Proceedings of the 4th International Seminar on Non-Ideal Compressible Fluid Dynamics for Propulsion and Power (ERCOFTAC Series, 29)

Preface
Contents
Fundamentals
Adaptive Simulations of Cylindrical Shock Waves in Polytropic van der Waal Gas
	1 Introduction
	2 The Numerical Method
		2.1 The Unsteady Adaptive Finite Volume Scheme
		2.2 Characterization of Converging Shock Waves
	3 Results
	4 Conclusions
	References
Non-ideal Compressible Flows in Radial Equilibrium
	1 Introduction
	2 Scope of Research
	3 Compressible Flows at Radial Equilibrium
	4 Results
		4.1 Ideal Gas
		4.2 Non-ideal Gas
	5 Conclusions
	References
Data-Driven Regression of Thermodynamic Models in Entropic Form
	1 Introduction
	2 Methodology
		2.1 Fundamental Relation in Entropic Form
		2.2 Data-Driven Modeling of Thermodynamic Properties
	3 Results
		3.1 CFD Analysis
	4 Conclusions and Future Works
	References
Numerical Modelling and Methods
Direct Numerical Simulation of Wall-Bounded Turbulence at High-Pressure Transcritical Conditions
	1 Introduction
	2 Flow Physics and Numerical Modeling Framework
		2.1 Equations of Fluid Motion
		2.2 Real-Gas Thermodynamics
		2.3 High-Pressure Transport Coefficients
		2.4 Numerical Scheme
	3 Computational Results
		3.1 Problem Setup
		3.2 Flow Statistics
	4 Conclusions and Future Work
	References
Development, Validation and Application of an ANN-Based Large Eddy Simulation Subgrid-Scale Turbulence Model for Dense Gas Flows
	1 Introduction
	2 Methodology: Development of an ANN Model for the Subgrid-Scale Reynolds Tensor in LES
		2.1 Description of the Database
		2.2 Choice of the Input Variables
		2.3 Optimization of the Hyperparameters
		2.4 Analysis of the Training Process
	3 Results: Validation of the ANN-Based Turbulent Closure Model
		3.1 Mixing Layer at Convective Mach Number of 2.2
		3.2 Annular Stator Case
	4 Conclusions and Future Works
	References
Bypass Laminar-Turbulent Transition on a Flat Plate of Organic Fluids Using DNS Method
	1 Introduction
	2 Methodology
	3 Cases Setup
		3.1 Air Cases
		3.2 Organic Fluids Cases
	4 Results
		4.1 Skin Friction
		4.2 Energy Spectra
		4.3 Vortex Structures
		4.4 Instantaneous Fluctuation Field
		4.5 Conclusions
	References
High Fidelity Simulations and Modelling of Dissipation in Boundary Layers of Non-ideal Fluid Flows
	1 Introduction
	2 Theoretical Background
	3 Methodology
	4 Results
		4.1 Analysis of Dissipation Based on DNS
		4.2 Comparison DNS-ROM
	5 Conclusion
	References
Estimating Model-Form Uncertainty in RANS Turbulence Closures for NICFD Applications
	1 Introduction
	2 Methodology
	3 Results
		3.1 Test Case Specification
		3.2 Test A
		3.3 Test B
	4 Conclusions and Future Works
	References
Assessment of Density and Compressibility Corrections for RANS Simulations of Real Gas Flows Using SU2
	1 Introduction
	2 Methodology
		2.1 Original SA Model
		2.2 Mixing Layer Compressibility Correction
		2.3 Edwards\' Correction
		2.4 Eddy Viscosity Convection and Density Correction
		2.5 Martin-Hou Equation of State
	3 Results
		3.1 Numerical Setup for the Supersonic Flat Plate Boundary Layer
		3.2 Velocity Profiles and Transport Equation Budget
		3.3 Compressible Turbulent Mixing Layer
	References
Validation of the SU2 Fluid Dynamic Solver for Isentropic Non-Ideal Compressible Flows
	1 Introduction
	2 Model Definition and Validation Methodology
		2.1 Validation Experiment
		2.2 CFD Model
	3 Model Uncertainties
		3.1 Computational Framework for CFD Solver Validation
	4 Results
	5 Conclusions
	References
Multi-phase Flows
Numerical Validation of a Two-Phase Nozzle Design Tool Based on the Two-Fluid Model Applied to Wet-to-Dry Expansion of Organic Fluids
	1 Introduction
	2 Methodology
		2.1 Two-Fluid Model
		2.2 Droplet Size
		2.3 Quasi-1D TFM Nozzle Design Tool
		2.4 Numerical Setup
	3 Results
	4 Conclusions and Future Works
	References
