Academic literature on the topic 'Lagrangienne'
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Journal articles on the topic "Lagrangienne"
Latour, François. "Transversales lagrangiennes, périodicité de Bott et formes génératrices pour une immersion lagrangienne dans un cotangent." Annales scientifiques de l'École normale supérieure 24, no. 1 (1991): 3–55. http://dx.doi.org/10.24033/asens.1619.
Full textEtienne, Stéphane, and Yves-Marie Scolan. "Résolution lagrangienne d'écoulements bidimensionnels turbulents." Comptes Rendus de l'Académie des Sciences - Series IIB - Mechanics-Physics-Astronomy 328, no. 1 (January 2000): 91–96. http://dx.doi.org/10.1016/s1287-4620(00)88422-7.
Full textRIVOAL, TANGUY. "APPLICATIONS ARITHMÉTIQUES DE L'INTERPOLATION LAGRANGIENNE." International Journal of Number Theory 05, no. 02 (March 2009): 185–208. http://dx.doi.org/10.1142/s1793042109001992.
Full textHulin, Alexandre, and Elie Znaty. "Approche Lagrangienne des écoulements diphasiques multidimensionnels." La Houille Blanche, no. 1-2 (February 1996): 71–76. http://dx.doi.org/10.1051/lhb/1996009.
Full textBoualem, Hassan, Robert Brouzet, Joseph Rakotondralambo, and Francisco-Javier Turiel. "Fibration lagrangienne munie d'une pseudo-métrique compatible." Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 326, no. 10 (May 1998): 1201–4. http://dx.doi.org/10.1016/s0764-4442(98)80227-9.
Full textCagnoux, J. "ANALYSE LAGRANGIENNE SUR UNE ONDE LONGITUDINALE SPHÉRIQUE." Le Journal de Physique Colloques 46, no. C5 (August 1985): C5–575—C5–581. http://dx.doi.org/10.1051/jphyscol:1985574.
Full textLalonde, Fran\ccois. "Suppression lagrangienne de points doubles et rigidité symplectique." Journal of Differential Geometry 36, no. 3 (1992): 747–64. http://dx.doi.org/10.4310/jdg/1214453187.
Full textBillionnet, A., and S. Elloumi. "Placement de tâches dans un système distribué et dualité lagrangienne." RAIRO - Operations Research 26, no. 1 (1992): 83–97. http://dx.doi.org/10.1051/ro/1992260100831.
Full textVioleau, Damien, and Clément Buvat. "Modélisation numérique lagrangienne de barrages flottants et de nappes d’hydrocarbures." La Houille Blanche, no. 5 (October 2007): 80–84. http://dx.doi.org/10.1051/lhb:2007064.
Full textBerlemont, Alain, Zhezou Chang, and Gérard Gouesbet. "Une approche lagrangienne pour la simulation d'interactions particule/particule en écoulement." La Houille Blanche, no. 1-2 (February 1996): 57–63. http://dx.doi.org/10.1051/lhb/1996007.
Full textDissertations / Theses on the topic "Lagrangienne"
Wattez, Adrien. "Simulation de fluides, approche lagrangienne." Mémoire, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/5940.
Full textStelzenmuller, Nickolas. "Étude Lagrangienne d'une turbulence inhomogène." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI109/document.
Full textInhomogeneous turbulence is experimentally investigated in a Lagrangian framework. Measurements of tracer and non-tracer particles in a turbulent channel were made, and were used to extract Lagrangian statistics conditioned on their initial distance to the channel wall. Highly resolved in time and space, these measurements provide the three components of position, velocity, and acceleration along a particle trajectory from very close to the channel wall ($y^+approx 10$) to the channel center. Lagrangian time correlations allow the direct measurement of velocity and acceleration timescales in each direction, and characterize the inhomogeneity and anisotropy of the turbulent channel from the Lagrangian perspective. Small scale-anisotropy, characterized by the skewness and the correlation of the components of the acceleration, was found to be significant throughout the channel. Significant scale separation between the magnitude and components of acceleration was found across the channel, even in the near-wall region. Two classes of non-tracer particle trajectories were also measured, allowing direct comparison of tracer and non-tracer statistics from the highly-sheared anisotropic zone near the channel wall to the more homogeneous outer layer. Non-tracer acceleration statistics in the turbulent channel were found to be significantly different from similar results in homogeneous, isotropic turbulence. These statistics are necessary components of advanced Lagrangian stochastic models to predict dispersion and mixing in inhomogeneous turbulence
ZOUARI, NAJET. "Dispersion lagrangienne en turbulence bidimensionnelle." Paris 6, 1990. http://www.theses.fr/1990PA066778.
Full textClain, Gaëlle. "Etude des sources d'ozone avec une approche lagrangienne." Phd thesis, Université de la Réunion, 2009. http://tel.archives-ouvertes.fr/tel-01057143.
