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Статті в журналах з теми "Euler-Lagrange numerical simulation":
1
Kozic, Mirko, Slavica Ristic, Mirjana Puharic, and Boris Katavic. "Numerical simulation of multiphase flow in ventilation mill and channel with louvers and centrifugal separator." Thermal Science 15, no. 3 (2011): 677–89. http://dx.doi.org/10.2298/tsci101203018k.
Анотація:
This paper presents the results of numerical flow simulation in ventilation mill of Kostolac B power plant, where louvers and centrifugal separator with adjustable blade angle are used. Numerical simulations of multiphase flow were performed using the Euler-Euler and Euler-Lagrange approach of ANSYS FLUENT software package. The results of numerical simulations are compared with measurements in the mill for both types of separators. Due to very complex geometry and large number of the grid cells, convergent solution with the Eulerian model could not be obtained. For this reason the mixture model was employed resulting in very good agreement with measurements, concerning the gas mixture distribution and velocity at the main and secondary burners. There was large difference between the numerical results and measurements for the pulverized coal distribution at the burners. Taking into consideration that we analyzed dilute mixture with very low volume fraction of the coal, the only choice was the Euler-Lagrange approach, i.e. discrete phase model limited to volume fraction of the discrete phase less than 10-12%. Obtained distributions of the coal at the burners agree well for both types of separators.
2
Sokolichin, A., G. Eigenberger, A. Lapin, and A. Lübert. "Dynamic numerical simulation of gas-liquid two-phase flows Euler/Euler versus Euler/Lagrange." Chemical Engineering Science 52, no. 4 (February 1997): 611–26. http://dx.doi.org/10.1016/s0009-2509(96)00425-3.
3
Song, Juan, and Shu Cai Li. "Study on Numerical Simulation of Explosion in Soil Based on Fluid-Solid Coupling Arithmetic." Applied Mechanics and Materials 580-583 (July 2014): 2916–19. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.2916.
Анотація:
Numerical simulations play a significant role in explosion in a mass of soil due to an underground explosive. Common methods available in hydrocode for fluid-solid coupling process are contact algorithm, Lagrange algorithm, and Arbitrary Lagrange-Euler (ALE) algorithm. A numerical simulation of explosion process with concentrated charge in a mass of soil was carried out by using three methods in this paper. The dynamic response of soil medium, the formation and development law of explosion cavity and the explosion wave propagation law in soil were simulated. Merits and drawbacks of three different methods are analyzed in the aspect of modeling, simulation results and computing cost.
4
Murray, J. J., and C. P. Neuman. "Linearization and Sensitivity Models of the Newton-Euler Dynamic Robot Model." Journal of Dynamic Systems, Measurement, and Control 108, no. 3 (September 1, 1986): 272–76. http://dx.doi.org/10.1115/1.3143779.
Анотація:
Within the framework of the Newton-Euler formulation of robot dynamics, linearized and trajectory sensitivity models are constructed about a nominal trajectory. The approach illustrates the property that linearization of the O(N) recursive Newton-Euler formulation leads to O(N) recursive algorithms. These algorithms are conceived for simulation, parameter identification, and real-time control applications which require the numerical evaluation of the linearized or trajectory sensitivity models. The O(N) linearized recursive algorithms complement their O(N5) linearized Lagrange (Lagrange-Euler) counterparts which are conceived for physical insight, and manipulator and controller design.
5
Liu, Xu, Mingbo Sun, Hongbo Wang, Peibo Li, Chao Wang, Guoyan Zhao, Yixin Yang, and Dapeng Xiong. "A Heterogeneous Parallel Algorithm for Euler-Lagrange Simulations of Liquid in Supersonic Flow." Applied Sciences 13, no. 20 (October 12, 2023): 11202. http://dx.doi.org/10.3390/app132011202.
Анотація:
In spite of its prevalent usage for simulating the full-field process of the two-phase flow, the Euler–Lagrange method suffers from a heavy computing burden. Graphics processing units (GPUs), with their massively parallel architecture and high floating-point performance, provide new possibilities for high-efficiency simulation of liquid-jet-related systems. In this paper, a central processing unit/graphics processing unit (CPU/GPU) parallel algorithm based on the Euler–Lagrange scheme is established, in which both the gas and liquid phase are executed on the GPUs. To realize parallel tracking of the Lagrange droplets, a droplet dynamic management method is proposed, and a droplet-locating method is developed to address the cell. Liquid-jet-related simulations are performed on one core of the CPU with a GPU. The numerical results are consistent with the experiment. Compared with a setup using 32 cores of CPUs, considerable speedup is obtained, which is as high as 32.7 though it decreases to 20.2 with increasing droplets.
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Longatte, E., Z. Bendjeddou, and M. Souli. "Application of Arbitrary Lagrange Euler Formulations to Flow-Induced Vibration Problems." Journal of Pressure Vessel Technology 125, no. 4 (November 1, 2003): 411–17. http://dx.doi.org/10.1115/1.1613950.
Анотація:
Most classical fluid force identification methods rely on mechanical structure response measurements associated with convenient data processes providing turbulent and fluid-elastic forces responsible for possible vibrations and damage. These techniques provide good results; however, they often involve high costs as they rely on specific modelings fitted with experimental data. Owing to recent improvements in computational fluid dynamics, numerical simulation of flow-induced structure vibration problems is now practicable for industrial purposes. As far as flow structure interactions are concerned, the main difficulty consists in estimating numerically fluid-elastic forces acting on mechanical components submitted to turbulent flows. The point is to take into account both fluid effects on structure motion and conversely dynamic motion effects on local flow patterns. This requires a code coupling to solve fluid and structure problems in the same time. This ability is out of limit of most classical fluid dynamics codes. That is the reason why recently an improved numerical approach has been developed and applied to the fully numerical prediction of a flexible tube dynamic response belonging to a fixed tube bundle submitted to cross flows. The methodology consists in simulating at the same time thermo-hydraulics and mechanics problems by using an Arbitrary Lagrange Euler (ALE) formulation for the fluid computation. Numerical results turn out to be consistent with available experimental data and calculations tend to show that it is now possible to simulate numerically tube bundle vibrations in presence of cross flows. Thus a new possible application for ALE methods is the prediction of flow-induced vibration problems. The full computational process is described in the first section. Classical and improved ALE formulations are presented in the second part. Main numerical results are compared to available experimental data in section 3. Code performances are pointed out in terms of mesh generation process and code coupling method.
