tasmania
Position
  • PostDoc Position
January 2013 - December 2014
Monash University (Australia)
Position
  • Lecturer
Description
  • Teaching and unit coordination in Industrial Design
March 2011 - April 2016
Monash University (Australia)
Position
  • PhD Student
Education
March 2011 - November 2015
Monash University (Australia)
Field of study
  • Engineering
March 2007 - November 2010
Monash University (Australia)
Field of study
  • Engineering

Publications

Publications (34)
Article
Full-text available
Full three-dimensional numerical simulations are employed to investigate the flows over inclined trapezoidal low-aspect-ratio plates at low Reynolds numbers, aiming to understand the unsteadiness induced by the interaction between the trailing vortical wake structures originating from the swept edges, and those from the leading and trailing edges....
Article
Full-text available
This paper seeks to further elucidate the wake of the Ahmed body by investigating how the time-averaged flow structures vary with frontal aspect ratio. High-resolution particle image velocimetry results are provided for eight different width Ahmed geometries at \(\text {Re}_{\sqrt{FA}}=3\times 10^4\). It is shown that the narrower the body, the g...
Article
Full-text available
Water susceptibility and background nuclei content in a water tunnel are investigated using a cavitation susceptibility meter. The measured cumulative histogram of nuclei concentration against critical pressure shows a power law dependence over a large range of concentrations and pressures. These results show that the water strength is not characte...
Article
Cavitating and bubbly flows involve a host of physical phenomena and processes ranging from nucleation, surface and interfacial effects, mass transfer via diffusion and phase change to macroscopic flow physics involving bubble dynamics, turbulent flow interactions and two-phase compressible effects. The complex physics that result from these phenom...
Article
Full-text available
Microbubble populations within the test section of a variable-pressure water tunnel have been characterised for various operating conditions. The tunnel was operated with demineralised water and artificially seeded with microbubbles from an array of generators located in a plenum upstream of the tunnel contraction. The generators produce a polydisp...
Article
Full-text available
Experimental studies of the influence of fluid–structure interaction on cloud cavitation about a stiff stainless steel (SS) and a flexible composite (CF) hydrofoil have been presented in Parts I (Smith et al. , J. Fluid Mech. , vol. 896, 2020 a , p. A1) and II (Smith et al. , J. Fluid Mech. , vol. 897, 2020 b , p. A28). This work further analyses t...
Article
Full-text available
The spatial and acoustic characteristics of tip vortex cavitation (TVC) inception were measured in a cavitation tunnel. Numerous cavitation events were recorded to reveal the influence of different nuclei populations and cavitation numbers on nuclei capture and activation physics, and the role of the streamwise pressure distribution in a vortex. Sy...
Article
The dynamic structures in the wake of the Ahmed body with a 25° slant angle were investigated. It is well established that the wake is dominated by two, counter rotating, streamwise vortex structures (C-pillar vortices). The influence these vortices have on the flow over the slant back was altered by modifying the width of the body between 60% to 1...
Chapter
A numerical and experimental investigation into the flow and noise produced by a blunt-edged flat plate with a Reynolds number based on chord of 6.8 million and a Mach number of 0.0053 is presented. The flat plate had a 4:1 aspect ratio elliptic leading edge and a square trailing edge with a thickness-to-chord ratio of 0.0054. Experimental measurem...
Article
The steady and unsteady loads acting on a hydrofoil immersed in a turbulent boundary layer have been investigated. Measurements were performed in a cavitation tunnel in which the hydrofoil was mounted from the test section ceiling, via a 6-component force balance. Two NACA0012 hydrofoil models with trapezoidal planforms and aspect ratios of 2.4 and...
Article
The Ahmed body is one of the most well-investigated vehicle bodies for aerodynamic purposes. Despite its simple geometry, the flow around the body, especially at the rear, is very complex as it is dominated by a large wake with strong interaction between vortical structures. In the present study, the flow around the 25° Ahmed body has been investig...
Article
The influence of fluid–structure interaction on cloud cavitation about a flexible hydrofoil. Part 2. - Volume 897 - Samuel M. Smith, James A. Venning, Bryce W. Pearce, Yin Lu Young, Paul A. Brandner
