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Dr Konstantina Vogiatzaki

Dr Konstantina Vogiatzaki is a Senior Lecturer at the University of Brighton and member of the Advanced Engineering Centre – a centre dedicated to high-efficiency internal combustion engine (ICE) research. Her research within the Centre lies in the field of Computational Fluid Dynamics (CFD). She develops high fidelity numerical algorithms that can be used as part of virtual manufacturing tools of future energy systems. She has expertise both in RANS and LES simulations of multiphase flows and turbulent combustion. Her aspiration is that her research can contribute towards the solution of the grand challenges of today in relation to climate change and sustainability of our planet using state of the art algorithms that help us analyse, understand, and eventually predict phenomena relevant to thermo fluids dynamics. She has published more than 30 high impact journal and conference papers and she has been involved in various projects with industrial support.   

Konstantina-Vogiatzaki

How I like to teach

With a background in both applied mathematics and fluid mechanics, my teaching is characterised by a multidisciplinary approach. I am teaching a range of courses both at postgraduate and undergraduate level, such as thermodynamics, dynamics, advanced fluid mechanics and computational fluid dynamics. It is my priority to present educational material in an engaging and memorable manner that shows the elegance and beauty of the course as well as demonstrating solutions to common problems, which can be often found in engineering practice. Since my teaching directly relates to the areas that my group performs research on, I try to update my lectures with the most recent developments, practices and applications in the relevant fields. This helps the students to familiarise with the state-of-the-art technologies currently used, as well as extending their understanding on how the fundamental knowledge gained during their university studies can find application in their future role as engineers and project managers.   

The voyage of discovery is not in seeking new landscapes but in having new eyes.

Marcel Proust

My research interests

My field of expertise is in problems involving the interaction of turbulence with reactive multiphase flows. More recently I have extended my research to flows through porous media as well as bubble formation in ultra-high pressure injection systems.

Large Eddy Simulations (LES) of in-nozzle flow, spray dynamics and ignition at ultra-high pressure devices
The efficiency of spray systems designed for various applications is determined by the size/shape distribution and velocity of the droplets formed. For example, in combustion process, smaller droplets imply higher vaporisation rates and subsequently more efficient combustion with fewer emissions. Despite the importance of droplet size and velocity distributions in industrial applications, there are fundamental questions which still remain unanswered. Given certain conditions, including fluid properties and geometry, it is unclear what size and shape of the droplets are expected to be generated. What is the effect of ultra-high pressure (up to 3000bars that modern automotive injectors operate) and turbulence on these structures? How do these liquid structures evolve? What is the effect of in-nozzle phenomena on the formation of sprays? What happens when the injected fluid exhibits super critical conditions. 

My current research aims at answering these questions through the development of advanced numerical tools within Large Eddy Simulations context that will be capable of representing in a unified manner in-nozzle and subsequent spray formation mechanisms and will be valid for both sub- and supercritical conditions. With co-workers from Imperial College (Dr S. Navarro Martinez), Stuttgart University (Prof A. Kronenburg) and Melbourne University (Dr R. Gordon) we work on implementing a novel model for spray evolution based on the probabilistic modelling of sub-grid scale liquid surface evolution under sub-critical conditions. Parallel research is performed within our group towards understanding supercritical conditions based on experiments from the ECN network as well as complimentary experiments at ultra-high pressure performed in house (collaboration with Prof Crua). We try to understand the shock wave formation of high pressure jet tips and the effect these waves have to the surrounding turbulence. Moreover, the interaction of these waves with waves travelling from within the nozzle downstream to the nozzle exit because of cavitation collapse is of interest.  

