# Dr Foivos Koukouvinis

## Contact

- Dr Foivos Koukouvinis
- +44 (0)20 7040 5060
- foivos.koukouvinis.1@city.ac.uk

## Postal Address

Northampton Square

London

EC1V 0HB

United Kingdom

## About

### Overview

Dr. Foivos (Phoevos) Koukouvinis graduated from the department of mechanical engineering of the National Technical University of Athens (NTUA) in 2008. After that, he attended a post-graduate specialization programme on power production and management in NTUA and started his work as a PhD candidate in the department of fluids, laboratory of hydraulic turbomachines. He successfully finished his post-graduate studies in 2010. In 2012 he completed his PhD research, in the field of hydraulic turbine optimisation, design and experimental testing. In 2013 he was appointed as a post-doctoral researcher (Marie Curie/Research Fellow) in City, University of London, working on the subject of cavitation erosion. Currently he is lecturer in City, University of London, teaching the course of thermodynamics to first year students and participating in research in multiphase, compressible flows.

### Qualifications

- Member, Technical Chamber of Greece, Athens, Greece, Oct 2008
- PhD Degree, National Technical University of Athens, Athens, Greece, Sep 2008 – Jul 2012
- Post-graduate diploma, National Technical University of Athens, Athens, Greece, Sep 2008 – Apr 2010
- 5-year Diploma, National Technical University of Athens, Athens, Greece, Sep 2003 – Jun 2008

### Employment

- Lecturer, City University London, London, May 2017 – present
- Post-Doctoral Researcher (Marie Curie/Research Fellow), City University London, London, Feb 2013 – May 2017
- External Consultant on ESA-funded projects, Hellenic Technology of Robotics (HTR), Feb 2013 – Apr 2016
- Research Assistant, National Technical University of Athens, Athens, Sep 2008 – Jul 2012

### Awards

- Technical Chamber of Greece (2012)
**Award by the Technical Chamber of Greece for the undergraduate academic performance (12/9/2012 - first class student).** - Eugenides Foundation (2009)
**Post-graduate scholarship**

### Languages

English (can read, write, speak, understand spoken and peer review), French (can read, write, speak and understand spoken), German (can read and understand spoken) and Greek, Modern (1453-) (can read, write, speak, understand spoken and peer review).

## Research

### Research interests

Dr. Koukouvinis is working on the development, implementation and verification of computational models for multiphase flows with or without phase change. Emphasis has been given to the phenomena of cavitation, material erosion and liquid flashing taking into account real fluid thermodynamics and turbulence effects, with applications mainly in the area of fuel injection systems. Other areas of research involve compressible, multiphase flows with resolved interfaces, as e.g. in fundamental bubble dynamics, or incompressible multiphase flows, as in e.g. impulse hydraulic turbines. Dr. Koukouvinis has experience in numerical techniques (such as Finite Differences, Finite Volume, Finite Element, Smoothed Particle Hydrodynamics), programming (Fortran, C, with shared memory or distributed memory parallelization).

During the post-doctoral researcher period at City University, Dr. Koukouvinis participated in the FuelSystem3000 (Marie Curie Industry-Academia Partnerships and Pathways, EU Project ID: 324313, web-page: http://fuelsystem3000.eu/). The project focused on cavitation, compressible, multiphase flows, erosion and was mainly oriented towards (but not limited to) Diesel injectors. The main investigation subjects involved material erosion, turbulence interaction with cavitation, real-fluid thermodynamic effects, heat transfer in fuel system components and compressible multiphase flows (either resolved or diffuse-interface). Dr. Koukouvinis has also participated in experimental campaigns for cavitation and erosion measurement with novel techniques (e.g. X-ray densitometry, CT scans). Among the most important findings of his research is the formulation of a numerical model capable of quantitative predictions of cavitation presence and cavitation impact loads that can be related to material fatigue over time.

