Professor Julio Soria

Professor Julio Soria

Deputy Head, Mechanical and Aerospace Engineering
Professor, Personal Chair in Mechanical Engineering (Aerodynamics and Fluid Mechanics)
Department of Mechanical and Aerospace Engineering
Room 103, 19 College Walk (Building 33), Clayton Campus

Julio Soria holds a Personal Chair in Mechanical Engineering (Aerodynamics and Fluid Mechanics) within the Department of Mechanical and Aerospace Engineering in the Faculty of Engineering at Monash University. He is interested in the physics and control of turbulent flows. He uses both physical experiments and direct numerical simulation to investigate fluid physics. His current research interests include: attached and separated turbulent boundary layer flow, subsonic and supersonic jet flow, swirling flow, physics and the development of non-intrusive optical experimental measurement methods.

Professional Association:

Fellow of the Australasian Fluid Mechanics Society

Associate Fellow of American Institute of Aeronautics and Astronautics

Member of European Mechanics Society

Member of American Physical Society



  • B.E., University of Western Australia
  • Ph.D., University of Western Australia


Turbulent Shear Flows
Flow Instability and Control
Image-based Laser Diagnostics, PIV, LDA, PLIF, etc
Direct Numerical Simulation of Turbulence

Research Projects

Not started projects

Maintaining and enhancing merit-based access to the NCI National Facility

Australia’s National Computational Infrastructure (NCI) is the national, high-end research computing facility, providing researchers in universities, government science agencies and industry with world-class, integrated, high-performance services. These services enable high-impact, computational and data-intensive research in all fields of science and technology, and support the work of 190 ARC centres of excellence, research projects and fellowships that generate more than 700 publications p.a., and which are in receipt of $43M p.a. from the ARC. This grant will continue merit-based access to NCI at the current level (i.e., a 30% facility share), ensuring ongoing international competitiveness of research and securing the ARC’s investments.

Current projects

Novel Sample introduction techniques for Plasma based Atomic Spectroscopy

The Defence Science and Technology Group (DST Group) Fluid Mechanics (Surface Roughness) Scholarship

An unnamed scholarship (project-based) and associated project funding agreement under the Defence Science Partnering Deed between the Defence Science and Technology Group of the Department of Defence Maritime Division and Monash University for the study of the influence of surface roughness on boundary layer and wake structure.

Modeling coherent structures in free and wall-bounded shear flows

Universities Australia – DAAD 2016 Australia – Germany Joint Research Co-operation Scheme

Turbulent Wall-bounded Flow in Adverse Pressure Gradient Environments

Energy generation and usage and their relationship to energy security and greenhouse gas emissions are fundamental to our society, the way we function and live. There is increasing demand to generate and use energy in transport and industry more efficiently. However, the main hurdle is our inability to predict and control wall turbulence and particularly in adverse pressure gradient environments. Via new experimental investigations using advanced 3C-3D image-based laser diagnostics with complementary numerical studies, this research will develop new fundamental understanding that will lead to improved designs and adaptive fluidic control systems that will increasing operational envelopes and efficiencies in power generation and transport.

Impinging Supersonic Jets: Stability and Control - With Application to Cold Spray

Impinging supersonic jet flow is a critical component of the cold gas spray process which is a new rapid manufacturing process capable of coating surfaces virtually free of oxides. Aero-acoustics and transient flow instabilities in this high-speed impinging flow have profound effects on the structure and dynamics of this flow and are not well understood. This causes non-uniformity or failure of the coating and diminishes the efficiency of the cold gas-dynamic spray process. Laser-based imaging diagnostics complemented with numerical simulations is used to investigate the fluid physics to gain the essential understanding necessary to use this flow in an energy efficient and optimal manner and to extend its potential to range of application.

The underexpanded impinging jet: a self-forcing flow of critical importance

The focus of this research is to develop an in-depth understanding of receptivity mechanisms in the
underexpanded impinging jet flow. By elucidating the underlying physics of this highly complex flow field, the
project will facilitate active control methodologies in a range of key industrial flows. Underexpanded impinging jets
have broad applications ranging from aerospace propulsion to additive manufacturing to pharmaceutical drug
delivery. The expected outcomes of the research include improving the efficiency and efficacy of a number of
cutting edge industrial processes, as well as increased knowledge about the fundamental science.

