Numerical Investigations of Phase-Separation During Multi-Component Mixing at Super-Critical Conditions

Exploring the interaction between phase separation and turbulent fluid dynamics in multi-species supercritical jets using a tabulated real-fluid model

“…However, the same is not valid for multicomponent systems for which the local critical pressure of the mixture could dramatically exceed the value of the pure components. Indeed, various studies have been carried out for multicomponent systems, and their interfacial phase transition has been revealed to be more complex than for a single-component system, mainly due to the variation of the mixture critical point with the local composition of the fluid [8,17,[19][20][21][22][23][24][25]. Furthermore, this difference in phase transition mechanisms between single and multicomponent systems leads to various interface structures that influence the jet behavior [1,8,21,22].…”

Rapid multi‐component phase‐split calculations using volume functions and reduction methods

“…In Computational Fluid Dynamics (CFD) simulations of realistic multi-component vapor-liquid fluid flows, millions of phase equilibrium calculations are required every time step in the form of either the VT-flash or UV-flash, depending on the chosen formulation of the governing equations: The VT-flash is needed in cases where the overall specific volume, temperature and composition are known, such as for the carbon dioxide injection into subsurface reservoirs. 1,2 Methods that solve the compressible Navier-Stokes equations based on the conservation laws for mass, linear momentum and total energy, such as applied for the simulation of the trans-critical vaporization of liquid fuels, [3][4][5][6] require a UV-flash, where the input is the overall specific internal energy, volume, and composition. The calculation of thermodynamic equilibrium properties of multi-component multi-phase mixtures typically consumes more than three quarters of the total computational time 7,8 and thus imposes severe limitation on the tractable space-time resolution or even the computational feasibility of such numerical simulations.…”

Shock wave interaction with a transcritical fuel droplet

“…There are many reports on simulation of droplet/shock interactions using sharp-interface and diffuse-interface approaches at subcritical conditions [39][40][41][42][43][44]. However, there are only two reports that simulate the fuel droplet-shock interaction at transcritical conditions [45,46]. To the authors' knowledge, the underlying physics behind this problem have not been previously investigated.…”