Multiple Mapping Conditioning (MMC)
An important part of my work has focused on a novel approach in turbulent combustion named Multiple Mapping Conditioning (MMC). MMC offers a new predictive framework based on conditional and probabilistic methodologies that can account for detailed chemical kinetics and turbulent mixing and thus offers more accurate prediction of emissions and efficiency of energy conversion systems. In the past seven years, I developed key model closures for MMC – both in a stochastic and deterministic context – and I pioneered the implementation of the model in real flames. MMC is not only a rigorous combustion model but can be used as a generalised mixing model for a variety of flow configuration that accurate prediction of mass and heat transfer is important. Mixing in reality determines the efficiency of the device and the production rate of pollutants and thus its accurate modelling is of interest. In collaboration with colleagues, I have developed a new turbulent mixing algorithm based on the extension of the ideas of MMC methodology to be applicable to any device where different fluids are injected separately and are required to mix. Although this model has mostly been implemented in the RANS context and simple jet flame configurations, part of my current research focuses on extending the model to the Large Eddy Simulations context and to test its applicability to a wider range of problems that combine mixing and chemical processes. More specifically, I am interested in exploring the applicability of the methodology in high pressure chambers that have application to automotive industry.

Enriching the energy mix with alternative fuels (Hydrogen, Syngas, Bio-fuels)
The growth of the energy consumption due to population and economic growth represents a pressing problem for most countries both in financial and environmental terms. Electricity generation as well as transportation currently relies on hydrocarbons which are both running out and contribute tremendously to climate change. The use of alternative fuels mostly coming from renewable sources such as wind or solar energy has started to emerge as a promising solution although there are not yet the technologies available (or even if they are available, their cost is prohibitive) to completely replace the use of fossil fuels for large-scale energy generation. My current research within this field in collaboration with Dr R. Morgan and colleagues from MIT evolves around the idea of how traditional sources of energy can be supplemented by renewable forms of energy in large power plants. Our current focus is on synthetic fuels with various hydrogen context. We explore the effect of the fuel input on the combustion stability mechanisms

Cavitation and flashing
Microscopic bubbles are ubiquitous in nature and could interact significantly with their environment once excited. Extensive studies have elucidated these effects in diverse fields of application, eg. hydrodynamics, sound and erosion structure protection and environmental technologies. However, still many questions remain unanswered and the CFD modelling of their dynamics is a very challenging task mostly because of the lack of rigorous algorithms to track the full process from nucleation to bubble explosion and the release of energy to their surroundings. The problem I am currently interested in is relevant to bubble formation within ultra-high pressure injectors also known as cavitation. In our group (with collaborators from Stuttgart University), we are working on a project entitled: LES modelling of bubble collapse-induced spray atomisation for cryogenic fluids. Flashing is similar in nature to cavitation however it occurs when a liquid’s temperature exceeds a certain degree of superheat. Flashing also can accelerate the primary spray break-up when the bubbles – present in the superheated liquid because of the pressure changes through the process – explode and thus leads to smaller droplets. The resulting very fine droplets promote a quick evaporation of the liquid and lead to a rather homogeneous mixing with the carrier gas. The phenomena can be manifested in the chemical and process plants where liquid superheat is essential. The phenomenon is initially more violent at the surface and causes the liquid to acquire a very heterogeneous temperature composed of superheated, saturated, and sub-cooled liquid. The area of research we are interested in is how these temperature variations are affected by turbulence and how they can affect in turn the chemical processes taking place at the applications that flashing occurs.

Flows through microscale porous materials
This project is relevant to environmental fluid dynamics in the context of oil and gas interaction through tight porous media. We are performing high fidelity numerical simulations to explore the flow patterns of multiple phases (oil, water, gas) present in the primary and secondary extraction phase inside the complicated structures of rocks. We aspire to help designers and operators of large wells to solve flow problems, extend life of flow and, ultimately, assure the efficient and reliable delivery of the product. Our main challenge is to perform the simulations in a manner that accounts for interpenetrating or immiscible fluids that include effects of pressure, temperature and liquid/gas mass transfer in detail. We also target creating generalised algorithms that will allow us, in the future, to tackle a wider range of problems in porous materials such as Porous Media Combustion (PMC), storage of CO2, flow of fluids and solutes in biological tissues.

