Daniel Huilier | Université de Strasbourg (original) (raw)
Papers by Daniel Huilier
Engineering Turbulence Modelling and Experiments, 1996
The purpose of the present communication is to summarize the state-of-the art knowledge of the ex... more The purpose of the present communication is to summarize the state-of-the art knowledge of the existing relationships between Eulerian and Lagrangian statistics in the literature. It will focus on integral scales, especially the classical Eulerian scales (such as those classically obtained from a fixed hot-wire or LDA control volume), the interesting moving Eulerian time scale (that obtained by a sensor which would move with the mean velocity) and the Lagrangian integral scale, most important for Lagrangian turbulent diffusion and dispersion simulations.Copyright © 2002 by ASME
Turbulent dispersion is generally studied in flows such as free jets or grid turbulence. We propo... more Turbulent dispersion is generally studied in flows such as free jets or grid turbulence. We propose here a more complex flow resulting from a constant shear turbulence generated by an appropriate grid to which is superimposed the jet of the air-blast injector that generates the aerosol
Simulation of Gas-Particle flows can be fulfilled by Lagrangian modeling of the dispersed phase. ... more Simulation of Gas-Particle flows can be fulfilled by Lagrangian modeling of the dispersed phase. Each type of Lagrangian method, Monte-Carlo/Eddy Interaction or Markov Chain models, needs the knowledge of Lagrangian scales associated with the turbulent flow under consideration and the type of particle dispersing in the gas carrier flow. Unfortunately, Lagrangian quantities (as well the interesting moving Eulerian time scale, that given by a sensor which would move with the mean fluid velocity) are still difficult to be obtained directly by most experimental measurement techniques (except by very recent techniques such as PIV.PTV.), contrary to Eulerian scales scales, such as those classically obtained from a fixed hot-wire or LDA control volume. It is therefore of great importance to have available accurate relationships between Eulerian and Lagrangian scales, based on fluid flow properties as well as particle characteristics.Copyright © 2003 by ASME
Fluids Engineering
A Lagrangian approach is developed to describe particle’s dispersion in a stationary, homogeneous... more A Lagrangian approach is developed to describe particle’s dispersion in a stationary, homogeneous and isotropic turbulent flow. Obviously, the particles’ dispersion is influenced by the fluid velocity fluctuations, which are classically simulated by a Monte Carlo process or Markov chains. However, some studies have shown the restrictions of these methods generating the fluid turbulent velocity and have suggested improvements to ensure that the Lagrangian model accounts for the three main effects governing the dispersion in gas-particle flows, namely the inertia, crossing trajectories and continuity effects. The first aim of this paper is to present an improved Lagrangian model which integrates the spatio-temporal characteristics of the fluid turbulence experienced by the particle. The agreement between the numerical results obtained and the analytical expressions derived by Wang and Stock (1993) will be very satisfying. Another interest is to investigate the role of the traditionall...
Fluids
Particle tracking is a competitive technique widely used in two-phase flows and best suited to si... more Particle tracking is a competitive technique widely used in two-phase flows and best suited to simulate the dispersion of heavy particles in the atmosphere. Most Lagrangian models in the statistical approach to turbulence are based either on the eddy interaction model (EIM) and the Monte-Carlo method or on random walk models (RWMs) making use of Markov chains and a Langevin equation. In the present work, both discontinuous and continuous random walk techniques are used to model the dispersion of heavy spherical particles in homogeneous isotropic stationary turbulence (HIST). Their efficiency to predict particle long time dispersion, mean-square velocity and Lagrangian integral time scales are discussed. Computation results with zero and no-zero mean drift velocity are reported; they are intended to quantify the inertia, gravity, crossing-trajectory and continuity effects controlling the dispersion. The calculations concern dense monodisperse spheres in air, the particle Stokes numbe...
Fluids
A summary of the personal investment in teaching fluid mechanics over 40 years in a French univer... more A summary of the personal investment in teaching fluid mechanics over 40 years in a French university is presented. Learning and Teaching Science and Engineering has never been easy, and in recent years it has become a crucial challenge for curriculum developers and teaching staff to offer attractive courses and optimized assessments. One objective is to ensure that students acquire competitive skills in higher science education that enable them to compete in the employment market, as the mechanical field is a privileged sector in industry. During the last decade, classical learning and teaching methods have been coupled with hands-on practice for future schoolteachers in a specific course on subjects including fluid mechanics. The hands-on/minds-on/hearts-on approach has demonstrated its effectiveness in training primary school teachers, and fluids are certainly a nice source of motivation for pupils in science learning. In mechanical engineering, for undergraduate and graduate stu...
