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Research paper thumbnail of Numerical treatment of turbulent reacting flows

Research paper thumbnail of Modeling and Simulations of High-Pressure Practical Flows

High-Pressure Flows for Propulsion Applications

International audienc

Research paper thumbnail of Large-eddy simulation of a scramjet combustor

HAL (Le Centre pour la Communication Scientifique Directe), 2019

International audienc

Research paper thumbnail of Analyse pour la LES d'une base de données de simulations directes

Dans ce papier, des simulations numériques directes d'un injecteur aéronautique à swirl sont anal... more Dans ce papier, des simulations numériques directes d'un injecteur aéronautique à swirl sont analysées avec pour objectif de concevoir de nouvelles fermetures pour les simulations aux grandes échelles. Ce brûleur à swirl a un nombre de Reynolds de 40 000 et un nombre de Reynolds turbulent de 1 400. Il est alimenté avec un prémélange pauvre d'air et de méthane à débit constant. La simulation numérique directe est réalisée avec un maillage de 2,6 milliards de tétraèdres et une résolution de 100 microns

Research paper thumbnail of Scalar fields sub-grid scale energy in Large-Eddy Simulation of turbulent flames: Mesh quality criterion

Research paper thumbnail of Introduction of detailed chemistry in LES. Validation process based on experimental results

Gordon Research Conference ’Laser Diagnostics in Combustion’, Aug 6, 2017

International audienc

Research paper thumbnail of Modelisation numerique de plasmas en ecoulement

Http Www Theses Fr, 1991

La modelisation des plasmas en ecoulement a grand nombre de Mach exige la prise en compte de phen... more La modelisation des plasmas en ecoulement a grand nombre de Mach exige la prise en compte de phenomenes physiques complexes et l'utilisation de methodes numeriques performantes et robustes. Deux methodes de resolution ont ete developpees. La premiere resoud les equations de Navier-Stokes pour un ecoulement en reactif en situation de couche limite, une methode de resolution proche de la methode de Patankar et Spalding est decrite. La deuxieme methode est applicable pour des ecoulements bidimensionnels (plans ou axisymetriques), l'approche est alors basee sur le schema numerique de MacCormack totalement implicite. La modelisation d'un plasma d'argon et d'un plasma d'azote est detaillee, en particulier les cinetiques chimiques et les termes d'echanges d'energies entre modes. Des comparaisons entre les resultats numeriques et des resultats experimentaux sont donnees

Research paper thumbnail of Effective normal strain rate and scalar gradient enhancement

Le Centre pour la Communication Scientifique Directe - HAL - memSIC, 2015

Research paper thumbnail of Flame stabilization in a cavity based scramjet

Research paper thumbnail of Toward Large Eddy Simulation of a Pulverized Coal Swirl Burner

Research paper thumbnail of Fully Compressible Large-Eddy Simulation of Wall-Jet Turbulent Mixing: Improved Boundary Conditions for Edge, Corner and Transverse Fluxes

Proceeding of Fifth International Symposium on Turbulence and Shear Flow Phenomena

Fully compressible Large-Eddy Simulation (LES) of high Reynolds impinging round-jet is performed ... more Fully compressible Large-Eddy Simulation (LES) of high Reynolds impinging round-jet is performed in order to assess the impact of both inlet profiles and boundary conditions on turbulence development. The modification to the Navier-Stokes Characteristic Boundary Conditions (NSCBC) proposed by Yoo et al. (2005) is extended to the 3D problem and a specific treatment for the computational domain edges and corners is proposed together with compatibility conditions for inlet/outlet and wall/outlet joining regions. Comparisons of the statistical results against the experimental data demonstrate the effectiveness of the proposed improvement, which allows for reproducing mean flow velocity up to the computational domain limits.