Full textClain, Gaëlle. "Étude des sources d'ozone avec une approche lagrangienne." La Réunion, 2009. http://elgebar.univ-reunion.fr/login?url=http://thesesenligne.univ.run/09_15_clain.pdf.
Full textEmissions of ozone precursors by biomass burning activity in south Africa and Madagascar and stratospheric intrusions are the two sources controlling tropospheric ozone at Reunion. Located at 21°S, the site is strongly impacted by the subtropical jet stream activity during austral winter and spring. Ozone measurements at Reunion started in 1992 with the first radiosoundings. The measurements were enriched from 1998 with the installation of a LIDAR at the station. Ozone radiosonde measurements are also performed at Irene (South Africa) since 1990. In 1998, Irene and la Reunion joined the SHADOZ network (Thompson et al. 2003). The study presented here intend to analyse the ozone database with a lagrangian approach in order to compare the impact of photochemical and stratospheric sources on the tropospheric ozone burden in the region. This work starts with a comparative study of tropospheric ozone climatology and trends at two regional sites: La Reunion and Irene. The tropospheric ozone trends have been calculated both considering the whole tropospheric column and dividing the troposphere into three atmospheric sections standing for lower, middle and upper troposphere. The examination of data, the climatological studies and the trend calculations have revealed the specific features of data, the climatological characteristics of tropospheric ozone in the region and allowed to hypothesize on the importance of regional sources. The analysis of the ozone database at Reunion with the lagrangian trajectory code Lacytraj revealed the seasonal behaviour of stratospheric intrusions, their seasonal features such as the depth of intrusions, the value of ozone mixing ratio in stratospheric air masses and vertical seasonal distributions of stratospheric intrusions
Idrissi, Kaitouni. "Contribution à la modélisation lagrangienne des robots manipulateurs." Compiègne, 1985. http://www.theses.fr/1985COMPS131.
Full textMordant, Nicolas. "Mesure lagrangienne en turbulence : mise en oeuvre et analyse." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2001. http://tel.archives-ouvertes.fr/tel-00003926.
Full textéchelles. Pour ce faire, nous avons mis au point une nouvelle technique de mesure de vitesse lagran- gienne dans un écoulement turbulent à haut nombre de Reynolds. Le principe choisi est basé sur l'utilisation de l'effet Doppler d'une onde ultrasonore monochromatique diffusée par une petite par- ticule solide. Le signal diffusé est reçu par un réseau de récepteurs et mis en forme par une électro- nique rapide et ultrafaible bruit conçue spécialement au cours de ce travail. Pour extraire la modula- tion de fréquence due à la vitesse, nous avons développé un algorithme d'estimation spectrale basé sur une méthode de maximum de vraisemblance approché couplé à un filtre de Kalman. Nous avons ainsi accès à la vitesse lagrangienne sur des échelles temporelles englobant le régime inertiel et les grandes échelles de l'écoulement. Le champ de vitesse est gaussien à décorrélation temporelle exponentielle. On obtient ainsi un spectre temporel à décroissance conforme à la prédiction de la théorie de Kolmogorov 41. Le régime inertiel lagrangien se prolonge jusqu'à des échelles temporelles inférieures au temps de Kolmogorov. On observe une intermittence lagrangienne plus intense (en termes de courbure des exposants de structure) que pour le champ eulérien et dont l'intensité ne peut être reproduite par le modèle usuel basé sur la dissipation. Cette intermittence est liée à l'existence de corrélations tempo- relles très longues de la valeur absolue des incréments temporels de vitesse.
Liechtenstein, Lukas. "Dynamique eulérienne et lagrangienne des écoulements turbulents stratifiés tournants." Ecully, Ecole centrale de Lyon, 2005. http://bibli.ec-lyon.fr/exl-doc/lliechtenstein.pdf.
Full textDirect numerical simulations of stably stratified and rotating turbulence develop characteristic coherent structures in the flow. When looking at iso-enstrophy surfaces, flat pancakes for dominant stratification or vertically elongated cigars for dominant rotation are observed. The linear and the nonlinear evolution of single-time second order Eulerian statistics differ significantly. Linear dynamics only show a marginal development of anisotropy. Nonlinear dynamics are responsible for the formation of the typical structures mentioned above, which can be associated with anisotropy in second order Eulerian statistics generated by DNS. This is illustrated by directional spectra which show characteristic features for anisotropic turbulence. Dominantly rotating turbulence shows a high anisotropy at the smallest scales and a weak anisotropy at energy containing scales, both in the toroidal and poloidal parts of the velocity field. Dominantly stratified cases show a high anisotropy only in the toroidal part and at intermediate scales. The poloidal energy spectrum is similar to the potential energy spectrum namely exhibiting a high degree of isotropy. When looking at Lagrangian statistics, the differences between linear and nonlinear dynamics melt away. We compare Lagrangian statistics by three methods. The first is a strictly linear model which uses two-time Eulerian statistics (RDT/SCH). The second and third methods solve the nonlinear particle advection equation in flow fields with linear (KS) and nonlinear (DNS) time evolutions. Although quantitative differences appear, the similarity of the statistics generated by the three methods is remarkable. We conclude that a nonlinearity is needed to break single-time second order isotropy. However, isotropy can be broken with linear dynamics by using second order statistics evaluated at different times, a concept intrinsic to the Lagrangian formalism
Mordant, Nicolas. "Mesure lagrangienne en turbulence : mise en uvre et analyse." Lyon, École normale supérieure (sciences), 2001. http://www.theses.fr/2001ENSL0199.