During the PhD candidate period at Laboratory of Hydraulic Turbomachines, Department of Fluids, NTUA, Dr. Koukouvinis was mainly involved in the Hydroaction project (EU Project ID: 211983, web site www.hydroaction.org). The project objective was the development of novel methodologies and design tools for optimizing impulse hydraulic turbines. His contribution to the project was the development of in-house CFD algorithms (based on the Smoothed Particle Hydrodynamics method, programmed in Fortran/C with shared memory parellism), setting up simulations with the available/developed software, conducting optimization studies for runner geometries/penstrock shapes, designing and manufacturing a turbine prototype runner (taking into account both fluid dynamic and structural aspects) and conducting laboratory measurements. Dr. Koukouvinis also provided assistance to partners/colleagues with the set-up of CFD simulations for Francis hydraulic turbines covering the whole analysis cycle and in research contracts for private companies (in particular (JV Aktor). Finally, he has been involved in the tutoring of under-graduate students during laboratory exercises in the Hydraulic Turbomachines lab.

## Publications

### Chapter

- Karathanassis, I.K., Koukouvinis, F.P. and Gavaises, M. (2020).
**Multiphase Phenomena in Diesel Fuel Injection Systems.***Energy, Environment, and Sustainability*(pp. 95–126). Springer Singapore. ISBN 978-981-15-0334-4.

### Conference papers and proceedings (16)

- Kyriazis, N., Koukouvinis, P., Karathanassis, I. and Gavaises, M. (2020).
**A tabulated data technique for cryogenic two-phase flows.** - Vidal, A., Koukouvinis, P. and Gavaises, M. (2019).
**On the effect of realistic multicomponent diesel surrogates on cavitation and in-nozzle flow.** - Brunhart, M., Soteriou, C., Daveau, C., Winterbourn, M., Gavaises, M. and Koukouvinis, P. (2019).
**Investigation on the removal of the cavitation erosion risk in a control orifice inside a prototype diesel injector.** - Gavaises, E., Cristofaro, M., Koukouvinis, F. and Edelbauer, W. (2018).
**Large Eddy Simulation of the internal injector flow during pilot injection.***10TH INTERNATIONAL SYMPOSIUM ON CAVITATION*14-18 May, Baltimore, USA. - Brunhart, M., Koukouvinis, F., Gavaises, E., Soteriou, C. and Daveau, C. (2018).
**Initial findings of an investigation on the removal of the cavitation erosion risk in a prototype control orifice inside a diesel injector.***10TH INTERNATIONAL SYMPOSIUM ON CAVITATION*14-18 May, Baltimore, USA. - Stavropoulos-Vasilakis, E., Koukouvinis, F., Gavaises, E. and Farhat, M. (2018).
**Cavitation Induction by Projectile Impacting on a Water Jet.***10TH INTERNATIONAL SYMPOSIUM ON CAVITATION*14-18 May, Baltimore, USA. - Murali-Girija, M., Koukouvinis, F., Karathanassis, I. and Gavaises, M. (2018).
**Simulating the effect of in-nozzle cavitation on liquid atomisation using a three-phase model.***10TH INTERNATIONAL SYMPOSIUM ON CAVITATION*14-16 May, Baltimore, USA. - Vidal Roncero, A., Gavaises, M., Rodriguez, C. and Koukouvinis, F. (2018).
**Effect of realistic multicomponent diesel surrogates on predicted in-nozzle flow and cavitation.** - (2018).
**Heating Effects During Bubble Collapse Using Tabulated Data.** - Karathanassis, I., Koukouvinis, P., Lorenzi, M., Kontolatis, E., Li, Z., Wang, J. … Gavaises, M. (2017).
**High-speed X-Ray Phase Contrast Imaging of String Cavitation in a Diesel Injector Orifice.***ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems*6-8 September. - Rodriguez, C., Vidal, A., Koukouvinis, P. and Gavaises, M. (2017).
**Supercritical and transcritical real-fluid mixing using the PC-SAFT EOS.***ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems*6-8 September. - Cristofaro, M., Edelbauer, W., Gavaises, M. and Koukouvinis, P. (2017).
**Numerical simulation of compressible cavitating two-phase flows with a pressure-based solver.***ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems*6-8 September. - Fostiropoulos, S.R., Malgarinos, I., Strotos, G., Nikolopoulos, N., Kakaras, E., Koukouvinis, P. … Gavaises, M. (2017).
**Numerical investigation of the role of heat transfer in bubble dynamics.***ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems*6-8 September. - Koukouvinis, P.K., Bergeles, G. and Gavaises, M. (2014).
**A new methodology for estimating cavitation erosion: Application on a high speed cavitation test RIG.** - Anagnostopoulos, J.S., Koukouvinis, P.K., Stamatelos, F.G. and Papantonis, D.E. (2012).
**Optimal design and experimental validation of a turgo model hydro turbine.** - Koukouvinis, P.K., Anagnostopoulos, J.S. and Papantonis, D.E. (2009).
**Turbulence modeling in smoothed particle hydrodynamics methodology: Application in nozzle flow.**