7
Tao, Yujia, Xiulan Huai, Ziyi Guo, and Ran Yin. "Numerical simulation of spray performance based on the Euler-Lagrange approach." Journal of Thermal Science 18, no. 1 (February 18, 2009): 91–96. http://dx.doi.org/10.1007/s11630-009-0091-8.
8
Deen, N. G., M. A. Van Der Hoef, M. Van Sint Annaland, and J. A. M. Kuipers. "Numerical simulation of dense gas-particle flows using the Euler Lagrange approach." Progress in Computational Fluid Dynamics, An International Journal 7, no. 2/3/4 (2007): 152. http://dx.doi.org/10.1504/pcfd.2007.013007.
9
Tang, Guo Zhi, Yuan Ren, and Zhou Wang. "Localization Study of a Cold Atom BEC in Two-Dimensional Bessel Optical Lattices." Key Engineering Materials 787 (November 2018): 105–12. http://dx.doi.org/10.4028/www.scientific.net/kem.787.105.
Анотація:
In order to investigate the stability and dynamics properties of a cold atom Bose-Einstein Condensate (BEC) in two-dimensional Bessel optical lattices, the stability condition of the system is analyzed and the corresponding Gross-pitaevskii equation (GPE) is solved in this paper by time-dependent variational method and numerical simulation. Firstly, the Euler-Lagrange equation containing the parameters describing the system stability and the effective potential energy needed by the variational analysis method to analyze the system stability is obtained by using the adjustable exponent Gaussian trial wave function. Secondly, according to the analytical solution of Euler-Lagrange equation and the local minimum value of potential energy, the stability condition of the system is further illuminated. Finally, the influence mechanism of these parameters on the local dynamics is revealed by solving the corresponding GPE with numerical method.
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Li, Zhi Chuan, Qi Hu Sheng, Liang Zhang, Zhi Ming Cong, and Jin Jiang. "Numerical Simulation of Blade-Wake Interaction of Vertical Axis Tidal Turbine." Advanced Materials Research 346 (September 2011): 318–23. http://dx.doi.org/10.4028/www.scientific.net/amr.346.318.
Анотація:
To study the blade-wake interaction of vertical axis tidal turbine (VATT)，particles were placed in the flow field to trace blade wake during numerical simulation. Numerical simulations were conducted utilizing Euler-Lagrange model. In the simulations, the continuous phase was solved by Reynolds-averaged Navier-Stocks(RANS) equation combined with SST turbulence model and the particle trajectories of the dispersed phase were determined by momentum equation. Numerical results of predicting instantaneous blade forces and blade wakes showed good agreement with the test data. The model was also compared with previous classic free vortex model (V-DART), vortex method combined with finite element analysis (FEVDTM) and 2-D vortex panel model (VPM2D). It showed that the present model was much better than the former.
Дисертації з теми "Euler-Lagrange numerical simulation":
1
Feng, Aichun. "Numerical simulation of nonlinear wave-body problem based on desingularized Rankine source and mixed Euler-Lagrange method." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/366540/.
Анотація:
Rankine source method coupled with Mixed Euler-Lagrange (MEL) algorithm is developed to investigate wave-body problems. Under Euler specification a boundary-value problem is solved by placing fundamental singularities outside the computational domain and satisfying the boundary conditions at prescribed control points. At every time step, Lagrangian frame is applied to update the control points position during regridding process. A space increment method for source points distribution incorporating horizontal free surface source arrangement and vertical desingularized distance is developed and this method connects free surface panel to body panel size. By reducing the number of source points, this method significantly increases the computational efficiency. A single node scheme is implemented to treat intersection points. This scheme regards intersection points only as body panel ending points. The first source points on the free surface are placed away from the intersection points and generated wave is started from these source points rather than intersection points. During regridding process, body panel number keeps constant and panel size varies to match the variation of wetted body surface. In the process of repanelling the free surface, panels slide horizontally due to the variation of wetted body surface pushing them back and forth. After their horizontal positions are fixed, the source points follow the wave elevation and are located on the updated wave surface in the vertical direction. A least square based smoothing technique is developed to eliminate the "sawtooth" phenomenon occurred in the free surface updating for two-dimensional fully nonlinear problem. Both two- and three-dimensional forced body oscillatory motion problems are studied and extensive comparisons show a good agreement with published results. The methods developed are proved to be accurate, efficient and robust for wave-body problems.
2
Hervo, Loïc. "Simulation numérique de l’écoulement d’un mélange air et phase dispersée pour l’allumage d’une chambre de combustion aéronautique via un formalisme Euler Lagrange." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0043/document.