L'enseignement de la physique et plus spécifiquement de la mécanique revêt d'aspects divers et hé... more L'enseignement de la physique et plus spécifiquement de la mécanique revêt d'aspects divers et hétérogènes. A priori précis, dicté, guidé en master ou L3, L2 classique car les programmes sont relativement rigides et codifiés, l'enseignement permet cependant des latitudes en ex-IUFM et d'autres secteurs tel que l'enseignement en milieu scolaire. L'auteur s'y est attaché, en grande partie en raison de ses expériences de longue date d'enseignement du tennis en milieu scolaire, en école de tennis et tennis de compétition, qui l'ont motivé à accepter et tenter cette expérience nouvelle. Sa recherche pédagogique relève plus spécifiquement d'une démarche type 'Main à la pâte' en IUFM niveau L3 lors de séances de travaux pratiques très libres liées à la chute libre, à la notion de poussée d'Archimède, de traînée due à la viscosité. Elle est comparée aux expériences nombreuses de l'enseignement complet (cours, travaux dirigés et pratiques) en mécanique des fluides.
The purpose of the present communication is to summarize the state-of-the art knowledge of the ex... more The purpose of the present communication is to summarize the state-of-the art knowledge of the existing relationships between Eulerian and Lagrangian statistics in the literature. It will focus on integral scales, especially the classical Eulerian scales (such as those classically obtained from a fixed hot-wire or LDA control volume), the interesting moving Eulerian time scale (that obtained by a sensor which would move with the mean velocity) and the Lagrangian integral scale, most important for Lagrangian turbulent diffusion and dispersion simulations.Copyright © 2002 by ASME
Comptes Rendus de l Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy
Lagrangian-Lagrangian modelling enables a better understanding of the turbulent dispersion of hea... more Lagrangian-Lagrangian modelling enables a better understanding of the turbulent dispersion of heavy particles in turbulent flows. A new model is proposed here in order to simulate the turbulent shear and vorticity of the carrier fluid which interact, and to modify the trajectories of inertial particles. The model is then applied to the predictions of dispersion of spherical particles in a grid turbulence.
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy, 1998
The aim of this paper is to present modifications brought to a standard Lagrangian model for turb... more The aim of this paper is to present modifications brought to a standard Lagrangian model for turbulent dispersion so that the forces acting on a heavy particle in a turbulent boundary layer can be taken into account. A satisfying validation of this modified model for Lagrangian trajectography is then obtained and compared with the experimental results of Tanière et al.
Mechanics Research Communications, 1995
Atomization and Sprays, 1996
Engineering Turbulence Modelling and Experiments, 1996
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy, 1997
The aim of this paper is to modify a basic Lagrangian model for turbulent dispersion so that the ... more The aim of this paper is to modify a basic Lagrangian model for turbulent dispersion so that the real turbulence seen by a heavy particle on its path can be taken into account. A satisfactory validation of this modified model is then done with the analytical relations of Wang and Stock (1993) in the case of homogeneous isotropic turbulence, without
Mechanics research …, 1998
Experimental Thermal and Fluid Science, 1998
The aim of this paper is to study experimentally the turbulent structure of an axisymmetric jet s... more The aim of this paper is to study experimentally the turbulent structure of an axisymmetric jet submerged in the co-¯owing stream of the test section of a wind tunnel. The experiments have been performed without and with three dierent velocities for the outer stream. The measurements were carried out by using Pitot tube and Stationary Hot-Wires. The in¯uence of the outer stream and the con®nement eect on the development of the turbulent jet are analyzed. It is shown that the streamwise variation of the excess mean velocity, the jet expansion and the spanwise distribution of the longitudinal normal Reynolds stress are close to that observed on free jets by other research groups. Self-similarity is also investigated. An extensive spectral analysis has also been done, and the centerline variations of the integral time scales and Taylor microscales are also presented. Only the third-order moment of the longitudinal velocity¯uctuation exhibits a radial distribution very dierent from that expected in free jets. In the case of no outer stream, it is shown that the con®nement eects dominate and modify signi®cantly the jet structure.