Research paper thumbnail of Turbulent Combustion in the Light of Direct and Large Eddy Simulation

Proceeding of Third Symposium on Turbulence and Shear Flow Phenomena

Research paper thumbnail of Simulating expanding flame kernels and turbulent jet flames with tabulated chemistry

Le Centre pour la Communication Scientifique Directe - HAL - Inria, 2012

International audienceno abstrac

Research paper thumbnail of A new approach to secure scalar boundedness in flame simulation with high-order spectral difference methods on unstructured meshes

Le Centre pour la Communication Scientifique Directe - HAL - Inria, Apr 19, 2015

International audienc

Research paper thumbnail of Machine learning for turbulent combustion modeling in high-fidelity LES

Le Centre pour la Communication Scientifique Directe - HAL - Université Paris Descartes, 2018

International audienc

Research paper thumbnail of Sub-grid scale modeling of the equation of state for fully compressible combustion LES

In large-eddy simulations (LES) of multicomponent and fully compressible flows, the pressure is f... more In large-eddy simulations (LES) of multicomponent and fully compressible flows, the pressure is formally obtained after filtering the equation of state. In practice, correlations between density, species and temperature are usually neglected to compute the filtered pressure from the resolved fields. Analyzing one-dimensional and three-dimensional H2/O2 space-filtered flames, we have found that a large part of the error introduced by the linearization of the equation of state can be counterbalanced by expressing the mean molar weight of the mixture with the Reynolds filtered species mass fractions, instead of the density-weighted mass fractions. An approximate deconvolution/filtering procedure is then discussed to estimate the Reynolds filtered mass fractions from the density-weighted mass fractions, which are the transported quantities in LES flow solvers.

Research paper thumbnail of From Discrete and Iterative Deconvolution Operators to Machine Learning for Premixed Turbulent Combustion Modeling

Data Analysis for Direct Numerical Simulations of Turbulent Combustion, 2020

Following the rapid and continuous progress of computing power allowing for increasing the mesh r... more Following the rapid and continuous progress of computing power allowing for increasing the mesh resolution in large eddy simulation (LES), new modeling strategies appear which are based on a direct treatment of the now well-resolved, but still not fully-resolved scalar signals. Along this line, deconvolution or inverse filtering, either based on discrete or iterative operators, is first discussed. Recent results obtained from a direct numerical simulation (DNS) database and LES of a premixed turbulent jet flame are presented. The analysis confirms the potential of deconvolution to approximate the unclosed non-linear terms and the SGS fluxes. Then, the introduction of machine learning in turbulent combustion modeling is illustrated in the context of convolutional neural networks.

Research paper thumbnail of Machine learning for sub-grid scale turbulent combustion modeling

Research paper thumbnail of Simulating kerosene / air flames with hybrid transported-tabulated chemistry

A strategy to introduce the detailed chemistry of kerosene combustion into direct numerical simul... more A strategy to introduce the detailed chemistry of kerosene combustion into direct numerical simulations of flames is reported. During the last decade, significant progress has been made to improve the chemical kinetic and turbulent combustion modeling as well as the high-performance computer power. However, a large-eddy simulation of an aeronautical combustion chamber using detailed chemistry mechanisms is still not possible because of the needed temporal resolution and the large number of species to be transported. The hybrid transported-tabulated chemistry method (HTTC) has been designed to overcome these obstacles and radically reduce the computational cost of such simulations, by transporting only a reduced set of major species and tabulating the intermediate species while making use of their selfsimilarity property to downsize the table. In this work, the application of HTTC to kerosene combustion is investigated. Although intermediate heavy species typical of kerosene combusti...

Research paper thumbnail of A WALE-Similarity Mixed Model for Large-Eddy Simulation of Wall Bounded Compressible Turbulent Flows

Direct and Large-Eddy Simulation VII, 2010

Wall-jet interaction is studied with Large Eddy Simulation (LES) in which a mixed similarity Sub-... more Wall-jet interaction is studied with Large Eddy Simulation (LES) in which a mixed similarity Sub-Grid Scale (SGS) closure is combined with the Wall-Adapting Local Eddy-viscosity (WALE) model for the eddy-viscosity term. Reduced macrotemperature and macropressure are introduced to deduce a weakly compressible form of the mixed similarity model and the relevant formulation for the energy equation is deduced accordingly. LES prediction capabilities are assessed by comparing flow statistical properties against experiment of an unconfined impinging round-jet at Reynolds number of 23,000 and 70,000.

