Yann Bartosiewicz
Recent publications

obtained his PhD in mechanical engineering from U. of Sherbrooke, Canada in 2003. After a position of research scientist at Natural Ressources Canada, he joined UCL in september 2005 as assistant professor. Since 2013 he is associate professor at UCL in the division of thermodynamics and fluid mechanics (TFL) which he lead between 2012-2016. His teaching duties include thermodynamics, thermal cycles and nuclear thermal-hydraulics. He is also an academic member of the Belgian Nuclear Education Network (BNEN) which he chaired between 2012-2016.

His research interest covers numerical simulation and experiment in thermodynamic, fluid mechanics and heat transfer for applications in energy systems and nuclear thermal-hydraulics.

For energy systems his research focusses on the investigation of supersonic ejectors to be used in waste heat recovery technologies as well as two-phase ejectors to be used in heat pumps. Those investigations are carried out at the component scale by as well as at the system scale. In both cas a balance is achieved between numerical simulations (CFD, system modeling) and experiments (local flow measurement/visualization within an ejector and full system experiment). In this field the collaborations includes Natural ressources Canada, University of Sherbrooke, Georgia Institute of Technology, University of Firenze, EDF (Electricité De France), Polish academy of sciences.

For nuclear thermal-hydraulics, the research is essentially conducted by numerical simulation. The main research topic concerning GENII/GENIII reactors is the simulation of two-phase choking occurring during the flashing of a liquid (application to a Loss of Coolant Accident) other two-phase flows situation related to safety. For future reactors (GENIV) the research is focussed on the simulation of turbulent heat transfer in liquid metals under different conditions; this includes direct numerical simulations (DNS), Large-Eddy Simulation (LES) and Reynolds Averaged Simulation (RANS). This research in thermal-hydraulics is essentially achieved through the participation in EU projects with many collaborators (EDF, CEA, NRG, SCK•CEN, VKI, etc.).

Research group(s): TFL

PhD and Post-doc researchers under my supervision:

Wall-modeling in LES, with application to supersonic ejectors
Romain Debroeyer

Recent publications

See complete list of publications

Journal Articles

1. Angielczyk, W.; Seynhaeve, Jean-Marie; Gagan, J.; Bartosiewicz, Yann; Butrymowicz, D. Friction factor influence on 1-D modelling of steady-state transonic two-phase carbon dioxide flow. In: International Journal of Multiphase Flow, (2019). (Soumis).

2. Lamberts, Olivier; Chatelain, Philippe; Bartosiewicz, Yann. Numerical and experimental evidence of the Fabri-choking in a supersonic ejector. In: International Journal of Heat and Fluid Flow, Vol. 69, p. 194-209 (2018). doi:10.1016/J.IJHEATFLUIDFLOW.2018.01.002.

3. De Lorenzo, M.; Pantono, A.; Pelanti, M.; Seynhaeve, Jean-Marie; Di Matteo, Michele; Lafon, P.; Bartosiewicz, Yann. a hyperbolic phase-transition model coupled to tabulated EoS for metastable two-phase flows. In: Computers and Fluids, (2019). (Soumis).

4. Buckingham, Sophia; Planquart, P.; Spaccapanicca, C.; Bartosiewicz, Yann; Winckelmans, Grégoire. Investigation of probe limitation effects by LES of unconfined backward-facing step flows at moderate Prandtl numbers. In: Flow, Turbulence and Combustion, (2018). (Soumis).

5. Fang, Yu; De Lorenzo, Marco; Lafon, Philippe; Poncet, Sébastien; Bartosiewicz, Yann. an accurate and efficient look-up table equation of state for two-phase compressible flow simulations of carbon dioxide. In: Industrial & Engineering Chemistry Research, , no.57, p. 7676-7691 (2018). doi:10.1021/acs.iecr.8b00507.

6. Lamberts, Olivier; Chatelain, Philippe; Bourgeois, Nicolas; Bartosiewicz, Yann. The compound-choking theory as an explanation of the entrainment limitation in supersonic ejectors. In: Energy, Vol. 158, p. 524-536 (2018). doi:10.1016/

7. Lamberts, Olivier; Chatelain, Philippe; Bartosiewicz, Yann. New methods for analyzing transport phenomena in supersonic ejectors. In: International Journal of Heat and Fluid Flow, Vol. 64, p. 23-40. doi:10.1016/j.ijheatfluidflow.2017.01.009.