Research activity

Current research projects

  • Unified modelling framework of sub- and super-critical injection dynamics, EPSRC (EP/P012744/1) (2017–2018) Principal Investigator – Project Partners: Ricardo UK, MIT USA
  • Development of virtual design tools to support manufacturing of reduced greenhouse gas emission systems operating with alternative fuels (2017–2020) DTA Energy network program, Principal Investigator – Project Partners: Ricardo UK, MIT USA
  • A novel approach to zero emission combustion for ultra high efficiency internal combustion engines (2017–2020) EPSRC studentship, Co-Investigator – Project Partners: Ricardo UK
  • Unifying the modelling of in‐nozzle flow and subsequent spray formation at high pressure injection systems based on probabilistic approaches (2017–2020) EPSRC studentship, Principal Investigator – Project Partners: Ricardo UK
  • Ultra Efficient Engines and Fuels EPSRC (EP/M009424/1) (2014–2018) Team Member
  • Holistic Approach of Spray Injection through a generalised multi-phase framework (HAoS) (2015–2019) EU H2020-ITN, Co-Investigator

Previous research projects

  • Multiphase Flow Modelling through Porous media (2014–2017) PhD Studentship Scheme, City University, London, UK, Principal Investigator
  • A generalised approach of modelling spray injection process with Large Eddy Simulations (2014) Pump Priming Research Development Fund, City University, London, UK, Principal Investigator

Research centres and groups

  • Advanced Engineering Centre
  • University Internal Combustion Engine Group (UniCEG)

Social media

Linked In

ResearchGate

Contact me

Computing, Engineering and Mathematics
Cockcroft Building,
Lewes Road
Brighton
BN2 4GJ

Email: K.Vogiatzaki@brighton.ac.uk

Biography

I graduated from the Department of Applied Mathematics at the National Technical University of Athens (NTUA) in 2005 and then I obtained my PhD from Imperial College London (2010) entitled: Stochastic and deterministic multiple mapping conditioning for jet flames. For my PhD work, I was awarded the prestigious Bernard Lewis Fellowship by the Combustion Institute in 2010. Following my PhD, I worked as a postdoctoral researcher at Imperial College for two years, developing LES models for sprays relevant to aero-engine applications, before moving to the Massachusetts Institute of Technology (MIT), USA where I was appointed as research fellow at the Mechanical Engineering Department for two years. I worked in the field of CFD modelling of combustion instabilities. In 2013, I became lecturer at City University of London. I served as member of the International Institute of Cavitation (supported by the Lloyd’s Register Foundation) and I was course leader for Thermodynamics (first and second year) and programme director of the Energy Environmental Technology and Economics MSc. I worked on understanding the interaction of bubbles and droplets with turbulence for high speed injection processes. In 2016, I was promoted to senior lecturer at the University of Brighton and joined the Advanced Engineering Centre (AEC). The Centre develops new knowledge to address long-term energy challenges, in close collaboration with key global industrial partners, such as the 20-year partnership with Ricardo. In 2016, I was awarded the Hinshelwood Prize which recognises meritorious work by a young member of the British Section of the Combustion Institute.

Research output

Number of items: 7.

Aboukhedr, Mahmoud, Georgoulas, Anastasios, Marengo, Marco, Gavaises, Manolis and Vogiatzaki, Konstantina (2018) Simulation of micro-flow dynamics at low capillary numbers using adaptive interface compression Computers & Fluids. ISSN 0045-7930

Tretola, Giovanni, Vogiatzaki, Konstantina and Navarro-Martinez, Salvador (2017) Detailed simulation of air-assisted spray atomization: effect of numerical scheme at intermediate Weber number In: Proceedings 28th European Conference on Liquid Atomization and Spray Systems (ILASS) 2017, Valencia, Spain, 6-8 September 2017.

Pearce, Daniel, Vogiatzaki, Konstantina, Taylor, Alex and Hardaloupas, Yannis (2017) Investigation of the effects of domain representation and boundary condition selection in numerical simulations of micro scale flows with phase change In: Proceedings 28th European Conference on Liquid Atomization and Spray Systems (ILASS) 2017, Valencia, Spain, 6-8 September 2017.