Анотація:
L'objectif de cette thèse est de contribuer au développement et à la validation d'outils numériques permettant la Simulation aux Grandes Echelles (SGE) de l'allumage d'un écoulement turbulent diphasique dans une chambre de combustion. Pour ce faire, une méthode de dépôt d'énergie modélisant l'apport d'énergie lié au claquage de la bougie d'allumage a été implémentée dans la chaîne de calcul CEDRE. Cette méthode a été validée sur une simulation de l'allumage d'un écoulement laminaire purement gazeux d'air et de propane. Une SGE de l'écoulement d'air du MERCATO a été effectué à l'aide du solveur Navier-Stokes CHARME de CEDRE. Cette simulation reproduit fidèlement l'écoulement turbulent non-réactif dans la chambre de combustion. Une méthode d'injection simplifiée FIMUR a été ajoutée au solveur lagrangien SPARTE de CEDRE. Dans cette méthode, des gouttes sont injectées directement au nez de l'injecteur avec une distribution de vitesse et de taille imposée. Une SGE de l'écoulement turbulent diphasique dispersé non-réactif dans la chambre MERCATO a ensuite été réalisée avec cette méthode. La comparaison des champs particulaires moyens de vitesse et de taille obtenus par simulation numérique avec les données expérimentales est satisfaisante. Enfin, des SGE de l'allumage de la chambre MERCATO ont été effectuées à partir du champ diphasique non-réactif simulé et de la méthode de dépôt d'énergie développée. Selon l'instant du dépôt d'énergie, les simulations conduisent à des allumages réussis ou ratés. La propagation de la flamme dans la chambre pour un allumage réussi a fait l'objet d'une analyse détaillée pour tenter de déterminer les principaux facteurs l'influençantThe goal of this thesis is to contribute to the development and validation of numerical tools for the Large Eddy Simulation (LES) of the ignition of a turbulent multiphase flow in a combustion chamber. An energy deposition method that models the energy supplied by the spark plug to the flow was implemented in the CEDRE code. This method was validated on a simulation of the ignition of a purely gaseous laminar propane-air flow. Then, a LES of the non-reacting gas flow in the monosector combustor MERCATO was performed with the Navier-Stokes solver CHARME of the CEDRE code. The comparison between simulations and experiments demonstrates that the main flow field features are well reproduced. In order to simulate the non-reacting dispersed two-phase flow of the same configuration, a simplified injection method called FIMUR was implemented in the Lagrangian solver SPARTE of the CEDRE code. In this method, droplets are injected directly at the tip of the injector with velocities deduced from experimental correlations while the size distribution is directly obtained from experimental data. The comparison of the mean droplet velocity and diameter fields in the vicinity of the injector between simulations and experiments appears satisfactory. Finally, LES's of the ignition of the MERCATO were performed using the non-reacting two-phase flow simulations and the aformentioned energy deposition method. Depending on the instant of energy deposition, the simulations lead to successful or failed ignitions. The flame propagation in a successful ignition was analysed in order to attempt to determine the physical phenomena at play and to better understand them
3
Chouippe, Agathe. "Étude numérique de la réduction de traînée par injection de bulles en écoulement de Taylor-Couette." Thesis, Toulouse, INPT, 2012. http://www.theses.fr/2012INPT0052/document.
Анотація:
La thèse porte sur l'étude de la réduction de traînée par injection de bulles. La réduction de traînée présente un intérêt pour les applications navales puisqu'elle est issue d'une modification des structures cohérentes qui contribuent le plus à la résistance à l'avancement. Le but de cette étude est d'analyser les mécanismes à l'origine de cette diminution du frottement pariétal. L'approche utilisée dans le cadre de cette étude est numérique, elle emploie le code JADIM par une approche Euler-Lagrange : la phase continue est simulée par Simulation Numérique Directe et la phase dispersée est simulée en suivant individuellement chaque bulle. La configuration retenue dans le cadre de cette étude est celle de l'écoulement de Taylor-Couette (écoulement compris entre deux cylindres en rotation). La première partie de la thèse vise à adapter l'outil numérique employé, afin de pouvoir prendre en compte le retour de la phase dispersée via des termes de forçage dans les équations bilan de matière et de quantité de mouvement. La deuxième partie de la thèse vise à étudier l'écoulement porteur en configuration monophasique, afin de disposer d'une référence sur l'écoulement non perturbé. La troisième partie de la thèse a pour objectif d'étudier la dispersion passive des bulles dans le système, afin d'analyser les mécanismes de migrations mis en jeu. Enfin la dernière partie de la thèse vise à étudier l'influence des bulles sur l'écoulement porteur en analysant l'effet de certains paramètres, notamment le taux de vide et la flottabilitéThe study deals with drag reduction induced by bubble injection, its application concerns naval transport. The aim of the study is to shed more light on mechanisms that are involved in this wall friction reduction. The study is based on a numerical approach, and use the JADIM code with an Euler-Lagrange approach: the continuous phase is solved by Direct Numerical Simulation, and the disperse phase by a tracking of each bubble. Within the framework of this study we consider the Taylor-Couette flow configuration (flow between two concentric cylinders in rotation). The first part of the study deals with the modification of the numerical tool, in order to take into account the influence of the disperse phase on the continuous one through forcing terms in the mass and momentum balance equations. The aim of the second part is to study de Taylor-Couette flow in its monophasic configuration, for the purpose of providing a reference of the undisturbed flow. The third part deals with the passive dispersion of bubble in Taylor-Couette flow, in order to analyze the migration mechanisms involved. And the aim of the last part is to study the effects of the disperse phase on the continuous one, by analyzing the influence of bubbly phase parameters (like void fraction and buoyancy)
4
Baillard, Clément. "Simulation numérique du refroidissement par spray en régime de Leidenfrost." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0327/document.
