Yann Bartosiewicz
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View article: An extension of the compound flow theory with friction between the streams and at the wall
An extension of the compound flow theory with friction between the streams and at the wall Open
Compound flows consist of two or more parallel compressible streams in a duct and their theoretical treatment has gained attention for the analysis and modelling of ejectors. Recent works have shown that these flows can experience choking …
View article: Investigation on ejector design for CO2 heat pump applications us-ing Dymola
Investigation on ejector design for CO2 heat pump applications us-ing Dymola Open
In this paper, the Dymola modelling tool is used to study the influence of ejector design onto the whole heat pump cycle working with carbon dioxide. The cycle is built using the components provided by the TIL Modelica library. It is found…
View article: Data-driven turbulent heat flux modeling with inputs of multiple fidelity
Data-driven turbulent heat flux modeling with inputs of multiple fidelity Open
Data-driven RANS modeling is emerging as a promising methodology to exploit the information provided by high-fidelity data. However, its widespread application is limited by challenges in generalization and robustness to inconsistencies be…
View article: Numerical simulations of bubbly turbulent convection in cubical geometries
Numerical simulations of bubbly turbulent convection in cubical geometries Open
In this work we present numerical results of pool boiling flow in a turbulent Rayleigh-Bénard convection configuration, using our in-house code in a cubical geometry. The problem in hand is encountered in various natural phenomena as well …
View article: An extension of the compound flow theory with friction between the streams and at the wall
An extension of the compound flow theory with friction between the streams and at the wall Open
Compound flows consist of two or more parallel compressible streams in a duct and their theoretical treatment has gained attention for the analysis and modelling of ejectors. Recent works have shown that these flows can experience choking …
View article: Air Ejector Analysis in Extended Operational Perimeter for Control Oriented Simulation of Bleed-Air Aircraft Systems
Air Ejector Analysis in Extended Operational Perimeter for Control Oriented Simulation of Bleed-Air Aircraft Systems Open
The integration of large size Ultra High Bypass Ratio (UHBR) engines introduces new restrictions of space for their integration with the aircraft wing. Under this scenario, a reduction of the size of the bleed air system and particularly o…
View article: A fast tabulated equation of state for CFD simulation of two-phaseflows
A fast tabulated equation of state for CFD simulation of two-phaseflows Open
One of the challenging aspects when performing CFD of multi-phase flows is the modeling of the fluid equation of state, used to close the system of equations. Firstly, one must define a model to handle the two-phase behavior of the fluid, …
View article: A Machine Learning-Based Calibration of a 1D Ejector Model from CFD
A Machine Learning-Based Calibration of a 1D Ejector Model from CFD Open
Ejectors are devices that expand a primary flow through a nozzle to entrain and compress a secondary flow without moving parts. They can be modelled in 1D as two streams exchanging momentum. However, the engineering modelling of this excha…
View article: NUMERICAL STUDY OF THE COMPLETE OPERATING MAP OF EJECTORS IN ULTRA HIGH BYPASS RATIO ENGINE BLEED SYSTEMS
NUMERICAL STUDY OF THE COMPLETE OPERATING MAP OF EJECTORS IN ULTRA HIGH BYPASS RATIO ENGINE BLEED SYSTEMS Open
New bleed systems are needed for the aircraft based on Ultra High Bypass Ratio (UHBR) engines to improve its overall efficiency, and one of the solutions is to utilize air ejectors to optimize the bleed air system. The present numerical st…
View article: Calibration of the 0D model of an air ejector by means of compressible RANS simulations
Calibration of the 0D model of an air ejector by means of compressible RANS simulations Open
This work analyzes the need to perform a series of CFD simulations in order to calibrate 0D ejector models. The proposed case study consists in the analysis of a supersonic air ejector used in the aeronautical field to improve the efficien…
View article: A 0D APPROACH FOR EXTENDED OPERATIONAL MODELING OF AIR EJECTORS IN THERMAL SYSTEMS
A 0D APPROACH FOR EXTENDED OPERATIONAL MODELING OF AIR EJECTORS IN THERMAL SYSTEMS Open
Classic ejector models work accurately only in normal operating conditions, i.e. when the primary flow is in supercritical conditions. Moreover, they do not take into account abnormal situations, such as when the primary flow is subsonic o…
View article: CALIBRATION OF A 1D EJECTOR MODEL FROM FULL-SCALE EXPERIMENTS
CALIBRATION OF A 1D EJECTOR MODEL FROM FULL-SCALE EXPERIMENTS Open
We present the calibration of a 1D ejector model on experimental data from a large-scale ejector facility at the von Karman Institute. The facility allows for adjusting the inlet pressures (with pressure ratios up to 5) and temperatures (w…
View article: A 1D Model for the Unsteady Gas Dynamics of Ejectors
A 1D Model for the Unsteady Gas Dynamics of Ejectors Open
We propose a 1D unsteady model for supersonic single-phase ejectors. The model treats an ejector as a pipe network with two inputs and one output and combines a 1D gas dynamics formulation in each `pipe' with a junction model for entrainme…
View article: Physics-constrained machine learning for thermal turbulence modelling at low Prandtl numbers
Physics-constrained machine learning for thermal turbulence modelling at low Prandtl numbers Open
Liquid metals play a central role in new generation liquid metal cooled nuclear reactors, for which numerical investigations require the use of appropriate thermal turbulence models for low Prandtl number fluids. Given the limitations of t…
View article: A density-based solver using real gas properties for R744 supersonic flashing simulations.
A density-based solver using real gas properties for R744 supersonic flashing simulations. Open
A density-based solver based on the OpenFoam library is coupled with a tabulated equation of state which allows to accurately compute the properties of CO2 at a reduced computational cost. The homogeneous equilibrium model (HEM) is conside…