An Investigation of the Relationship Between the Flow Topology of Turbulent Free Shear Flows and Mixing of Dynamically Passive Scalars

Past projects

Strengthening merit-based access and support at the new NCI petascale supercomputing facility

Access to world-class high-performance computing resources is a necessity for many areas of nationally significant research. It enables researchers to establish and maintain international competitiveness by establishing capacity, driving innovation and underpinning fundamental knowledge discovery. This application, from six research-intensive universities, will establish dedicated resources for 2012 to 2015 on Australia’s leading high-end research computing services based at the National Computational Infrastructure national Facility. It will also leverage $50M in infrastructure support from the Commonwealtha and $32M in co-investment from CSIRO, the Bureau of meterology and ANU.

An Experimental Investigation of Submarine Flows

High-resolution molecular tagging velocimetry and thermometry facility

Turbulent flows are of pervasive scientific and engineering importance. Most often, they also involve temperature variations. The proposed Molecular Tagging Velocimetry and Thermometry (MTV&T) facility will provide simultaneous measurements of instantaneous temperature and velocity at high resolution over a planar domain. MTV&T is nonintrusive, as it relies on the emission of long-lifetime phosphors that have been mixed into the working fluid. For this reason, MTV&T is especially well-suited for microscale, non-Newtonian, particle laden flows, and liquid/gas interface flows. The proposed infrastructure will be the first of its kind in
Australia, and will produce data that uniquely advance the engineering and science of complex flows.

A Study of Particle-Laden Swirling Flow with Vortex Breakdown

A study of the spanwise vorticity structure and flow topology in separation-reattachment wall bounded flow

Experimental investigation of noise generated by a bubbly plume

PIV measurements of Joubert Geometry in the LTRAC Water Tunnel and the AMC Cavitation Tunnel

Development of subgrid scale laws for geophysical flow simulations

The evolution of intense focal structures in spatially developing three-dimensional time-dependent plane wakes

The structure of the invariants of the pressure Hessian and velocity gradient diffusion in homogeneous isotropic turbulence.

Experimental Facility for Extreme Air/Sea Interaction studies

This project will realize a world leading scientific facility for studies of the air/sea interface. The processes that occur at the air/sea interface, such as surface wave formation, mixing and the exchange of energy and gases, have put half of the Earth’s Carbon Dioxide in the ocean and have a major influence on climate and climate change. But unknown are the critical parameters and dynamics that control these processes and to understand them, and in turn the global carbon cycle, requires an in depth study of the physics at the air/sea interface. Major outcomes include a thorough understanding of the critical physical air/sea interface processes which affect climate change and global warming, and more credible predictive models of both.

An Experimental Study of the Three-dimensional Structure of Unsteady Separation-reattachment Flow Over a Blunt Leading Edge Flat Plate

A Study of the Relationship Between the Topology of the Flow Field and Scalar Fields in Forced Isotopic Homogeneous Turbulence

The effect of turbulence scale and intensity on water flow measurement using ultrasonic techniques

The effect of turbulence on innovative high precision ultrasonic flow-velocity (USV) measurement techniques will be investigated to provide better understanding of USV approaches that should be used to accurately measure turbulent small flows. This knowledge will be used to develop low-cost, robust, high precision USV technology to measure and monitor water flow in urban and non-urban distribution networks. The deployment of this technology has the potential to prevent the loss each year of more than 155GL of water through leaks and burst pipes from the urban water distribution networks of Australia s capital cities alone.