Анотація:
Dans l'industrie métallurgique, le refroidissement est une étape fondamentale qui permet de donner certaines qualités aux matériaux (résistance mécanique, souplesse). L'impact d'un spray est une méthode de refroidissement connue mais mal comprise, limitant aujourd'hui ses champs d'applications. Cette thèse vise à mettre en place un outil numérique apte à l'étude et à l'optimisation futur du refroidissement par spray. La littérature met en évidence la multitude des mécanismes du refroidissement, et le peu d'informations sur les liens entre ces mécanismes et les caractéristiques du spray (diamètre, vitesse et répartition spatiale des gouttes). Pour simuler le refroidissement, on propose de séparer l'étape d'écoulement du spray de celle du calcul du refroidissement de la plaque. Une corrélation sur la densité de flux de chaleur issue de la littérature permet de lier les deux étapes. Une analyse poussée du spray est réalisée grâce à plusieurs outils expérimentaux: Analyseur à Phase Doppler, caméra rapide, mesure de débit surfacique. Les éléments clefs pour caractériser puis initialiser le spray dans la simulation sont ainsi mis en évidences. La méthode d'initialisation, la configuration numérique (Euler-Lagrange, modèle RANS k-ω), ainsi que le domaine de calcul sont validés avec l'écoulement d'un spray libre. La méthode est ensuite utilisée pour simuler l'écoulement du spray en présence d'une plaque. Finalement, le refroidissement d'une plaque est simulé. On obtient la densité de flux de chaleur extraite de la plaque en fonction des caractéristiques du spray. Cette thèse soulève des questions sur des points de simulation couramment utilisés mais menant à des erreurs dans le calcul du refroidissementIn the metallurgy industry, the cooling is a fundamental stage which allows to bring certain qualities to materials (mechanical resistance, flexibility). The impact of a spray is one known process but it is not well understood, limiting its today's scopes. This thesis aims at developing a simulation procedure, in order to obtain a useful numerical tool for the study and the future optimization of the spray cooling. Literature highlights the multitude of the mechanisms of spray cooling, but also the few existing information linking these mechanisms and the characteristics of the spray (diameter, speed and space distribution of droplets). In order to simulate the spray cooling, one proposes to split this process in two stages, the spray flow and the calculation of the cooling. Based on the literature, a correlation on the density of flow of heat removed from the plat is used to link the two stages. A full spray characterization is realized thanks to several experimental tools: Phase Doppler Analyser, speed-camera, measure of surface liquid flow density. Key elements required to characterize and also to initialize the spray in the simulation, are highlighted as well. The method of initialization, the numerical configuration (Eulerian-Lagrangian simulation, RANS k-ω turbulence model), as well as the domain of calculation are validated with the simulation of a free-fall spray. The method is then used to calculate characteristics of the spray in the presence of a surface. Finally, the cooling of plate is simulated, bringing results on the heat flow density removed from the plate in accordance with characteristics of the spray. Main results concern the highlighting of major points of simulation communally used but leading to error in the cooling simulation
5
Bernard, Manuel. "Approche multi-échelle pour les écoulements fluide-particules." Phd thesis, Toulouse, INPT, 2014. http://oatao.univ-toulouse.fr/12239/1/Bernard.pdf.
Анотація:
Cette thèse porte sur l’étude numérique de la dynamique des écoulements fluide-particules au sein des lits fluidisés denses. Le but de ces travaux est d’améliorer la compréhension des phénomènes qui s’y déroulent afin d’optimiser les performances des procédés industriels confrontés à ces écoulements diphasiques. En effet, la diversité des échelles de longueur et les différents types d’interaction fluide-solide et solide-solide rencontrées dans ce type de configuration rendent cette catégorie d’écoulement particulièrement complexe et intéressante à étudier. Le modèle développé à cet effet permet de suivre individuellement la trajectoire des particules et de traiter les collisions avec leurs voisines tandis que la phase fluide est décrite de façon localement moyennée. Dans ce mémoire, nous présentons tout d’abord les origines physiques du phénomène de fluidisation d’une population de particules et les grandeurs physiques qui le caractérisent. Puis nous détaillons le modèle Euler-Lagrange implémenté et présentons une série de tests de validation basés sur des résultats théoriques et des comparaisons à des résultats expérimentaux. Cet outil numérique est ensuite employé pour simuler et étudier des lits fluidisés comportant jusqu’à plusieurs dizaines de millions de particules. Enfin, nous comparons des simulations réalisées conjointement à l’échelle micro et avec le modèle développé au cours de cette thèse à l’échelle méso.
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Anand, Karan. "Simulation numérique des interactions particule-particule et particule-paroi dans les écoulements turbulents chargés en particules non-sphériques." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP014.
Анотація:
Il est indéniable que les écoulements chargés de particules sont fréquents, tant dans la nature qu'au niveau industriel. Comprendre le comportement de ces écoulements est compliqué car, en plus de la nature stochastique de la phase porteuse turbulente, nous devons faire face au comportement aléatoire de la phase dispersée et à la manière dont elles s'influencent mutuellement. Il est impératif d'avoir une connaissance détaillée de la nature de la phase dispersée (distribution de la taille des particules, forme) et de la manière dont elle interagit avec les autres (collisions, forces électrostatiques). La majorité de la littérature existante sur les écoulements chargés de particules traite de particules sphériques idéalisées. Or, de nombreux processus, qu'ils soient naturels (cristaux de glace, grains de pollen, phytoplanctons) ou industriels (fibres textiles ou de pâte à papier, suie de combustion), comportent des particules dont la forme est anisotrope. L'étude du mouvement et de la dynamique d'une particule anisotrope dans une turbulence est une tâche difficile. Il faut tenir compte de l'orientation et du mouvement de rotation des particules, qui sont fortement couplés au mouvement de translation de la particule. On sait peu de choses sur l'effet des collisions si l'on suppose que les particules ont une forme généralement ellipsoïdale. Même les collisions sans frottement entraînent un transfert entre les énergies cinétiques de translation et de rotation. Ce couplage inhérent des mouvements de translation et de rotation peut modifier sensiblement la configuration de l'écoulement. En outre, les taux de collision et les échelles de temps pour les particules non-sphériques inertielles n'ont pas été étudiés dans ce cadre. L'objectif de cette étude est donc d'analyser les collisions dans des écoulements non homogènes statistiquement stables chargés de particules ellipsoïdales afin de comprendre, d'identifier l'effet dominant et de soutenir le développement d'approches statistiques lagrangiennes (Monte-Carlo) ou