Calculating thermal radiation of a vibrational nonequilibrium gas flow using the method of k-distribution

Молчанов, А. М.; Bykov, L. V.; Yanyshev, D. S.

doi:10.1134/s086986431703009x

Cited by 6 publications

(5 citation statements)

References 13 publications

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“…e.g. [1]) and to the number of cells (nodes) in the grid. Modern simulations of high-enthalpy flows deal with grids containing from several thousand to dozens of million cells (nodes).…”

Section: Introductionmentioning

confidence: 99%

Utilization of parallel computing for mathematical modeling of high-enthalpy flows

Gribinenko¹,

Молчанов²,

Siluyanova³

et al. 2022

J. Phys.: Conf. Ser.

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The complexity of problems in gas dynamics is increasing from year to year, which makes sequential computational codes more and more inadequate and brings the importance of creating their parallel implementations. The problem of building the parallel implementations is not simple, especially in case of parallelization of the existing sequential codes. In this paper we present a method of simulation of high-enthalpy flows and describe the peculiarities of its parallel implementation utilizing PETSc library, which gives a wide variety of tools to simplify creation of parallel codes. The results for calculation of OREX reentry module as well as analysis of scalability of the parallel code implementation are given.

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“…e.g. [1]) and to the number of cells (nodes) in the grid. Modern simulations of high-enthalpy flows deal with grids containing from several thousand to dozens of million cells (nodes).…”

Section: Introductionmentioning

confidence: 99%

Utilization of parallel computing for mathematical modeling of high-enthalpy flows

Gribinenko¹,

Молчанов²,

Siluyanova³

et al. 2022

J. Phys.: Conf. Ser.

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“…Leccesse et al [21] also studied these fuel pairs and found that the contribution of the RHF was up to 15% for the described cases. Some other studies have referred to general RHF evaluation in turbulent combustion tests [22][23][24][25] and showed significant influences that should be accounted for.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the GOx/GCH4 Multi-Element Combustor Including the Effects of Radiation and Algebraic Variable Turbulent Prandtl Approaches

2020

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Multi-element thrusters operating with gaseous oxygen (GOX) and methane (GCH4) have been numerically studied and the results were compared to test data from the Technical University of Munich (TUM). A 3D Reynolds Averaged Navier–Stokes Equations (RANS) approach using a 60° sector as a simulation domain was used for the studies. The primary goals were to examine the effect of the turbulent Prandtl number approximations including local algebraic approaches and to study the influence of radiative heat transfer (RHT). Additionally, the dependence of the results on turbulence modeling was studied. Finally, an adiabatic flamelet approach was compared to an Eddy-Dissipation approach by applying an enhanced global reaction scheme. The normalized and absolute pressures, the integral and segment averaged heat flux were taken as an experimental reference. The results of the different modeling approaches were discussed, and the best performing models were chosen. It was found that compared to other discussed approaches, the BaseLine Explicit Algebraic Reynolds Stress Model (BSL EARSM) provided more physical behavior in terms of mixing, and the adiabatic flamelet was more relevant for combustion. The effect of thermal radiation on the wall heat flux (WHF) was high and was strongly affected by spectral models and wall thermal emissivity. The obtained results showed good agreement with the experimental data, having a small underestimation for pressures of around 2.9% and a good representation of the integral wall heat flux.

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“…Numerical codes, therefore, should be validated for this criteria and the most suitable approaches of physical phenomena modeling should be chosen. 1–5 For the several past years, at the Chair of Turbomachinery and Flight Propulsion (LTF) at the Technical University of Munich a lot of experimental rocket propulsion framework studies have been carried out.…”

Section: Introductionmentioning

confidence: 99%

“…Numerical codes, therefore, should be validated for this criteria and the most suitable approaches of physical phenomena modeling should be chosen. [1][2][3][4][5] For the several past years, at the Chair of Turbomachinery and Flight Propulsion (LTF) at the Technical University of Munich a lot of experimental rocket propulsion framework studies have been carried out. Among these, a GCH4/GOx multi-element injector test case was chosen to validate the numerical calculations, as it is both well-described and suitable for numerical verification settings.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of reacting flow in the combustion chamber and study of the impact of turbulent diffusion coefficients

Strokach

Borovik

Chen

2020

Advances in Mechanical Engineering

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A methodology for combustion modeling with complex mixing and thermodynamic conditions, especially in thrusters, is still under development. The resulting flow and propulsion parameters strongly depend on the models used, especially on the turbulence model as it determines the mixing efficiency. In this paper, the effect of the sigma-type turbulent diffusion coefficients arriving in the diffusion term of the turbulence model is studied. This study was performed using complex modeling, considering the conjugate effect of several physical phenomena such as turbulence, chemical reactions, and radiation heat transfer. To consider the varying turbulent Prandtl, an algebraic model was implemented. An adiabatic steady diffusion Flamelet approach was used to model chemical reactions. The P1 differential model with a WSGG spectral model was used for radiation heat transfer. The gaseous oxygen (GOX) and methane (GCH4) operating thruster developed at the Chair of turbomachinery and Flight propulsion of the Technical University of Munich (TUM) is taken as a test case. The studies use the 3D RANS approach using the 60° sector as the modeling domain. The normalized and absolute pressures, the integral and segment averaged heat flux are compared to numerical results. The wall heat fluxes and pressure distributions show good agreement with the experimental data, while the turbulent diffusion coefficients mostly influence the heat flux.

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Calculating thermal radiation of a vibrational nonequilibrium gas flow using the method of k-distribution

Cited by 6 publications

References 13 publications

Utilization of parallel computing for mathematical modeling of high-enthalpy flows

Utilization of parallel computing for mathematical modeling of high-enthalpy flows

Simulation of the GOx/GCH4 Multi-Element Combustor Including the Effects of Radiation and Algebraic Variable Turbulent Prandtl Approaches

Numerical simulation of reacting flow in the combustion chamber and study of the impact of turbulent diffusion coefficients

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