Engineering Turbulence Modelling and Experiments, 1996
The purpose of the present communication is to summarize the state-of-the art knowledge of the ex... more The purpose of the present communication is to summarize the state-of-the art knowledge of the existing relationships between Eulerian and Lagrangian statistics in the literature. It will focus on integral scales, especially the classical Eulerian scales (such as those classically obtained from a fixed hot-wire or LDA control volume), the interesting moving Eulerian time scale (that obtained by a sensor which would move with the mean velocity) and the Lagrangian integral scale, most important for Lagrangian turbulent diffusion and dispersion simulations.Copyright © 2002 by ASME
Turbulent dispersion is generally studied in flows such as free jets or grid turbulence. We propo... more Turbulent dispersion is generally studied in flows such as free jets or grid turbulence. We propose here a more complex flow resulting from a constant shear turbulence generated by an appropriate grid to which is superimposed the jet of the air-blast injector that generates the aerosol
Simulation of Gas-Particle flows can be fulfilled by Lagrangian modeling of the dispersed phase. ... more Simulation of Gas-Particle flows can be fulfilled by Lagrangian modeling of the dispersed phase. Each type of Lagrangian method, Monte-Carlo/Eddy Interaction or Markov Chain models, needs the knowledge of Lagrangian scales associated with the turbulent flow under consideration and the type of particle dispersing in the gas carrier flow. Unfortunately, Lagrangian quantities (as well the interesting moving Eulerian time scale, that given by a sensor which would move with the mean fluid velocity) are still difficult to be obtained directly by most experimental measurement techniques (except by very recent techniques such as PIV.PTV.), contrary to Eulerian scales scales, such as those classically obtained from a fixed hot-wire or LDA control volume. It is therefore of great importance to have available accurate relationships between Eulerian and Lagrangian scales, based on fluid flow properties as well as particle characteristics.Copyright © 2003 by ASME
Fluids Engineering
A Lagrangian approach is developed to describe particle’s dispersion in a stationary, homogeneous... more A Lagrangian approach is developed to describe particle’s dispersion in a stationary, homogeneous and isotropic turbulent flow. Obviously, the particles’ dispersion is influenced by the fluid velocity fluctuations, which are classically simulated by a Monte Carlo process or Markov chains. However, some studies have shown the restrictions of these methods generating the fluid turbulent velocity and have suggested improvements to ensure that the Lagrangian model accounts for the three main effects governing the dispersion in gas-particle flows, namely the inertia, crossing trajectories and continuity effects. The first aim of this paper is to present an improved Lagrangian model which integrates the spatio-temporal characteristics of the fluid turbulence experienced by the particle. The agreement between the numerical results obtained and the analytical expressions derived by Wang and Stock (1993) will be very satisfying. Another interest is to investigate the role of the traditionall...
Fluids
Particle tracking is a competitive technique widely used in two-phase flows and best suited to si... more Particle tracking is a competitive technique widely used in two-phase flows and best suited to simulate the dispersion of heavy particles in the atmosphere. Most Lagrangian models in the statistical approach to turbulence are based either on the eddy interaction model (EIM) and the Monte-Carlo method or on random walk models (RWMs) making use of Markov chains and a Langevin equation. In the present work, both discontinuous and continuous random walk techniques are used to model the dispersion of heavy spherical particles in homogeneous isotropic stationary turbulence (HIST). Their efficiency to predict particle long time dispersion, mean-square velocity and Lagrangian integral time scales are discussed. Computation results with zero and no-zero mean drift velocity are reported; they are intended to quantify the inertia, gravity, crossing-trajectory and continuity effects controlling the dispersion. The calculations concern dense monodisperse spheres in air, the particle Stokes numbe...
Fluids
A summary of the personal investment in teaching fluid mechanics over 40 years in a French univer... more A summary of the personal investment in teaching fluid mechanics over 40 years in a French university is presented. Learning and Teaching Science and Engineering has never been easy, and in recent years it has become a crucial challenge for curriculum developers and teaching staff to offer attractive courses and optimized assessments. One objective is to ensure that students acquire competitive skills in higher science education that enable them to compete in the employment market, as the mechanical field is a privileged sector in industry. During the last decade, classical learning and teaching methods have been coupled with hands-on practice for future schoolteachers in a specific course on subjects including fluid mechanics. The hands-on/minds-on/hearts-on approach has demonstrated its effectiveness in training primary school teachers, and fluids are certainly a nice source of motivation for pupils in science learning. In mechanical engineering, for undergraduate and graduate stu...