Numerical Modelling of Cryogenic Flows Under Near-Vacuum Pressure Conditions
	1 Introduction
	2 Scope of Research
	3 Main Research Issues
	4 Methodology
	5 Results
		5.1 Liquid Oxygen Spray Formation
		5.2 Liquid Nitrogen Spray Formation
	6 Conclusions and Future Works
	References
About the Effect of Two-Phase Flow Formulations on Shock Waves in Flash Metastable Expansions Simulations
	1 Introduction
	2 Methods and Equations
		2.1 Models and Definitions
		2.2 CFD Simulation Configuration
		2.3 Speed of Sound
	3 Test Case
	4 Simulation Results
		4.1 Pressure Profiles
		4.2 Velocities
	5 Conclusions and Future Works
	References
Non-equilibrium Phenomena in Two-Phase Flashing Flows of Organic Fluids
	1 Introduction
	2 Sources of Non-equilibrium in Flashing Flows
	3 Methods
		3.1 One-Dimensional Model
		3.2 Case Study and Experimental Data
	4 Results and Discussion
	5 Conclusions and Future Work
	References
A Pressure-Based Model for Two-Phase Flows Under Generic Equations of State
	1 Introduction
	2 The Model
		2.1 The Low-Mach Scaling
		2.2 Thermodynamic Model
	3 Numerical Method
		3.1 Hyperbolic Operator in 1D: A Semi-implicit Staggered Scheme
		3.2 Source Operator
		3.3 Hyperbolic Operator in 2D: A Fully-Explicit Co-Located Scheme
	4 Results
	5 Conclusions and Future Works
	References
Validation and Application of HEM for Non-ideal Compressible Fluid Dynamic
	1 Introduction
	2 Governing Equation
	3 Numerical Tests
		3.1 Shock-Tubes Problem in a Duct with Constant Cross-Section
		3.2 Shock-Tubes Problem with an Abrupt Change of Area
		3.3 Modified Shu-Osher Problem
		3.4 Converge and Diverge Nozzle
	4 Conclusions and Future Works
	References
Reacting Flows
Numerical Simulations of Real-Fluid Reacting Sprays at Transcritical Pressures Using Multiphase Thermodynamics
	1 Introduction
	2 Main Research Issues
	3 Methodology
		3.1 Multiphase Thermodynamics
		3.2 Multiphase Transport
		3.3 Real-fluid Chemistry
		3.4 Numerical Discretization
	4 Results
	5 Conclusions and Future Work
	References
Experiments
Grid-Generated Decaying Turbulence in an Organic Vapour Flow
	1 Introduction
	2 Experimental Setup
	3 Numerical Method
	4 Results and Discussion
	5 Conclusions
	References
Study on the Operation of the LUTsCO2 Test Loop with Pure CO2 and CO2 + SO2 Mixture Through Dynamic Modeling
	1 Introduction
	2 LUTsCO2 Test Loop
	3 Thermodynamic Properties of CO2-SO2 Mixtures
	4 Mathematical Models
		4.1 Compressor Model
		4.2 Heat Exchangers Model
		4.3 Expansion Valves Model
	5 Verification of the Dynamic Model and Results for CO2-SO2 Mixtures Cycles
		5.1 Dynamic Model Verification in Design Conditions
		5.2 Off-Design Cycle Operation with Pure CO2 and CO2-SO2 Mixtures
	6 Conclusions and Future Works
	References
Preliminary Experiments in High Temperature Vapours of Organic Fluids in the Asymmetric Shock Tube for Experiments on Rarefaction Waves (ASTER)
	1 Introduction
	2 The ASTER Experimental Setup
		2.1 Choice of Working Fluid
		2.2 Facility Characterization
	3 Results
		3.1 Rarefaction Tests in D6
		3.2 Alternate Speed of Sound Measurements
	4 Conclusion and Future Work
	References
Experimental and Numerical Study of Transonic Flow of an Organic Vapor Past a Circular Cylinder
	1 Introduction
	2 Experimental Setup
	3 Numerical Method
	4 Results
	5 Conclusions
	References
Loss Measurement Strategy in ORC Supersonic Blade Cascades
	1 Introduction
	2 Conception of the Experiment
	3 Measurement Techniques
	4 Loss Measurement Method
	5 Conclusions and Future Works
	References
Mach Number Estimation and Pressure Profile Measurements of Expanding Dense Organic Vapors
	1 Introduction
	2 The Nozzle Test Section: Layout and Measurement Procedure
	3 Data Processing Method and Measurement Uncertainty
	4 Mach Number Estimation and Static Pressure Measurements
	5 Conclusions and Future Work
	References
Author Index