### Journal articles (53)

- Hwang, J., Weiss, L., Karathanassis, I.K., Koukouvinis, P., Pickett, L.M. and Skeen, S.A. (2020).
**Spatio-temporal identification of plume dynamics by 3D computed tomography using engine combustion network spray G injector and various fuels.***Fuel*,*280*. doi:10.1016/j.fuel.2020.118359. - Vidal, A., Koukouvinis, P. and Gavaises, M. (2020).
**Vapor-liquid equilibrium calculations at specified composition, density and temperature with the perturbed chain statistical associating fluid theory (PC-SAFT) equation of state.***Fluid Phase Equilibria*,*521*. doi:10.1016/j.fluid.2020.112661. - Koukouvinis, P., Vidal-Roncero, A., Rodriguez, C., Gavaises, M. and Pickett, L. (2020).
**High pressure/high temperature multiphase simulations of dodecane injection to nitrogen: Application on ECN Spray-A.***Fuel*,*275*. doi:10.1016/j.fuel.2020.117871. - Papoutsakis, A., Koukouvinis, P. and Gavaises, M. (2020).
**Solution of cavitating compressible flows using Discontinuous Galerkin discretisation.***Journal of Computational Physics*,*410*. doi:10.1016/j.jcp.2020.109377. - Nykteri, G., Koukouvinis, P., Gonzalez Avila, S.R., Ohl, C.D. and Gavaises, M. (2020).
**A Σ-ϒ two-fluid model with dynamic local topology detection: Application to high-speed droplet impact.***Journal of Computational Physics*,*408*. doi:10.1016/j.jcp.2019.109225. - Cristofaro, M., Edelbauer, W., Koukouvinis, P. and Gavaises, M. (2020).
**Influence of Diesel Fuel Viscosity on Cavitating Throttle Flow Simulations under Erosive Operation Conditions.***ACS Omega*,*5*(13), pp. 7182–7192. doi:10.1021/acsomega.9b03623. - Brunhart, M., Soteriou, C., Daveau, C., Gavaises, M., Koukouvinis, P. and Winterbourn, M. (2020).
**Cavitation erosion risk indicators for a thin gap within a diesel fuel pump.***Wear*,*442-443*. doi:10.1016/j.wear.2019.203024. - Cristofaro, M., Edelbauer, W., Koukouvinis, P. and Gavaises, M. (2020).
**A numerical study on the effect of cavitation erosion in a diesel injector.***Applied Mathematical Modelling*,*78*, pp. 200–216. doi:10.1016/j.apm.2019.09.002. - Rodriguez, C., Rokni, H.B., Koukouvinis, P., Gupta, A. and Gavaises, M. (2019).
**Complex multicomponent real-fluid thermodynamic model for high-pressure Diesel fuel injection.***Fuel*,*257*. doi:10.1016/j.fuel.2019.115888. - Mithun, M.G., Koukouvinis, P., Karathanassis, I.K. and Gavaises, M. (2019).
**Numerical simulation of three-phase flow in an external gear pump using immersed boundary approach.***Applied Mathematical Modelling*,*72*, pp. 682–699. doi:10.1016/j.apm.2019.03.022. - Stavropoulos Vasilakis, E., Kyriazis, N., Koukouvinis, P., Farhat, M. and Gavaises, M. (2019).
**Cavitation induction by projectile impacting on a water jet.***International Journal of Multiphase Flow*,*114*, pp. 128–139. doi:10.1016/j.ijmultiphaseflow.2019.03.001. - Rodriguez, C., Koukouvinis, P. and Gavaises, M. (2019).
**Simulation of supercritical diesel jets using the PC-SAFT EoS.***Journal of Supercritical Fluids*,*145*, pp. 48–65. doi:10.1016/j.supflu.2018.11.003. - Kyriazis, N., Koukouvinis, P. and Gavaises, M. (2019).
**Numerical investigations on bubble-induced jetting and shock wave focusing: Application on a needle-free injection.***Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences*,*475*(2222). doi:10.1098/rspa.2018.0548. - Gold, M., Pearson, R., Turner, J., Sykes, D., Stetsyuk, V., De Sercey, G. … Gavaises, M. (2019).