Direct Numerical Simulation Studies of Stability and Transition to Turbulence of Vortex Rings and Round Jets

Present Papers, 8th International Conference on Laser Anemometrh Advances and Application, Rome, Italy and the 3rd International Workshop on Particle Image Velocimetry, University of California, Santa

Present Papers, 8th International Conference on Laser Anemometrh Advances and Application, Rome, Italy and the 3rd International Workshop on Particle Image Velocimetry, University of California, Santa Barbara

Quantitative measurements of bio-oil sprays using the time resolved x-radiography

Structure, Dynamics and Control of Wall-Bounded Turbulence

Wall-bounded turbulence is responsible for skin friction drag on aircraft, trains, cars and ships and dispersion of contaminants. This project will incorporate theory within the Fluids Information Triad concept and provide unprecedented insight into the physics of wall turbulence. Direct numerical simulation of wall turbulence with development and application of complementary innovative laser-based experimental techniques and technology will be employed to investigate the structure and dynamics of wall turbulence. The new knowledge from this research will lead to novel technologies that reduce and control drag and lift in transport and pollution dispersion and therefore, reduce fuel usage and CO2 emissions.

Dynamic-Active Flow Control - Phase 1 (Jul-Nov 2005)

Characterising particulate laden flow in the lung airways: from drug delivery to primary anthropogenic sources

The objective is to establish a joint facility between Monash University and the University of Sydney to determine flow and particle size characteristics of micronised and nano-sized particles in simulated lung airways. The proposed facilities consists of a 3D Tomographic Imaging System, with its unprecedented resolution and dynamic measurement capabilities, and state of the art particle sizing and will provide advanced research capabilities including three dimensional imaging, measurement of flow, and sizing of particles under different breathing patterns in an in-vitro respiratory tract airway environment for drug delivery, clinical and anthropogenic particle transport applications.

Quantification of the Characteristics of Taylor-couette Flow Using Optical Velocimetry Techniques

Rubicon FlumeGate Flow Model Development

A Research Facility for Quantitative Digital Visualisation and Laser Diagnostics

This proposal is a response to the identification of an urgent need for a research facility dedicated to quantitative digital visualisation and laser diagnostics in fluid mechanics, combustion and structural dynamics.


Cold gas-dynamic spray process is a new flexible free forming manufacturing process with applications in rapid manufacturing from the nano-scale to the macro-scale in the form of spray coatings virtually free of oxides. The dominant control mechanism of this process is supersonic particle-laden impinging jet flow, which is not well understood. Laser-based ultra-high-speed imaging will be used to investigate the fluid physics and spray particle physics to gain the essential understanding necessary to use this new manufacturing process in an energy efficient and optimal manner and extending its potential range of application.

Micro/nano optomechatronics sensing, measurement, and control research facility

The project aims to establish a unique joint facility between Monash and Deakin for micro/nano optomechatronics sensing, measurement, and control. It consists of a laser-based confocal microscope, laser interferometers, force/torque and capacitive sensors, and vibration isolated platforms. The facility will enhance current research facilities and programs enabling precision motion measurement of micro/nano manipulation systems and acquiring profile/characteristics of micro/nano objects as a unique means of modelling, analysis, and experimentation. This is the only facility of its kind in Australia and will provide for establishment of enabling technologies in many high quality research projects with recognised potential in frontier areas.

Advanced Facility for Ultra High-speed Visualisation and real-time Diagnostics of Particles and Droplets

The charecteristics and dynamics of particles, droplets and bubbles are critical elements for a large range of engineering applications. This facility will provide ultra-high speed and real-time testing of these entities to provide a deeper insight into processes and phenomena that previously only remained as a topic of discussion. Now, a unique 3-D ultra high-speed visualisation of the dynamic interaction of droplets, particles and bubbles, real-time particle charecterization in air and solution and a real-time particle testing by indentation will provide important and unknown insights into combustion, fluid mechanics, material processing and material structure.

Experimental investigation of turbulent trailing flows

Interaction between bluff-body wake flow and free surface

To Present Papers At Conferences in the UK, USA, France and Associated Research Visits

Investigation of the Structure of a Separating Turbulent Boundary Layer

ICOMASEF - Instability and Control of Massively Separated Flows

Investigation of the Application of Smart Materials to Dynamic Flow Control on Flight Vehicles

The structure of turbulent boundary layers

Turbulence, especially turbulence in a thin layer of fluid next to a wall or surface known as the turbulent boundary layer, has a large influence on the lift, drag and separation of the flow over all bodies, for example, over missiles, aircrafts, ships submarines. Turbulence also affects the performance of fluid devices such as turbines, fans and pumps, and influences mixing and combustion and the dispersion of pollutants. An understanding of the mechanism of turbulence will enable us to develop better mathematical models which can be sued in computer programs to accurately predict control turbulence, resulting in energy and economic savings.