L'enseignement de la physique et plus spécifiquement de la mécanique revêt d'aspects divers et hé... more L'enseignement de la physique et plus spécifiquement de la mécanique revêt d'aspects divers et hétérogènes. A priori précis, dicté, guidé en master ou L3, L2 classique car les programmes sont relativement rigides et codifiés, l'enseignement permet cependant des latitudes en ex-IUFM et d'autres secteurs tel que l'enseignement en milieu scolaire. L'auteur s'y est attaché, en grande partie en raison de ses expériences de longue date d'enseignement du tennis en milieu scolaire, en école de tennis et tennis de compétition, qui l'ont motivé à accepter et tenter cette expérience nouvelle. Sa recherche pédagogique relève plus spécifiquement d'une démarche type 'Main à la pâte' en IUFM niveau L3 lors de séances de travaux pratiques très libres liées à la chute libre, à la notion de poussée d'Archimède, de traînée due à la viscosité. Elle est comparée aux expériences nombreuses de l'enseignement complet (cours, travaux dirigés et pratiques) en mécanique des fluides.
The purpose of the present communication is to summarize the state-of-the art knowledge of the ex... more The purpose of the present communication is to summarize the state-of-the art knowledge of the existing relationships between Eulerian and Lagrangian statistics in the literature. It will focus on integral scales, especially the classical Eulerian scales (such as those classically obtained from a fixed hot-wire or LDA control volume), the interesting moving Eulerian time scale (that obtained by a sensor which would move with the mean velocity) and the Lagrangian integral scale, most important for Lagrangian turbulent diffusion and dispersion simulations.Copyright © 2002 by ASME
Comptes Rendus de l Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy
Lagrangian-Lagrangian modelling enables a better understanding of the turbulent dispersion of hea... more Lagrangian-Lagrangian modelling enables a better understanding of the turbulent dispersion of heavy particles in turbulent flows. A new model is proposed here in order to simulate the turbulent shear and vorticity of the carrier fluid which interact, and to modify the trajectories of inertial particles. The model is then applied to the predictions of dispersion of spherical particles in a grid turbulence.
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy, 1998
The aim of this paper is to present modifications brought to a standard Lagrangian model for turb... more The aim of this paper is to present modifications brought to a standard Lagrangian model for turbulent dispersion so that the forces acting on a heavy particle in a turbulent boundary layer can be taken into account. A satisfying validation of this modified model for Lagrangian trajectography is then obtained and compared with the experimental results of Tanière et al.
Mechanics Research Communications, 1995
Atomization and Sprays, 1996
Engineering Turbulence Modelling and Experiments, 1996
Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Chemistry-Astronomy, 1997
The aim of this paper is to modify a basic Lagrangian model for turbulent dispersion so that the ... more The aim of this paper is to modify a basic Lagrangian model for turbulent dispersion so that the real turbulence seen by a heavy particle on its path can be taken into account. A satisfactory validation of this modified model is then done with the analytical relations of Wang and Stock (1993) in the case of homogeneous isotropic turbulence, without
Mechanics research …, 1998
Experimental Thermal and Fluid Science, 1998
The aim of this paper is to study experimentally the turbulent structure of an axisymmetric jet s... more The aim of this paper is to study experimentally the turbulent structure of an axisymmetric jet submerged in the co-¯owing stream of the test section of a wind tunnel. The experiments have been performed without and with three dierent velocities for the outer stream. The measurements were carried out by using Pitot tube and Stationary Hot-Wires. The in¯uence of the outer stream and the con®nement eect on the development of the turbulent jet are analyzed. It is shown that the streamwise variation of the excess mean velocity, the jet expansion and the spanwise distribution of the longitudinal normal Reynolds stress are close to that observed on free jets by other research groups. Self-similarity is also investigated. An extensive spectral analysis has also been done, and the centerline variations of the integral time scales and Taylor microscales are also presented. Only the third-order moment of the longitudinal velocity¯uctuation exhibits a radial distribution very dierent from that expected in free jets. In the case of no outer stream, it is shown that the con®nement eects dominate and modify signi®cantly the jet structure.