**Simulation and Measurement of Transient Fluid Phenomena within Diesel Injection.***SAE Technical Papers*,*2019-January*(January). doi:10.4271/2019-01-0066. - Naseri, H., Trickett, K., Mitroglou, N., Karathanassis, I., Koukouvinis, P., Gavaises, M. … Wang, J. (2018).
**Turbulence and Cavitation Suppression by Quaternary Ammonium Salt Additives.***Scientific Reports*,*8*(1). doi:10.1038/s41598-018-25980-x. - Rodriguez, C., Vidal, A., Koukouvinis, P., Gavaises, M. and McHugh, M.A. (2018).
**Simulation of transcritical fluid jets using the PC-SAFT EoS.***Journal of Computational Physics*,*374*, pp. 444–468. doi:10.1016/j.jcp.2018.07.030. - Karathanassis, I.K., Trickett, K., Koukouvinis, P., Wang, J., Barbour, R. and Gavaises, M. (2018).
**Illustrating the effect of viscoelastic additives on cavitation and turbulence with X-ray imaging.***Scientific Reports*,*8*(1). doi:10.1038/s41598-018-32996-w. - Kyriazis, N., Koukouvinis, P. and Gavaises, M. (2018).
**Modelling cavitation during drop impact on solid surfaces.***Advances in Colloid and Interface Science*,*260*, pp. 46–64. doi:10.1016/j.cis.2018.08.004. - Koukouvinis, P., Kyriazis, N. and Gavaises, M. (2018).
**Smoothed particle hydrodynamics simulation of a laser pulse impact onto a liquid metal droplet.***PLoS ONE*,*13*(9). doi:10.1371/journal.pone.0204125. - Zeng, Q., Gonzalez-Avila, S.R., Dijkink, R., Koukouvinis, P., Gavaises, M. and Ohl, C.D. (2018).
**Wall shear stress from jetting cavitation bubbles.***Journal of Fluid Mechanics*,*846*, pp. 341–355. doi:10.1017/jfm.2018.286. - Mithun, M.-.G., Koukouvinis, P. and Gavaises, M. (2018).
**Numerical simulation of cavitation and atomization using a fully compressible three-phase model.***Physical Review Fluids*,*3*(6). doi:10.1103/physrevfluids.3.064304. - Koukouvinis, P., Strotos, G., Zeng, Q., Gonzalez-Avila, S.R., Theodorakakos, A., Gavaises, M. … Ohl, C.D. (2018).
**Parametric Investigations of the Induced Shear Stress by a Laser-Generated Bubble.***Langmuir*,*34*(22), pp. 6428–6442. doi:10.1021/acs.langmuir.8b01274. - Karathanassis, I.K., Koukouvinis, P., Kontolatis, E., Lee, Z., Wang, J., Mitroglou, N. … Gavaises, M. (2018).
**High-speed visualization of vortical cavitation using synchrotron radiation.***Journal of Fluid Mechanics*,*838*, pp. 148–164. doi:10.1017/jfm.2017.885. - Koukouvinis, P., Karathanassis, I.K. and Gavaises, M. (2018).
**Prediction of cavitation and induced erosion inside a high-pressure fuel pump.***International Journal of Engine Research*,*19*(3), pp. 360–373. doi:10.1177/1468087417708137. - Naseri, H., Koukouvinis, P., Malgarinos, I. and Gavaises, M. (2018).
**On viscoelastic cavitating flows: A numerical study.***Physics of Fluids*,*30*(3). doi:10.1063/1.5011978. - Vidal, A., Rodriguez, C., Koukouvinis, P., Gavaises, M. and McHugh, M.A. (2018).
**Modelling of Diesel fuel properties through its surrogates using Perturbed-Chain, Statistical Associating Fluid Theory.***International Journal of Engine Research*. doi:10.1177/1468087418801712. - Koukouvinis, F., Bruecker, C. and Gavaises, M. (2017).
**Unveiling the physical mechanism behind pistol shrimp cavitation.***Nature Scientific Reports*,*7*(1). doi:10.1038/s41598-017-14312-0. - Karathanassis, I.K., Koukouvinis, P. and Gavaises, M. (2017).