Aboukhedr, Mahmoud, Mitroglou, Nicholas, Georgoulas, Anastasios, Marengo, Marco and Vogiatzaki, Konstantina (2017) Simulation of droplet spreading on micro-CT reconstructed 3D real porous media using the volume-of-fluid method In: Proceedings 28th European Conference on Liquid Atomization and Spray Systems (ILASS) 2017, Valencia, Spain, 6-8 September 2017.

Vogiatzaki, Konstantina, Crua, Cyril, Morgan, Robert and Heikal, Morgan (2017) A study of the controlling parameters of fuel air mixture formation for ECN Spray A In: Proceedings 28th European Conference on Liquid Atomization and Spray Systems (ILASS), Valencia, Spain, 6-8 September 2017.

Zeng, Weilin, Vogiatzaki, Konstantina, Luo, Kai and Navarro-Martinez, Salvador (2017) Assessment of Subgrid-Scale Model Effects on Large Eddy Simulation of a Back-Step Combustor In: Proceedings of the 8th European Combustion Meeting (ECM 2017), Dubrovnik, Croatia, 18-21 April 2017.

Aboukhedr, Mahmoud, Gavaises, Manolis, Georgoulas, Anastasios, Marengo, Marco and Vogiatzaki, Konstantina (2016) Numerical investigation of droplet spreading on porous and non-porous surfaces In: ILASS – Europe 2016, 27th Annual Conference on Liquid Atomization and Spray Systems, Brighton, UK, 4-7 September 2016.

This list was generated on Fri Apr 27 03:14:22 2018 BST.

Download a publications list (PDF)

PhD students

 
NameThesis
Filippo Gerbino (January 2018 – to date) Development of virtual design tools to support manufacturing
of reduced greenhouse gas emission systems operating
with alternative fuels
Dr Cuicui Li - Postdoc (October 2017 – to date)

Unified modelling framework of sub- and super- critical
injection dynamics

Paul McGinn (October 2017 – to date)

Linking  in-nozzle flow with spray dynamics at high pressure
injection based on probabilistic approaches

Simon Harvey (October 2017 – to date)

A novel approach to zero emission combustion for ultra-high
efficiency internal combustion engines

Daniel Nsikane (October 2017 – to date)

Development of practical simulation tools for advanced
combustion system design

Daniel Loureiro  (September 2016 – to date) 

DNS simulation of flash evaporation of cryogenic liquids in
rocket engine injectors. Stuttgart University, Germany

Giovanni Tretola (September 2016 – to date) LES modelling of atomisation from airblast atomisation for
aero-engines. Imperial College London
Weilin Zeng (September 2015 – to date)

Advanced LES Modelling of Turbulent Combustion based on
a Time-Series Approach. University College of London

Mahmoud Aboukhedr (December 2014 – to date)

Simulation of micro-flow dynamics at low capillary numbers.
City University

Roles

Member, UK Turbulent Reacting Flows Consortium (UKCTRF)

Member, Multicore and Manycore Algorithms to Tackle Turbulent flows (MUMATUR), UK Fluid Network, Special Interest Group (EP/N032861/1)

Member, Combustion science, technology and applications, UK Fluid Network, Special Interest Group (EP/N032861/1)

Member, Sprays in engineering applications: modelling and experimental studies UK Fluid Network, Special Interest Group (EP/N032861/1)

Awards

2016: Hinshelwood Prize (Combustion Institute) awarded annually to a young member for outstanding work in any branch of Combustion

2010: Bernard Lewis Fellowship by the Combustion Institute for high-quality research in combustion by young scientists, 33rd International Combustion Symposium

2010: Royal Academy of Engineering travel grant

2007: COCCFEA, Award for the Best Poster and the Best Oral Presentation at COCCFEA Summer School, Cranfield University, 16–18 July

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