8. De Lorenzo, Marco; Lafon, Philippe; Di Matteo, Michele; Pelanti, Marica; Seynhaeve, Jean-Marie; Bartosiewicz, Yann. Homogeneous Two-Phase Flow Models and Accurate Steam-Water Table Look-up Method for Fast Transient Simulations. In: International Journal of Multiphase Flow, Vol. 95, p. 199-219 (October 2017). doi:10.1016/j.ijmultiphaseflow.2017.06.001.

9. De Lorenzo, Marco; Lafon, Philippe; Seynhaeve, Jean-Marie; Bartosiewicz, Yann. Benchmark of Delayed Equilibrium Model (DEM) and Classic Two-Phase Critical Flow Models against Experimental Data. In: International Journal of Multiphase Flow, Vol. 92, p. 112-130 (June 2017). doi:10.1016/j.ijmultiphaseflow.2017.03.004.

10. Duponcheel, Matthieu; Mimouni, Stéphane; Fleau, Solène; Bartosiewicz, Yann. Experimental and numerical investigations of a two-phase wavy flow. In: Nuclear Engineering and Design, Vol. 321, p. 199-218 (September 2017). doi:10.1016/j.nucengdes.2016.10.031.

Conference Papers

1. Buckingham, Sophia; Koloszar, L.; Villa Ortiz, Agustin; Bartosiewicz, Yann; Winckelmans, Grégoire. LES Investigation of Prandtl Number Effects over a Backward Facing Step and Consequences for best Prtactice in Rans.

2. van Tichelen, K.; Jäger, W.; Schaub, T.; Koloszar, L.K.; Ortiz, A.V.; Planquart, P.; Narayanan, C.; Shams, A.; Roelofs, F.; Tiselji, I.; Oder, J.; Bartosiewicz, Yann; Duponcheel, Matthieu; Niceno, B.; Guo, W.; Stalio, E.; Angeli, D.; Buckingham, Sophia. A Collaborative Effort Towards the Accurate Prediction of Flow and Heat transfers in Low-Prandtl Fluids.

3. Duponcheel, Matthieu; Bartosiewicz, Yann. Direct Numerical Simulations of Low-Prandtl Turbulent Heat Transfer in Planar Impinging Jets.

4. Bartosiewicz, Yann. Reconciling FCD and thermodynamics to understand transfer in supersonic ejectors.

5. Fang, Yu; De Lorenzo, Marco; Lafon, Philippe; Poncet, Sébastien; Bartosiewicz, Yann; Nesreddine, Hakim. Fast and accurate CO2 properties calculation algorithm for massive numerical simulations of supersonic two-phase ejectors.

6. Lamberts, Olivier; Chatelain, Philippe; Bartosiewicz, Yann. Experimental and Numerical Analysis of the Flow within a Supersonic Ejector.

7. Bartosiewicz, Yann. Large Eddy SImulation for Heat transfer in liguid metals.

8. Duponcheel, Matthieu; Bartosiewicz, Yann. Low Prandtl Turbulent Heat Transfer in Unconfined or Wall-Bounded Configurations: DNS of a Mixing Layer and of an Impinging Jet.

9. Bartosiewicz, Yann; Duponcheel, Matthieu. Large Eddy Simulation for Heat transfer in liquid metals.

10. Lorieul, Gaël; Chatelain, Philippe; Bartosiewicz, Yann. Low-Prandtl heat transfer in free-surface flows: assessment of a Vortex Particle Mesh method.

Book Chapters

1. Bartosiewicz, Yann; Duponcheel, Matthieu. Large Eddy Simulation: Application to Liquid Metal Fluid Flow and Heat Transfer. In: Thermal Hydraulics Aspects of Liquid Metal Cooled Nuclear Reactors , Woodhead Publishing, 2018. 9780081019818. doi:10.1016/B978-0-08-101980-1.00017-X.