eulériennes. L'effet des collisions a été étudié et modélisé tout d'abord pour un écoulement gaz-solide en canal avec un mélange binaire de particules sphériques. Ensuite, les collisions ont été examinées pour des particules ellipsoïdales dans un écoulement granulaire sec. Enfin, l'effet de la forme des particules sur les collisions est étudié dans un écoulement en canal. Les forces de traînée et de portance du fluide ainsi que les couples appliqués aux particules ellipsoïdales ont été pris en compte dans ce casThere is no denying the fact that particle-laden flows are a frequent occurrence both naturally as well as at the industrial stage. Understanding the behaviour of these flows is complicated because, in addition to the stochastic nature of the turbulent carrier phase, we have to deal with the random behaviour of the dispersed phase and how they affect each other. It is imperative to have detailed knowledge regarding the nature of the dispersed phase (particle-size distribution, shape and how it interacts with one another (collisions, electrostatic forces). A majority of the existing literature on particle-laden flows deals with idealized spherical particles. Whereas, many processes including both natural (ice crystals, pollen grains, phytoplanktons) and industrial (textile or pulp fibres, combustion soot) have particles that are anisotropic in shape. Studying the motion and dynamics of an anisotropic particle in a turbulent is a challenging task. One has to take into account the orientation and rotational motion of the particles which are strongly coupled with the translational motion of the particle. Little is known regarding the effect of collisions if particles are assumed to have a generally ellipsoidal shape. Even frictionless collisions lead to transfer between translational and rotational kinetic energies. This inherent coupling of translation and rotational motion can noticeably change the configuration of the flow. Furthermore, the collision rates and timescales for inertial non-spherical particles have not been studied in this framework. Hence, the purpose of this study is to analyze collisions in non-homogeneous statistically steady flows loaded with ellipsoidal particles to understand, identify the dominant effect and support the development of statistical Lagrangian (Monte-Carlo) or Eulerian approaches. The effect of collisions has been investigated and modelled first for gas-solid channel flow with a binary mixture of spherical particles. Then collisions were examined for ellipsoidal particles in a dry granular flow. Finally, the effect of particle shape on collisions is studied in a channel flow. The fluid drag and lift forces as well as torques applied on the ellipsoidal particles were considered in this case
7
Caillau, Philippe. "Modélisation et simulation de la combustion turbulente par une approche probabiliste eulérienne lagrangienne." Rouen, 1994. http://www.theses.fr/1994ROUES080.
Анотація:
L'objet de cette thèse concerne la modélisation des écoulements réactifs turbulents. L'objectif visé consiste à développer un modèle susceptible de prédire la formation des polluants comme le monoxyde d'azote NO ou le monoxyde de carbone CO dans des foyers tridimensionnels complexes. Pour y parvenir, on fait appel à une approche probabiliste eulérienne lagrangienne (PEUL) où le champ de vitesse est calculé à l'aide des équations eulériennes de bilan moyennées et le champ de composition et de température par une méthode dite à transport de PDF (probability density function) lagrangienne. La modélisation des termes inconnus de dispersion turbulente et de mélange aux petites échelles est détaillée. Des mécanismes réduits et un mécanisme détaillé d'oxydation du combustible (qui est ici le méthane, CH4) ainsi que le mécanisme de formation du NO thermique sont introduits et testés. On présente les résultats obtenus avec le modèle PEUL dans trois configurations expérimentales. Les comparaisons calcul-expérience démontrent la capacité du modèle à prédire la formation du NO thermique et (partiellement) du prompt NO, du CO dans des configurations bi- et tridimensionnelles ainsi qu'à représenter correctement un régime d'extinction locale de la flamme.
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Pit, Fabienne. "Modélisation du mélange pour la simulation d'écoulements réactifs turbulents : essais de modèles eulériens lagrangiens." Rouen, 1993. http://www.theses.fr/1993ROUE5020.
Анотація:
Ce travail porte sur la modélisation et la simulation d'écoulements réactifs turbulents à chimie non infiniment rapide par une fonction densité de probabilité conjointe. La résolution de l'équation d'évolution temporelle de la PDF conjointe analytiquement ou numériquement est très complexe. En fait, le problème est simplifié en intégrant cette équation dans l'espace des vitesses. On obtient ainsi une approche hybride probabiliste eulérienne lagrangienne. Une méthode de Monte-Carlo est utilisée ensuite, pour simuler cette équation. Dans cette équation, le phénomène de mélange a petite échelle doit être représenté par un modèle. La comparaison d'un nouveau modèle de mélange avec des modèles classiques d'échange avec la moyenne a été faite dans le cas d'une couche de mélange thermique et dans le cas d'une couche de mélange réactive. Les résultats des calculs sont encourageants. La possibilité de l'appliquer à des configurations industrielles complexes 2D axisymétrique (le bluff-body) et 3D (chambre de combustion dextre) est démontrée
9
Bhatnagar, Akshay. "Direct Numerical Simulations of Fluid Turbulence : (A) Statistical Properties of Tracer And Inertial Particles (B) Cauchy-Lagrange Studies of The Three Dimensional Euler Equation." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/2747.
Анотація:
The studies of particles advected by tubulent flows is an active area of research
across many streams of sciences and engineering, which include astrophysics,
fluid mechanics, statistical physics, nonlinear dynamics, and also chemistry and biology. Advances in experimental techniques and high performance computing have made it possible to investigate the properties these
particles advected by fluid flows at very high Reynolds numbers. The main focus of this thesis is to study the statistics of Lagrangian tracers and heavy inertial particles in hydrodynamic and magnetohydrodynamic (MHD) turbulent
flows by using direct numerical simulations (DNSs). We also study the statistics of particles in model stochastic flows; and we compare our results for such models with those that we obtain from DNSs of hydrodynamic equations. We uncover some of aspects of the statistical properties of particle trajectories that have not been looked at so far. In the last part of the thesis we present some results that we have obtained by solving the three-dimensional
Euler equation by using a new method based on the Cauchy-Lagrange formulation. This thesis is divided into 6 chapters. Chapter 1 contains an introduction
to the background material that is required for this thesis; it also contains an
outline of the problems we study in subsequent Chapters. Chapter 2 contains
our study of “Persistence and first-passage time problems with particles in
three-dimensional, homogeneous, and isotropic turbulence”. Chapter 3 is devoted
to our study of “Universal Statistical Properties of Inertial-particle Trajectories
in Three-dimensional, Homogeneous, Isotropic, Fluid Turbulence”.