**Comparative evaluation of phase-change mechanisms for the prediction of flashing flows.***International Journal of Multiphase Flow*,*95*, pp. 257–270. doi:10.1016/j.ijmultiphaseflow.2017.06.006. - Koukouvinis, P., Mitroglou, N., Gavaises, M., Lorenzi, M. and Santini, M. (2017).
**Quantitative predictions of cavitation presence and erosion-prone locations in a high-pressure cavitation test rig.***Journal of Fluid Mechanics*,*819*, pp. 21–57. doi:10.1017/jfm.2017.156. - Koukouvinis, P., Naseri, H. and Gavaises, M. (2017).
**Performance of turbulence and cavitation models in prediction of incipient and developed cavitation.***International Journal of Engine Research*,*18*(4), pp. 333–350. doi:10.1177/1468087416658604. - Kyriazis, N., Koukouvinis, P. and Gavaises, M. (2017).
**Numerical investigation of bubble dynamics using tabulated data.***International Journal of Multiphase Flow*,*93*, pp. 158–177. doi:10.1016/j.ijmultiphaseflow.2017.04.004. - Koukouvinis, P., Gavaises, M., Li, J. and Wang, L. (2016).
**Large Eddy Simulation of Diesel injector including cavitation effects and correlation to erosion damage.***Fuel*,*175*, pp. 26–39. doi:10.1016/j.fuel.2016.02.037. - Koukouvinis, P., Gavaises, M., Supponen, O. and Farhat, M. (2016).
**Simulation of bubble expansion and collapse in the vicinity of a free surface.***Physics of Fluids*,*28*(5). doi:10.1063/1.4949354. - Koukouvinis, P., Gavaises, M., Supponen, O. and Farhat, M. (2016).
**Numerical simulation of a collapsing bubble subject to gravity.***Physics of Fluids*,*28*(3). doi:10.1063/1.4944561. - Koukouvinis, P., Gavaises, M., Georgoulas, A. and Marengo, M. (2016).
**Compressible simulations of bubble dynamics with central-upwind schemes.***International Journal of Computational Fluid Dynamics*,*30*(2), pp. 129–140. doi:10.1080/10618562.2016.1166216. - Karathanassis, I.K., Koukouvinis, P. and Gavaises, M. (2016).
**Topology and distinct features of flashing flow in an injector nozzle.***Atomization and Sprays*,*26*(12), pp. 1307–1336. doi:10.1615/AtomizSpr.2016016510. - Koukouvinis, P., Gavaises, M., Georgoulas, A. and Marengo, M. (2015).
**Compressible bubble dynamic simulations with central-upwind schemes.***Journal of Physics: Conference Series*,*656*(1). doi:10.1088/1742-6596/656/1/012087. - Naseri, H., Koukouvinis, P. and Gavaises, M. (2015).
**Evaluation of Turbulence Models Performance in Predicting Incipient Cavitation in an Enlarged Step-Nozzle.***Journal of Physics: Conference Series*,*656*(1). doi:10.1088/1742-6596/656/1/012095. - Salemi, R., Koukouvinis, P., Strotos, G., McDavid, R., Wang, L., Li, J. … Gavaises, M. (2015).
**Evaluation of friction heating in cavitating high pressure Diesel injector nozzles.***Journal of Physics: Conference Series*,*656*(1). doi:10.1088/1742-6596/656/1/012083. - Koukouvinis, P., Gavaises, M., Li, J. and Wang, L. (2015).
**Large Eddy Simulation of diesel injector opening with a two phase cavitation model.***Journal of Physics: Conference Series*,*656*(1). doi:10.1088/1742-6596/656/1/012088. - Koukouvinis, P. and Gavaises, M. (2015).
**Simulation of throttle flow with two phase and single phase homogenous equilibrium model.***Journal of Physics: Conference Series*,*656*(1). doi:10.1088/1742-6596/656/1/012086. - Georgoulas, A., Koukouvinis, P., Gavaises, M. and Marengo, M. (2015).
