RANS modelling of a lifted hydrogen flame using eulerian/lagrangian approaches with transported PDF method

Larbi, Ahmed Amine; Bounif, Abdelhamid; Senouci, M.; Gökalp, İskender; Bouzit, Mohamed

doi:10.1016/j.energy.2018.08.073

Cited by 9 publications

(3 citation statements)

References 41 publications

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“…Detailed modelling of the various terms of Eqs. ( 5) and ( 6) is detailed in our previous work [3,14]. The turbulent flux of the scalar is modelled as:…”

Section: Modelling the Turbulencementioning

confidence: 99%

A numerical investigation of effects of chemical kinetic mechanisms on the structure of turbulent jet diffusion H2/air flame with Lagrangian PDF method

Senouci Mohammed,

BOUNIF,

MEROUANE

et al. 2023

JMES

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Many physical phenomena characteristic of reactive flows are controlled by the detail of the chemical kinetics of combustion. These include, for example, the ignition and extinction of a flame and the formation of polluting species. These phenomena require the use of detailed kinetic schemes including hundreds of species and thousands of reactions.The main objective of this work is to highlight the influence of chemical kinetics on the structure of turbulent jet diffusion H2/air flame. Five improved hydrogen kinetic mechanisms have been tested in order to validate, compare and evaluate their effect on the scalar and dynamic fields of such flames. The effect of number particles used in Lagrangian PDF method on the temperature evoltution is also studied. A hybrid method, PDF Lagrangian coupled to the RSM turbulence model, is used in this work, for the numerical simulation. The micro-mixing term of the TPDF is modeled by the EMST model. This model, which describes well the physical process of mixing, has shown its capabilities to give good numerical results. The impact of these mechanisms on the numerical results of scalar and dynamic fields was discussed and compared with the experimental data. The scalar field is well influenced by the choice of the chemical kinetic mechanism. This is not the case of the dynamic field. A good agreement with experience is observed for detailed kinetic mechanisms. However, it has been noticed that simple and reduced mechanisms give also satisfactory results, particularly the reduced kinetic mechanism R12 wich includes 12 reaction and can be considered as a compromise among the five kinetic mechanisms. These mechanisms allows for a significant reduction in CPU time and storage memory. It was also observed that, for the two chemical kinetic mechanisms R12 and R27, the number of particles only affects the radial evolution.

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“…Detailed modelling of the various terms of Eqs. ( 5) and ( 6) is detailed in our previous work [3,14]. The turbulent flux of the scalar is modelled as:…”

Section: Modelling the Turbulencementioning

confidence: 99%

A numerical investigation of effects of chemical kinetic mechanisms on the structure of turbulent jet diffusion H2/air flame with Lagrangian PDF method

Senouci Mohammed,

BOUNIF,

MEROUANE

et al. 2023

JMES

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“…The primary strength of the assumed PDF approach lies in its capability to fully account for the highly nonlinear reaction term, eliminating the need for additional modeling [8][9][10]. The micromixing term remains the only significant element to be modeled.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Modified EMST Micromixing Model Performance on Lagrangian PDF Transported in Lifted Hydrogen/Air Fames

Mohamed Senouci,

Ahmed Amine Larbi,

Habib Rouan Serik

et al. 2024

CFDL

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This article presents a numerical simulation of high hydrogen/air flames using the Lagrangian transported PDF method. This method enables the calculation of fluid composition changes resulting from convection and reaction without the need for modelling, while requiring modelling for molecular mixing. Consequently, the accuracy of calculations in this L-PDF method heavily relies on an accurate representation of the mixture model term. The Euclidean model, which provides a better description of physical mixing processes, is well-suited for modelling the molecular mixing term EMST. Additionally, the accuracy of this model depends on the value of the mixing constant, representing the ratio between the mechanical time scale and the scalar time scale. Two algebraic models for the mixing constant have been implemented in the computational code, employing a well-defined function to calculate this ratio for each cell. These models contribute to memory and CPU time savings. To account for turbulence and its interaction with physical phenomena, the RSM model is employed due to its ability to identify different areas of turbulent stresses. Hence, the primary objective of this study is to evaluate the capabilities of these algebraic models in predicting scalar fields within such flames. Overall, the predictions align well with experimental data, affirming the validity of these models.

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“…They apply their simulations to a column reactor at gas bubbles widely used in industry to highlight the implications of the simplification assumptions made in these turbulence models. Convective heat transfer and hydrodynamic characteristics of nano-fluids were studied by Larbi et al [13] using ANSYS-FLUENT. They compared different turbulence models.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Reactive Flow of Two Turbulence Models Based on Probability Density Function

Habib¹,

Bounif²,

Bouzit³

et al. 2019

I2M

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This paper mainly numerically simulates the reactive flow of a hydrogen flame diluted with nitrogen. The behavior of this flame was simulated by two turbulence models: the standard kepsilon (k-ε) model and the Reynolds stress model (RSM). The combustion process was modelled by the probability density function (PDF), in association with the flamlete regime. For comparison, the authors measured the reactive flow of the said flame in a simple configuration under the simulation conditions. The measured results agree well with the simulation results: the RSM consistently outputted better results than the k-ε model in all flame zones. The research results are of great significance to the numerical visualization of turbulent gas flows.

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RANS modelling of a lifted hydrogen flame using eulerian/lagrangian approaches with transported PDF method

Cited by 9 publications

References 41 publications

A numerical investigation of effects of chemical kinetic mechanisms on the structure of turbulent jet diffusion H2/air flame with Lagrangian PDF method

A numerical investigation of effects of chemical kinetic mechanisms on the structure of turbulent jet diffusion H2/air flame with Lagrangian PDF method

Investigation of Modified EMST Micromixing Model Performance on Lagrangian PDF Transported in Lifted Hydrogen/Air Fames

Numerical Simulation of Reactive Flow of Two Turbulence Models Based on Probability Density Function

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