Time-resolved Tomographic Particle Image Velocimetry Facility

Turbulent flows and dynamics of solids in engineering and geophysics have time-dependent and highly three dimensional complex features. Understanding them requires time-resolved quantitative information of the 3-components of velocity in a fluid and surface strain in solids over significant 3-dimensional domains. The proposed time-resolved tomographic particle image velocimetry facility will provide this capability, integrated into
existing world-leading test facilities. The infrastructure will lead to experimental data that will give unique insights
into the yet-to-be understood physical mechanisms responsible for skin-friction drag on aircraft, ships and any
vehicle and the complex strain dynamics and stress fields of solids.

ARC Large 1996 - Dr J Soria

Modern PIV Applied to Canonical Pitch-Ramp Problem in Low Reynolds Number Aerodynamics

Integrated Combustion Research Facility for Biomass Derived Fuels

Bio-mass derived fuels are gaining in importance because they can contribute to solving the problems arising from the world wide decline in the reserve to production ratio of crude oil, the emission of greenhouse gases and energy security. In Australia they can also assist in mitigating dry-land salinity by increasing the viability of large-scale plantation of locally indigenous trees. However significant technical and political issues remain to be addressed before this potential can be realised. The Integrated Combustion Research Facility for Biomass Derived Fuels to be established by this grant will provide the necessary infrastructure to address these issues.

Bio-oil from woody biomass - a sustainable fuel for Australia

The focus of this research program is to demonstrate the viability of bio-oil derived from woody biomass as a future energy source for Australia. In this program, we optimise the pyrolysis process used for production of bio-oil and develop a fundamental understanding of bio-oil combustion characteristics through use of an array of state-of-the-art conventional and X-ray based experimental and numerical methods. We will also evaluate the performance of the bio-oil in research engines. Linking bio-oil production, combustion fundamentals and application in a single comprehensive project is entirely novel and will enable us to optimise fuel quality and engine specification.

Tomographic PIV Study of the Low Re Number Flow Around a Pitching Plate with a Ramp Time History

Three-dimensional Optical Laser Velocimetry for the HRNBLWT (High Reynolds Number Boundary Layer Wind Tunnel)

Most unsteady and turbulent flows of engineering and geophysical interest have a highly three-dimensional complex features, and understanding them ideally requires quantitative information on the three components of velocity over a significant three-dimensional domain. The proposed infrastructure will provide such a capability and will be integrated into a world-leading wind-tunnel facility designed for the study of wall-bounded turbulent flows. The infrastructure will lead to experimental data that will give unique insights into the yet-tobe understood physical mechanisms responsible for skin-friction drag on aircraft, shops and any vehicle and in understanding particle dispersion in turbulent flows.

The Structure of Axisymmetric Zero-net-mass Flux Jets

The structure of turbulence at high Reynolds numbers

The aim of this projct is to gain a physial understanding of the process of turbulence in fluid motion, in particular inboundary layers adjacent to the surface of bodies. This is basic to the engineering task of predicting the drag on vehicles, ships and aircrafts and the performance of fans, pumps and tubines. the wind tunnel used in this project is the largest of its type in the world and can attain flows of the same order of magnitude as in practical application. this will enable us to extend our understanding of the physics of turbulence for flows much higher than has been previously possible.

Sprayed coatings of light metals

Atomisation and combustion physics of Australian bio-oils.

Australia is highly dependent on fossil fuels for energy production and transport, and this dependence is growing. Wide spread substitution of liquid hydrocarbon fuels by indigenous renewable bio-oil has the potential to improve Australian’s energy outlook and assist in reaching greenhouse gas targets. Understanding the interrelationships between the physical and chemical properties of bio-oil, its atomisation, droplet formation and combusion physics is fundamental to the delivery of an efficient and reliable combustion process using this fuel. Measurements using laser based diagnostics of the atomisation flow, droplet formation and combusion process will provide the experiemental data to understand this complex interrelationship.

Teaching Commitments

  • MAE4965
  • MAE3401
Last modified: 24/06/2021