Chapter 4 deals with “Time irreversibility of Inertial-particle trajectories in
Homogeneous, Isotropic, Fluid Turbulence”. Chapter 5 contains our study
of the “Statistics of charged inertial particles in three-dimensional magnetohydrodynamic (MHD) turbulence”. Chapter 6 is devoted to our study of
“The Cauchy-Lagrange method for the numerical integration of the threedimensional
Euler equation”.
10
Bhatnagar, Akshay. "Direct Numerical Simulations of Fluid Turbulence : (A) Statistical Properties of Tracer And Inertial Particles (B) Cauchy-Lagrange Studies of The Three Dimensional Euler Equation." Thesis, 2016. http://hdl.handle.net/2005/2747.
Анотація:
The studies of particles advected by tubulent flows is an active area of research
across many streams of sciences and engineering, which include astrophysics,
fluid mechanics, statistical physics, nonlinear dynamics, and also chemistry and biology. Advances in experimental techniques and high performance computing have made it possible to investigate the properties these
particles advected by fluid flows at very high Reynolds numbers. The main focus of this thesis is to study the statistics of Lagrangian tracers and heavy inertial particles in hydrodynamic and magnetohydrodynamic (MHD) turbulent
flows by using direct numerical simulations (DNSs). We also study the statistics of particles in model stochastic flows; and we compare our results for such models with those that we obtain from DNSs of hydrodynamic equations. We uncover some of aspects of the statistical properties of particle trajectories that have not been looked at so far. In the last part of the thesis we present some results that we have obtained by solving the three-dimensional
Euler equation by using a new method based on the Cauchy-Lagrange formulation. This thesis is divided into 6 chapters. Chapter 1 contains an introduction
to the background material that is required for this thesis; it also contains an
outline of the problems we study in subsequent Chapters. Chapter 2 contains
our study of “Persistence and first-passage time problems with particles in
three-dimensional, homogeneous, and isotropic turbulence”. Chapter 3 is devoted
to our study of “Universal Statistical Properties of Inertial-particle Trajectories
in Three-dimensional, Homogeneous, Isotropic, Fluid Turbulence”.
Chapter 4 deals with “Time irreversibility of Inertial-particle trajectories in
Homogeneous, Isotropic, Fluid Turbulence”. Chapter 5 contains our study
of the “Statistics of charged inertial particles in three-dimensional magnetohydrodynamic (MHD) turbulence”. Chapter 6 is devoted to our study of
“The Cauchy-Lagrange method for the numerical integration of the threedimensional
Euler equation”.
Книги з теми "Euler-Lagrange numerical simulation":
1
GAMM Workshop on the Numerical Simulation of Compressible Euler Flows (1986 INRIA). Numerical simulation of compressible Euler flows: A GAMM Workshop. Braunschweig: Friedr. Vieweg & Sohn, 1989.
2
North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Computational aerodynamics based on the Euler equations. Neuilly-sur-Seine: AGARD, 1994.
Частини книг з теми "Euler-Lagrange numerical simulation":
1
Neumann, Sebastian, Amjad Asad, and Rüdiger Schwarze. "Numerical Simulation of Continuous Steel Casting Regarding the Enhancement of the Cleanliness of Molten Steel." In Multifunctional Ceramic Filter Systems for Metal Melt Filtration, 769–85. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-40930-1_30.
Анотація:
AbstractResearch results of this chapter show a great potential to improve inclusion removal from steel melts using active and reactive exchangeable filtration systems in steelmaking. This contribution investigates numerically the performance and the efficiency of the reactive cleaning and active filtration in continuous casting tundishes. For this purpose, a Euler–Lagrange model of the disperse two-phase flow of steel melt and non-metallic inclusions has been developed. Here, implicit large eddy simulations have been employed to resolve the large-scale turbulent structures in the tundish flows. By means of multiphase flow simulations, two prototype tundish configurations (laboratory one-strand tundish, industrial-scale two-strand tundish) were researched with alumina-coated, carbon-bonded ceramic foam hybrid filters. The research aimed the investigation of the effect of the filtration system, e.g. filter position, filter shapes and filter size on inclusion removal. The results of the numerical simulations indicated the high cleaning efficiencies obtained by using a reactive filter system, where reactively generated carbon monoxide bubbles carried a high amount of inclusions to the slag. Moreover, it was concluded from the results that the contribution of active filtration to inclusion removal by the deposition of inclusions on filter surfaces was neglectable compared to the contributions of reactive cleaning.
2
Spitzenberger, Andy, Katrin Bauer, and Rüdiger Schwarze. "Reactive Cleaning and Active Filtration in Continuous Steel Casting." In Multifunctional Ceramic Filter Systems for Metal Melt Filtration, 427–52. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-40930-1_17.
Анотація:
AbstractBasic fluid dynamic processes of melt filtration have been investigated in order to increase the performance and efficiency of filtration systems in steelmaking, especially for continuous steel casting. Numerical simulations have been performed to investigate the interactions between filter structures and the mean melt flow, the development of endogenous non-metallic inclusion (NMI) populations in the flow, and inclusion removal from the melt. For this purpose, Euler–Lagrange models of the particle-laden flow have been developed. As a major finding, the reactive cleaning process of the melt has been proven to be a very efficient cleaning method. Here, inclusion removal is strongly improved by the lifting action of reactively generated gas bubbles at the NMI surfaces. Details of the reactive cleaning process and the combination of reactive cleaning and active filtration have been investigated, too. The prediction quality of the numerical models with regard to fluid flow and the efficiency of the employed filtration systems have been successfully examined by comparing numerical simulations with the results from experimental investigations in different water model experiments and the steel casting simulator.
3
Martinez-Garcia, Edgar Alonso, and José A. Aguilera. "Dynamic Modelling and Control of an Underactuated Quasi-Omnidireccional Hexapod." In Handbook of Research on Advanced Mechatronic Systems and Intelligent Robotics, 377–400. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0137-5.ch016.