Article
The influence of fluid–structure interaction on cloud cavitation about a stiff hydrofoil. Part 1. - Volume 896 - Samuel M. Smith, James A. Venning, Bryce W. Pearce, Yin Lu Young, Paul A. Brandner
Conference Paper
Full-text available
Cavitation inception in high Reynolds number shear flow is an inherently complex phenomenon due to the stochastic character of both the underlying flow and the nuclei population naturally occurring in the water. Within the present study, the dynamic behaviour of cavitation inception in the shear layer formed in the wake of a nominally two-dimension...
Article
Full-text available
Tip vortex cavitation (TVC) inception and desinence behaviour of a NACA 0012 cross section, elliptical hydrofoil is investigated from a statistical perspective in a cavitation tunnel. Measurements were made for incidences from 4∘\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepa...
Article
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Calibration of the Mie Scattering Imaging (MSI) technique for microbubble size and concentration measurement in hydrodynamic test facilities is investigated. Monodisperse bubbles are generated by a microfluidic ‘T’ junction, and individual bubbles simultaneously imaged with shadowgraphy and MSI. Nominal bubble diameters between 30 and 150μm\documen...
Article
Full-text available
Nuclei, or microbubble, populations control the inception and dynamics of cavitation. It is, therefore, important to quantify distributions in cavitation test facilities to rigorously model nucleation dynamics. Measurements of natural nuclei population dynamics were made in two test facilities in Australia and Japan via mechanical activation using...
Article
Full-text available
Despite recent extensive research into fluid-structure interaction (FSI) of cavitating hydrofoils, there remain insufficient experimental data to explain many of the observed phenomena. The cloud cavitation behavior around a hydrofoil due to the effect of FSI is investigated, utilizing rigid and compliant three-dimensional (3D) hydrofoils held in a...
Conference Paper
Full-text available
International defence research collaboration between regional allies fosters the symbiotic development of scientific expertise and enables benchmarking of techniques and results. On
Article
This study presents the results from high-spatial-resolution water-channel velocity-field measurements behind an Ahmed body with 25° rear slant angle. The Ahmed body represents a simplified generic model of a hatchback automobile that has been widely used to study near-wake flow dynamics. The results help clarify the unresolved question of whether...
Article
Full-text available
This paper presents a novel approach to better understand the unsteady aerodynamics associated with a dynamically pedalling cyclist. Using high resolution Particle Image Velocimetry (PIV) in a water channel, the large-scale wake structure is analysed for various phases of the crank cycle of a 1:4.5 scale-model cyclist/bicycle under both static and...
Conference Paper
Full-text available
Cavitation inception in practical flows is invariably heterogeneous as nucleation sites are provided by microbubble populations. Microbubbles grow explosively, filling with vapour, when exposed to a critical pressure which is size dependent. The detection of physical bubble activations in a known pressure field can therefore be used to measure bubb...
Conference Paper
Full-text available
A new device for microbubble generation using small-scale unsteady cavitation of supersaturated water is presented. Cavi-tation is created in a radial diffuser with a directed outlet for inlet/saturation pressures ranging from 300 to 1000 kPa. The diffuser is formed using an acrylic plate spaced 100 µm above a 0.5 mm diameter outlet. Optical access...
Conference Paper
Full-text available
The formation, size and concentration of microbub-bles generated in the wake of a cavitating hy-drofoil are investigated experimentally for several Reynolds and cavitation numbers. The present work is restricted to bubble generation from stable sheet cavitation. Interactions between the cavity, the overlying boundary layer and associated interfacia...
Conference Paper
Full-text available
Time-Resolved Particle Image Velocimetry (TR-PIV) data was acquired in the wake of Ahmed bodies allowing the effects of varying the aspect ratio on the wake dynamics to be revealed. The spatial structures and energy contained in the dominant wake modes within the frequency spectra were investigated. It was found that a dominant frequency existed in...

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Projects

Projects (2)
Project
Tip vortices and sheet cavitation will be studied for flows around hydrofoils and propellers.