Research paper thumbnail of Numerical treatment of turbulent reacting flows

Research paper thumbnail of Modeling and Simulations of High-Pressure Practical Flows

High-Pressure Flows for Propulsion Applications

International audienc

Research paper thumbnail of Large-eddy simulation of a scramjet combustor

HAL (Le Centre pour la Communication Scientifique Directe), 2019

International audienc

Research paper thumbnail of Analyse pour la LES d'une base de données de simulations directes

Dans ce papier, des simulations numériques directes d'un injecteur aéronautique à swirl sont anal... more Dans ce papier, des simulations numériques directes d'un injecteur aéronautique à swirl sont analysées avec pour objectif de concevoir de nouvelles fermetures pour les simulations aux grandes échelles. Ce brûleur à swirl a un nombre de Reynolds de 40 000 et un nombre de Reynolds turbulent de 1 400. Il est alimenté avec un prémélange pauvre d'air et de méthane à débit constant. La simulation numérique directe est réalisée avec un maillage de 2,6 milliards de tétraèdres et une résolution de 100 microns

Research paper thumbnail of Scalar fields sub-grid scale energy in Large-Eddy Simulation of turbulent flames: Mesh quality criterion

Research paper thumbnail of Introduction of detailed chemistry in LES. Validation process based on experimental results

Gordon Research Conference ’Laser Diagnostics in Combustion’, Aug 6, 2017

International audienc

Research paper thumbnail of Modelisation numerique de plasmas en ecoulement

Http Www Theses Fr, 1991

La modelisation des plasmas en ecoulement a grand nombre de Mach exige la prise en compte de phen... more La modelisation des plasmas en ecoulement a grand nombre de Mach exige la prise en compte de phenomenes physiques complexes et l'utilisation de methodes numeriques performantes et robustes. Deux methodes de resolution ont ete developpees. La premiere resoud les equations de Navier-Stokes pour un ecoulement en reactif en situation de couche limite, une methode de resolution proche de la methode de Patankar et Spalding est decrite. La deuxieme methode est applicable pour des ecoulements bidimensionnels (plans ou axisymetriques), l'approche est alors basee sur le schema numerique de MacCormack totalement implicite. La modelisation d'un plasma d'argon et d'un plasma d'azote est detaillee, en particulier les cinetiques chimiques et les termes d'echanges d'energies entre modes. Des comparaisons entre les resultats numeriques et des resultats experimentaux sont donnees

Research paper thumbnail of Effective normal strain rate and scalar gradient enhancement

Le Centre pour la Communication Scientifique Directe - HAL - memSIC, 2015

Research paper thumbnail of Flame stabilization in a cavity based scramjet

Research paper thumbnail of Toward Large Eddy Simulation of a Pulverized Coal Swirl Burner

Research paper thumbnail of Fully Compressible Large-Eddy Simulation of Wall-Jet Turbulent Mixing: Improved Boundary Conditions for Edge, Corner and Transverse Fluxes

Proceeding of Fifth International Symposium on Turbulence and Shear Flow Phenomena

Fully compressible Large-Eddy Simulation (LES) of high Reynolds impinging round-jet is performed ... more Fully compressible Large-Eddy Simulation (LES) of high Reynolds impinging round-jet is performed in order to assess the impact of both inlet profiles and boundary conditions on turbulence development. The modification to the Navier-Stokes Characteristic Boundary Conditions (NSCBC) proposed by Yoo et al. (2005) is extended to the 3D problem and a specific treatment for the computational domain edges and corners is proposed together with compatibility conditions for inlet/outlet and wall/outlet joining regions. Comparisons of the statistical results against the experimental data demonstrate the effectiveness of the proposed improvement, which allows for reproducing mean flow velocity up to the computational domain limits.