Анотація:
This chapter presents the mechanical design, dynamic model, and walking control law of an insect-like, asymmetric hexapod robot. The proposed model is an original walking mechanism designed with three actuators to provide quasi-omnidirectionality. One of the motivational aims is to reduce the number of actuators preserving similar holonomy as compared to popular 18-servo redundant hexapods with three servos per leg. This work includes the Klann mechanism as limb, two-drive differential robot's control, one per lateral triplet of legs. The legs of a triplet are synchronized in speed with different rotary angles phase. In addition, the six limbs are synchronized with bidirectional yaw motion. The proposed mechanical design has one servo for limbs yawing, one for the right limbs triplet and one motor for the left triplet. Thus, quasi-omnidirectional mobility is achieved. Furthermore, a dynamic control law that governs the robot's mechanisms motion is deduced, with an Euler-Lagrange approach. Kinematic and dynamic results are validated through numerical simulations using a tripod gait.
Тези доповідей конференцій з теми "Euler-Lagrange numerical simulation":
1
Yakubov, Sergey, Bahaddin Cankurt, Patrick Schiller, Moustafa Abdel Abdel-Maksoud, and Thomas Rung. "An Advanced Euler-Lagrange Approach to Numerical Simulation of Cavitating Engeneering Flows." In 8th International Symposium on Cavitation. Singapore: Research Publishing Services, 2012. http://dx.doi.org/10.3850/978-981-07-2826-7_063.
2
Huvelin, Fabien, Marcus Vinicius Girao de Morais, Franck Baj, Jean-Paul Magnaud, Elisabeth Longatte, and M’hamed Souli. "Numerical Simulation of Tube Bundle Vibrations Under Cross Flow." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26595.
Анотація:
The present paper is dealing with the simulation of instability for a moving tube in a fixed tube bundle. The purpose is to improve the understanding of the instability threshold phenomenon by means of comparisons between numerical, experimental and analytical solutions. An improved serial staggered procedure is used for the coupling between the fluid and the structure solvers and an Arbitrary Lagrange-Euler (ALE) method is introduced to solve the flow in the presence of moving structures. Two flow solvers are compared, one with finite volume and one with finite element method. The moving tube is assumed rigid. First, the added mass and damping coefficients of the moving tube are computed in quiescent fluid and they are compared to an analytical solution. Second, the vibrations of the tube in a tube bundle under laminar cross flows are computed in 2D for different inlet flow velocities which can reproduce the stable and unstable dynamic regime of the structure. Finally, the comparison between numerical simulations and experiment is investigated.
3
Masi, Enrica, Benoiˆt Be´dat, Mathieu Moreau, and Olivier Simonin. "Euler-Euler Large-Eddy Simulation Approach for Non Isothermal Particle-Laden Turbulent Jet." In ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/fedsm2008-55143.
Анотація:
This paper presents an Euler-Euler Large-Eddy Simulation (LES) approach for the numerical modeling of non isothermal dispersed turbulent two-phase flows. The proposed approach is presented and validated by a priori tests from an Euler-Lagrange database, provided using discrete particle simulation (DPS) of the particle phase coupled with direct numerical simulation (DNS) of the turbulent carrier flow, in a non isothermal particle-laden temporal jet configuration. A statistical approach, the Mesoscopic Eulerian Formalism (MEF) [Fe´vrier et al., J. Fluid Mech., 2005, vol. 533, pp. 1–46], is used to write local and instantaneous Eulerian equations for the dispersed phase and then, by spatial averaging, to derive the LES equations governing the filtered variables. In this work, the MEF approach is extended to scalar variables transported by the particles in order to develop LES for reactive turbulent dispersed two-phase flows with mass and heat turbulent transport. This approach leads to separate the instantaneous particle temperature distribution in a Mesoscopic Eulerian field, shared by all the particles, and a Random Uncorrelated distribution which may be characterized in terms of Eulerian fields of particle moments such as the uncorrelated temperature variance. In this paper, the DPS-DNS numerical database is presented, LES Eulerian equations for the dispersed phase are derived in the frame of the Mesoscopic approach and models for the unresolved subgrid and random uncorrelated terms are proposed and a priori tested using the DPS-DNS database.
4
Finn, Justin R., Sourabh V. Apte, and Ming Li. "Numerical Simulation of Sand Ripple Evolution in Oscillatory Boundary Layers." In ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting collocated with the ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fedsm2014-22065.
Анотація:
We perform simulations of sand ripple evolution in an oscillatory boundary layer flow typical of the ripple regime. The simulation framework is a parallel implementation of a three dimensional, variable density, incompressible flow solver, which solves the ensemble averaged Navier-Stokes equations on a fixed, structured grid. The sediment phase is evolved by computing hydrodynamic and inter-particle forces acting on each Lagrangian particle. Particle-particle collisions are treated with a soft sphere model incorporating both normal and tangential collision forces. Realistic and consistent coupling of the sediment to the Eulerian fluid phase is achieved through a typical inter-phase drag force term as well as the effects of volume displacement by the sediment. The Euler-Lagrange computational approach is developed in three-dimensions and its accuracy is verified using two test cases with analytic or empirically known solutions. It is then applied to simulate ripple evolution in oscillatory boundary layers and results are compared with Nielsens ripple predictor model as well as mixture-theory based Eulerian computations.
5
Cunha Caldeira Mesquita, Léo, Aymeric Vié, and Sébastien Ducruix. "Large Eddy Simulation of a Two-Phase Staged Swirling Burner Using an Euler-Lagrange Approach: Validation of the Injection Strategy." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76125.