**Numerical investigation of quasi-static bubble growth and detachment from submerged orifices in isothermal liquid pools: The effect of varying fluid properties and gravity levels.***International Journal of Multiphase Flow*,*74*, pp. 59–78. doi:10.1016/j.ijmultiphaseflow.2015.04.008. - Strotos, G., Koukouvinis, P., Theodorakakos, A., Gavaises, M. and Bergeles, G. (2015).
**Transient heating effects in high pressure Diesel injector nozzles.***International Journal of Heat and Fluid Flow*,*51*, pp. 257–267. doi:10.1016/j.ijheatfluidflow.2014.10.010. - Gavaises, M., Villa, F., Koukouvinis, P., Marengo, M. and Franc, J.P. (2015).
**Visualisation and les simulation of cavitation cloud formation and collapse in an axisymmetric geometry.***International Journal of Multiphase Flow*,*68*, pp. 14–26. doi:10.1016/j.ijmultiphaseflow.2014.09.008. - Bergeles, G., Koukouvinis, F., Gavaises, M., Li, J. and Wang, L. (2015).
**An Erosion Aggressiveness Index (EAI) Based on Pressure Load Estimation Due to Bubble Collapse in Cavitating Flows Within the RANS Solvers.***SAE International Journal of Engines*,*8*(5). doi:10.4271/2015-24-2465. - Koukouvinis, P., Bergeles, G. and Gavaises, M. (2015).
**A cavitation aggressiveness index within the Reynolds averaged Navier Stokes methodology for cavitating flows.***Journal of Hydrodynamics*,*27*(4), pp. 579–586. doi:10.1016/S1001-6058(15)60519-4. - Koukouvinis, P.K., Anagnostopoulos, J.S. and Papantonis, D.E. (2013).
**Simulation of 2D wedge impacts on water using the SPH-ALE method.***Acta Mechanica*,*224*(11), pp. 2559–2575. doi:10.1007/s00707-013-0885-3. - Koukouvinis, P.K., Anagnostopoulos, J.S. and Papantonis, D.E. (2013).
**An improved MUSCL treatment for the SPH-ALE method: Comparison with the standard SPH method for the jet impingement case.***International Journal for Numerical Methods in Fluids*,*71*(9), pp. 1152–1177. doi:10.1002/fld.3706. - Koukouvinis, P.K., Anagnostopoulos, J.S. and Papantonis, D.E. (2011).
**SPH method used for flow predictions at a Turgo impulse turbine: Comparison with fluent.***World Academy of Science, Engineering and Technology*,*79*, pp. 659–666. - Kyriazis, N., Koukouvinis, F. and Gavaises, E.
**Modelling cavitation during drop impact on solid**

surfaces.*Advances in Colloid and Interface Science*,*260*, pp. 46–64. doi:10.1016/j.cis.2018.08.004. - Nazeer, Y.H., Ehmann, M., Koukouvinis, F. and Gavaises, M.
**The Influence of geometrical and operational parameters on internal flow characteristics of Internally Mixing Twin-Fluid Y-Jet Atomizers.***Atomization and Sprays*. doi:10.1615/atomizspr.2019030944. - Brunhart, M., Soteriou, C., Gavaises, M., Karathanassis, I., Koukouvinis, F., Jahangir, S. … Poelma, C.
**Investigation of cavitation and vapor shedding mechanisms in a Venturi nozzle.***Physics of Fluids*. - Stefanitsis, D., Koukouvinis, F., Nikolopoulos, N. and Gavaises, M.
**Numerical investigation of the aerodynamic droplet breakup at Mach numbers>1.***Journal of Energy Engineering*.

## Education

### Teaching activities

ME1109 Engineering Science 1: Thermodynamics (2017), City, University of London

ME2109 Engineering Science 2: Thermodynamics (2013) - tutorials, City, University of London

Laboratory tutorials, Department of Fluids, School of Mechanical Engineering, NTUA