Research paper thumbnail of Turbulent Combustion in the Light of Direct and Large Eddy Simulation

Proceeding of Third Symposium on Turbulence and Shear Flow Phenomena

Research paper thumbnail of Simulating expanding flame kernels and turbulent jet flames with tabulated chemistry

Le Centre pour la Communication Scientifique Directe - HAL - Inria, 2012

International audienceno abstrac

Research paper thumbnail of A new approach to secure scalar boundedness in flame simulation with high-order spectral difference methods on unstructured meshes

Le Centre pour la Communication Scientifique Directe - HAL - Inria, Apr 19, 2015

International audienc

Research paper thumbnail of Machine learning for turbulent combustion modeling in high-fidelity LES

Le Centre pour la Communication Scientifique Directe - HAL - Université Paris Descartes, 2018

International audienc

Research paper thumbnail of Sub-grid scale modeling of the equation of state for fully compressible combustion LES

In large-eddy simulations (LES) of multicomponent and fully compressible flows, the pressure is f... more In large-eddy simulations (LES) of multicomponent and fully compressible flows, the pressure is formally obtained after filtering the equation of state. In practice, correlations between density, species and temperature are usually neglected to compute the filtered pressure from the resolved fields. Analyzing one-dimensional and three-dimensional H2/O2 space-filtered flames, we have found that a large part of the error introduced by the linearization of the equation of state can be counterbalanced by expressing the mean molar weight of the mixture with the Reynolds filtered species mass fractions, instead of the density-weighted mass fractions. An approximate deconvolution/filtering procedure is then discussed to estimate the Reynolds filtered mass fractions from the density-weighted mass fractions, which are the transported quantities in LES flow solvers.

Research paper thumbnail of From Discrete and Iterative Deconvolution Operators to Machine Learning for Premixed Turbulent Combustion Modeling

Data Analysis for Direct Numerical Simulations of Turbulent Combustion, 2020

Following the rapid and continuous progress of computing power allowing for increasing the mesh r... more Following the rapid and continuous progress of computing power allowing for increasing the mesh resolution in large eddy simulation (LES), new modeling strategies appear which are based on a direct treatment of the now well-resolved, but still not fully-resolved scalar signals. Along this line, deconvolution or inverse filtering, either based on discrete or iterative operators, is first discussed. Recent results obtained from a direct numerical simulation (DNS) database and LES of a premixed turbulent jet flame are presented. The analysis confirms the potential of deconvolution to approximate the unclosed non-linear terms and the SGS fluxes. Then, the introduction of machine learning in turbulent combustion modeling is illustrated in the context of convolutional neural networks.

Research paper thumbnail of Machine learning for sub-grid scale turbulent combustion modeling

Research paper thumbnail of Simulating kerosene / air flames with hybrid transported-tabulated chemistry

A strategy to introduce the detailed chemistry of kerosene combustion into direct numerical simul... more A strategy to introduce the detailed chemistry of kerosene combustion into direct numerical simulations of flames is reported. During the last decade, significant progress has been made to improve the chemical kinetic and turbulent combustion modeling as well as the high-performance computer power. However, a large-eddy simulation of an aeronautical combustion chamber using detailed chemistry mechanisms is still not possible because of the needed temporal resolution and the large number of species to be transported. The hybrid transported-tabulated chemistry method (HTTC) has been designed to overcome these obstacles and radically reduce the computational cost of such simulations, by transporting only a reduced set of major species and tabulating the intermediate species while making use of their selfsimilarity property to downsize the table. In this work, the application of HTTC to kerosene combustion is investigated. Although intermediate heavy species typical of kerosene combusti...

Research paper thumbnail of A WALE-Similarity Mixed Model for Large-Eddy Simulation of Wall Bounded Compressible Turbulent Flows

Direct and Large-Eddy Simulation VII, 2010

Wall-jet interaction is studied with Large Eddy Simulation (LES) in which a mixed similarity Sub-... more Wall-jet interaction is studied with Large Eddy Simulation (LES) in which a mixed similarity Sub-Grid Scale (SGS) closure is combined with the Wall-Adapting Local Eddy-viscosity (WALE) model for the eddy-viscosity term. Reduced macrotemperature and macropressure are introduced to deduce a weakly compressible form of the mixed similarity model and the relevant formulation for the energy equation is deduced accordingly. LES prediction capabilities are assessed by comparing flow statistical properties against experiment of an unconfined impinging round-jet at Reynolds number of 23,000 and 70,000.