Large-eddy simulations (LESs) of cryogenic nitrogen injection into a warm environment at supercritical pressure are performed and real-gas thermodynamics models subgrid-scale (SGS) turbulence evaluated. The comparison different SGS — the Smagorinsky model, Vreman adaptive local deconvolution method shows that representation on resolved scales has notable effect location jet break-up, whereas particular modeling unresolved is less important for overall mean flow field evolution. More fluid’s...

Abstract A quasi-DNS of the partially premixed turbulent Sydney flame in configuration FJ200-5GP-Lr75-57 has been conducted using detailed molecular diffusion for multi-component mixtures and complex reaction mechanisms. In order to study dynamics like regime transition this development new combustion models directly compare different LES models, simulation results are compiled into a data base. Because was performed with OpenFOAM, we demonstrate capabilities OpenFOAM by performing canonical...

Summary This paper describes the implementation of a numerical solver that is capable simulating compressible flows nonideal single‐phase fluids. The proposed method can be applied to arbitrary equations state and suitable for all Mach numbers. pressure‐based uses operator‐splitting technique based on PISO/SIMPLE algorithm: density, velocity, temperature fields are predicted by solving linearized versions balance using convective fluxes from previous iteration or time step. overall mass...

Vapor–liquid equilibria and fluid interface properties of binary mixtures containing either methane or cyclohexane representing fuel nitrogen oxygen are reported. The studied at different temperatures pressures, which chosen such that the temperature component is subcritical, while gaseous mainly supercritical. Data obtained from molecular dynamics (MD) simulation, as well density functional theory gradient in combination with PC-SAFT equation state (EOS). include surface tension, thickness,...

In this numerical study an optimized trench film cooling design is determined using a Bayesian algorithm and neural network trained RANS model. Three objective functions were considered, the area-averaged efficiency, spatial standard deviation of efficiency hot gas ingestion into trench. Nine geometrical parameters varied to allow for 3D shape find optimal based on initial parametrization Jet-engine like inflow boundary conditions with respect turbulence intensity length scales applied. The...

The Fermi-liquid interaction and the quasiparticle scattering amplitude on Fermi surface for liquid $^{3}\mathrm{He}$ are calculated by solving pair of coupled Bethe-Salpeter equations in two particle-hole channels. method solution preserves exchange symmetry employing eigenfunctions operator as a basis set. effective mass totally irreducible direct needed an input taken from available microscopic calculations. It is found that small nonlocal part necessary order to obtain large backflow...

Large-eddy simulations are carried out for the coaxial injection of liquid nitrogen and preheated hydrogen at supercritical pressures. The conditions similar to that in typical liquid-propellant rocket combustors. By using as a model gas, mixing process is studied without interference with chemical reactions. An analysis thermodynamic arise shear layer reveals local phase separation may occur if condition transcritical. A novel volume-translation method on basis cubic Peng–Robinson equation...

To design more efficient film cooling geometries for gas turbines, non-intrusive measurements of the flow temperature, velocity and derived quantities like turbulent heat flux are needed in well-defined, generic configurations. With this aim we have applied thermographic particle image velocimetry (thermographic PIV) to investigate emanating from angled trenched holes a closed-loop optically-accessible wind tunnel facility. BAM:Eu2+ phosphor particles were seeded into as tracer. A pulsed...

Abstract Identifying combustion regimes in terms of premixed and non-premixed characteristics is an important task for understanding phenomena the structure flames. A quasi-DNS database compositionally inhomogeneous partially Sydney/Sandia flame configuration FJ-5GP-Lr75-57 used to directly compare different types regime markers from literature. In simulation flame, detailed chemistry diffusion models are utilized no turbulence as front flow fully resolved near nozzle. This allows evaluating...

to develop a validated and reliable numerical tool for the simulation of whole rocket combustion chamber, real gas thermodynamics has been implemented into CFD code OpenFOAM. The work presented here shows details implementation pressure based solution approach validation developed solver. Finally new LES solver used transcritical injection nitrogen where CFD-code reproduced experimental data very well. A future task will be further by means multicomponent mixing simulations.

Under rocket-relevant conditions, real-gas effects and thermodynamic nonidealities are prominent features of the flow field. Experimental investigations indicate that phase separation can occur, depending on operating conditions involved species in multicomponent flow. During past decades, several research groups rocket combustion community have addressed this topic. In contribution, a high-fidelity framework comprising phase-separation is employed to investigate liquid-oxygen/methane...

In this work, a deep neural network is presented which trained on flamelet/progress variable (FPV) tables and validated in combustion large eddy simulation (LES) of the Sydney/Sandia flame with inhomogeneous inlets. Using data scaling transformation techniques, as well novel architectures residual skip connection we are able to store all relevant quantities one single network, thus reducing effectively memory footprint compared FPV tables, while keeping retrieval times similar table...

It is shown that the Fermi-liquid interaction and quasiparticle scattering amplitude for an almost-localized Fermi system tend to a universal limit characterized by large values of Landau parameters ${F}_{0}^{s}$ ${F}_{1}^{s}$ small ${F}_{0}^{a}$, ${F}_{1}^{a}$, higher-l components. The argument based on coupled integral equations two-particle vertex function in particle-hole particle-particle channels. Our results are close agreement with those obtained earlier from Gutzwiller's solution...

A comparison of the numerical predictions several groups modeling reacting flow inside a gaseous methane/gaseous oxygen single-element rocket combustion chamber is conducted. The focus placed on turbulence quantities and their influence computed mean fields. However, subject this paper not pure study model variation, but it aims at showing its effect within framework different overall setups. These comprise differences in models as well codes used. Several Reynolds-averaged Navier–Stokes...