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 modelling in Large-Eddy Simulations, with application to supersonic ejectors
Romain Debroeyer

The goal of this research is to perform high fidelity Large-Eddy Simulations (LES) of supersonic ejectors. These simulations will give a better understanding of the unsteady phenomena occurring in the ejector and how it transitions from on to off-design operation. Wall models for those LES simulations will be implemented so as to decrease the number of grid points required and hence decrease the simulation time.

Recent publications

See complete list of publications

Journal Articles

1. Angielczyk, W.; Bartosiewicz, Yann; Butrymowicz, D. Development of delayed equilibrium model for CO2 convergent-divergent nozzle transonic flashing flow. In: International Journal of Multiphase Flow, (2019). (Soumis).

2. Angielczyk, W.; Seynhaeve, Jean-Marie; Gagan, Jerzy; Bartosiewicz, Yann; Butrymowicz, Dariusz. Prediction of critical mass rate of flashing carbon dioxide in convergent-divergent nozzle. In: Chemical Engineering & Processing, Vol. 143, p. 107599 (2019). doi:10.1016/j.cep.2019.107599.

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, (2020). (Soumis).

4. 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).

5. Shams, Afaque; Roelofs, Ferry; Ničeno, Bojan; Guo, W.; Angeli, Diego; Stalio, Enrico; Fregni, Andrea; Duponcheel, Matthieu; Bartosiewicz, Yann; Tiselj, Iztok; Oder, Jure. Reference numerical database for turbulent flow and heat transfer in liquid metals. In: Nuclear Engineering and Design, Fusion, Vol. 353, no. 110274 (November 2019). doi:10.1016/j.nucengdes.2019.110274.

6. Shams, A.; Roelofs, F.; Tiselj, I.; Oder, J.; Bartosiewicz, Yann; Duponcheel, Matthieu; Niceno, B.; Guo, W.; Stalio, E.; Angeli, D.; Buckingham, Sophia; Koloszar, L.K.; Ortiz, A.V.; Planquart, P.; Narayannan, C.; van Tichelen, K.; Jager, W.; Schaub, T. A collaborative effort towards the accurate prediction of turbulent flow and heat transfer in low-Prandtl number fluids. In: Nuclear Engineering and Design, Fusion, (2019). (Accepté/Sous presse).

7. Fang, Yu; Poncet, Sébastien; Nesreddine, Hakim; Bartosiewicz, Yann. An open-source density-based solver for two-phase CO2 ows: applications to Laval nozzles. In: International Journal of Refrigeration, Vol. 106, p. 526-538 (2019). doi:10.1016/j.ijrefrig.2019.05.016.

8. 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).

9. 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.

10. 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.

Conference Papers

1. Bartosiewicz, Yann. High Fidelity Simulations in Support to Assess and Improve RANS for Modeling Turbulent Heat Transfer in Liquid Metals: the Case of Forced Convection.

2. Buckingham, S.; Koloszar, L.; Villa Ortiz, A.; Bartosiewicz, Yann; Winckelmans, Grégoire. LES investigation of Prandtl number effects over a backward facing step and consequences in terms of best practice guidelines for RANS.

3. 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.

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

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

6. 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.

7. 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.

8. Buckingham, Sophia; Koloszar; Bartosiewicz, Yann; Winckelmans, Grégoire. Large-eddy simulation of turbulent heat transfer at low prandtl number over a backward facing step.

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

10. 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.

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.