Анотація:
A two-staged swirling burner is numerically simulated using Large Eddy Simulation (LES). This combustor uses two types of injection: a multipoint system that consists in 10 holes in a crossflow configuration, and a pilot system that uses a pressure-swirl atomizer. The relation between the rate of fuel injected from each injection system was found to be related with flame shape transition and hysteresis phenomena[4]. Also, the pilot spray was found to have a major role on these transitons, so it is of paramount importance to correctly reproduce its behavior on the numerical modeling, if one is interested in simulating these flame bifurcations. To describe the spray, a point-droplet approximation is used in a Lagrangian framework with the FIM-UR model [1], that has already proven its accuracy for several configurations. However, in this application it fails to reproduce the droplet size distribution, especially in the Central Recirculation Zone (CRZ), as it uses an arbitrary expression to impose the spray opening limits (which are not input parameters). In the present work, the input parameters of the FIM-UR model are modified to enable the recovery of the right droplet size distribution and improve the description of the liquid velocity field, resulting in a better numerical representation of the experimental results, essential for further studies.
6
Dao, Duy A., and Jürgen Grabe. "Numerical Investigation of Ship Anchor Penetration in Cohesive Baltic Sea Soil." In ASME 2022 41st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/omae2022-80822.
Анотація:
Abstract One of the main reasons for damage to embedded offshore infrastructure is anchor penetration. Sea cables, for example, are harmed either by direct anchor contact or by additional pressure caused by anchor dragging above the cable. A sufficient permanent burial depth is required to minimize the risk of failure due to anchor penetration. This work presents the numerical simulation of the penetration process of two ship anchors (HHP AC-14 and Spek) in cohesive soil of the Baltic Sea. The simulations are carried out using the Coupled Euler-Lagrange (CEL) method in Abaqus/Explicit. Baltic Sea silt, under undrained conditions, is modeled. For the creep, relaxation behavior, and velocity dependence of the soil, the visco-hypoplastic constitutive model, according to [1], is used. Soil parameters have been obtained by laboratory tests. A parametric study is conducted varying anchor type, mass, and velocity, which significantly influence penetration depth and penetration behavior.
7
Yang, Huadong, and Hong Xu. "Numerical Simulation of Gas-Solid Two Phase Flow in Fouled Axial Flow Compressor." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-26365.
Анотація:
Particles contained in air can deposit on the blade surface to cause fouling when lubricating oil and water steam are existed. Fouling changes blade geometry and blade surface roughness is increased, thus aerodynamic performance is affected. Many researchers simulated axial flow compressor fouling by adding constant surface roughness and modifying blade thickness which can’t reflect the real status of fouled compressor. In this paper, reverse technology is introduced to reconstruct the solid model of fouled compressor which is imported into fluid flow simulation software. The flow of gas phase and gas-solid coupling phase are implemented to reveal the nature of flow in fouled axial flow compressor. Based on Euler-Lagrange model, this paper made numerical simulation of gas-solid two phase flow in the axial flow compressor rotor cascade. Simulation result shows that fouling causes the decrease of effective flow area, thus thermodynamic performance is degraded. Gas-solid phase flow shows that particles are not uniformly deposited on the blade surface. When particle is smaller and rotor blade is rough, it is more easily deposited on the surface. And particle mass concentration is affected by ambient conditions such as inlet temperature, rotational speed, particle diameter, particle mass flow rate.
8
Westerkamp, Diederik, Andriarimina Daniel Rakotonirina, Bruno Sainte-Rose, and Ton van den Bremer. "Numerical Simulation of the Wave-Induced Drift of Disc-Shaped Floating Plastic Debris." In ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/omae2023-103606.
Анотація:
Abstract Floating plastic debris poses a significant threat to the health of the world’s oceans and ecosystems. Understanding the pathways of floating marine litter is crucial in designing effective solutions to mitigate this problem. The Ocean Cleanup aims to build simple but reliable numerical models to better predict plastic accumulation zones. In this context, a Lagrangian point-particle model has been developed that can help better understand wave-induced drift. The continuous and the discrete phase are coupled in a one-way fashion using a micro-scale Euler-Lagrange approach. The Maxey-Riley equation is modified to account for disc-shaped objects, variable submergence, and two-directional drag correlation. By comparing our numerical predictions with experimental work, we demonstrate that floating discs can experience up to 73% increased wave-induced drift compared to Stokes drift. We show that the non-Lagrangian behaviour of objects is mainly dependent on the water-plastic density ratio and its size compared to the wavelength. Two key physical mechanisms contributing to increased drift effects are investigated, both related to the particle’s variable submergence. Finally, we provide an overview of the computational limitations and the model sensitivities that can help to improve the accuracy of numerical wave-induced drift predictions.
9
Schilling, M., S. Schütz, M. Piesche, Liejin Guo, D. D. Joseph, Y. Matsumoto, Y. Sommerfeld, and Yueshe Wang. "Numerical simulation of the transport and deposition behaviour of particles on filter fibres using Euler-Lagrange Method and coupling of CFD and DEM." In THE 6TH INTERNATIONAL SYMPOSIUM ON MULTIPHASE FLOW, HEAT MASS TRANSFER AND ENERGY CONVERSION. AIP, 2010. http://dx.doi.org/10.1063/1.3366464.
10
Hatecke, Hannes, Stefan Krüger, Jakob Christiansen, and Hendrik Vorhölter. "A Fast Sea-Keeping Simulation Method for Heavy-Lift Operations Based on Multi-Body System Dynamics." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23456.
Анотація:
This paper presents a fast numerical method to analyze heavy-lift operations of ships in short crested waves. For this purpose, a sea-keeping simulation method for the coupled motions of a heavy-lift vessel and a freely suspended load is developed. The method considers the motions of the ship in six degrees-of-freedom and the suspended load as a point mass. The coupling of the multi-rigid-body system of the ship and the suspended load is considered by solving the equation of roll motion together with the Euler-Lagrange equations of the load. This approach allows the simulation of several hours of real time motion in short crested waves within only a few seconds. Consequently, the method is particularly suitable when very long or numerous sea-keeping simulations or statistical results are required. Moreover, the method is applied to evaluate the sea-keeping capabilities of a heavy-lift vessel during a lifting operation conducted offshore in 2013.