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Contact Information

Contact

Postal Address

City, University of London
Northampton Square
London
EC1V 0HB
United Kingdom

About

Overview

Dr. 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

  1. Member, Technical Chamber of Greece, Athens, Greece, Oct 2008
  2. PhD Degree, National Technical University of Athens, Athens, Greece, Sep 2008 – Jul 2012
  3. Post-graduate diploma, National Technical University of Athens, Athens, Greece, Sep 2008 – Apr 2010
  4. 5-year Diploma, National Technical University of Athens, Athens, Greece, Sep 2003 – Jun 2008

Employment

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

Awards

  1. Technical Chamber of Greece (2012) Award by the Technical Chamber of Greece for the undergraduate academic performance (12/9/2012 - first class student).
  2. 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

Conference paper/proceedings

  1. Koukouvinis, P.K., Bergeles, G. and Gavaises, M. (2014). A new methodology for estimating cavitation erosion: Application on a high speed cavitation test RIG.

Journal articles (19)

  1. 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.
  2. Koukouvinis, P., Strotos, G., Zeng, Q., Gonzalez-Avila, S.R., Theodorakakos, A., Gavaises, M. … Dieter-Ohl, C. (2018). Parametric investigations of the induced shear stress by a laser generated bubble. Langmuir. doi:10.1021/acs.langmuir.8b01274.
  3. 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.
  4. 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.
  5. Koukouvinis, P., Bruecker, C. and Gavaises, M. (2017). Unveiling the physical mechanism behind pistol shrimp cavitation. Scientific Reports, 7(1). doi:10.1038/s41598-017-14312-0.
  6. 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.
  7. 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.
  8. 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.
  9. 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.
  10. 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.
  11. 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.
  12. 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.
  13. 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.
  14. 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.
  15. 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.
  16. 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.
  17. 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.
  18. 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.
  19. 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.

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