Full textGasteuil, Yoann. "Instrumentation Lagrangienne en Turbulence : Mise en œuvre et Analyse." Lyon, École normale supérieure (sciences), 2009. http://www.theses.fr/2009ENSL0541.
Full textThe aim of this PhD thesis is the experimental study of turbulence from a Lagrangian point of view. To do so, we have designed a new measurement based on the use of active instrumented probes. We have developed "instrumented particles" in the form of spherical shells with a diameter of 1. 5-2 cm. They include a battery, an electronic circuit, sensors and a radio frequency transmitter as a data link to the lab. The whole system is neutrally buoyant with respect to the surrounding fluid (water). The first instrumented particle includes a temperature measurement and has been used in a Rayleigh-Bénard convection cell. It gives an original insight on the role of thermal plumes in the transport of heat. In view of studying forces on objects advected by turbulent flows, a second probe has been designed which includes a 3-dimensional measurement of the acceleration of the sphere. Measurements have been made in a von Kármán flow, and also in a very large spherical Couette flow at the University of Maryland. These studies have raised the question of the 6-dimensional dynamics - translation and rotation - of a sphere advected by a turbulent flow field. This issue has been addressed in detail from optical tracking of the sphere positions and orientations. The dynamics of translation is found to be surprisingly similar to that of Lagrangian tracer particles and the dynamics of orientation has revealed a surprisingly high level of intermittency
Books on the topic "Lagrangienne"
Audin, Michèle. Cobordismes d'immersions lagrangiennes et legendriennes. Paris: Hermann, 1987.
Find full textDesprés, Bruno. Lois de Conservations Eulériennes, Lagrangiennes et Méthodes Numériques. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11657-5.
Full textservice), SpringerLink (Online, ed. Lois de Conservations Eulériennes, Lagrangiennes et Méthodes Numériques. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2010.
Find full textOllitrault, Michel. Traitement des donnees de Flotteurs Lagrangiens Sofar. Paris: IFREMER, 1987.
Find full textMielke, Alexander. Hamiltonian and Lagrangian flows on center manifolds: With applications to elliptic variational problems. Berlin: Springer-Verlag, 1991.
Find full textGignoux, Silvestre-Br. Mécanique. de la formule lagrangienne au chaos hamiltonien. EDP Sciences, 2002.
Find full textCombet, E. Integrales Exponentielles: Developpements Asymptotiques, Proprietes Lagrangiennes. Springer London, Limited, 2006.
Find full textBook chapters on the topic "Lagrangienne"
Muller, Marie-Paule. "Une sphere Lagrangienne plongee dans une structure symplectique complete sur ℝ6." In Lecture Notes in Mathematics, 235–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/bfb0097474.
Full textAudin, Michèle. "Classes caracteristiques lagrangiennes." In Algebraic Topology Barcelona 1986, 1–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/bfb0082997.
Full textDesprés, Bruno. "Systèmes lagrangiens multidimensionnels." In Lois de Conservations Eulériennes, Lagrangiennes et Méthodes Numériques, 221–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11657-5_7.
Full textCarpentier, Pierre, and Guy Cohen. "Régularisation et Lagrangien augmenté." In Décomposition-coordination en optimisation déterministe et stochastique, 123–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-55428-9_5.
Full textCottet, Georges-Henri, Emmanuel Maitre, and Thomas Milcent. "Méthodes Level Set et interfaces lagrangiennes." In Mathématiques et Applications, 1–35. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70075-1_1.
Full textCrouzeix, Jean-Pierre, Abdelhak Hassouni, and Eladio Ocaña-Anaya. "Dualité, Lagrangien, Points de Selle." In Optimisation convexe et inéquations variationnelles monotones, 65–116. Cham: Springer Nature Switzerland, 2012. http://dx.doi.org/10.1007/978-3-031-30681-5_3.
Full textGiroux, Emmanuel. "Formes generatrices d’immersions lagrangiennes dans un espace cotangent." In Lecture Notes in Mathematics, 139–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/bfb0097468.
Full textDesprés, Bruno. "Introduction." In Lois de Conservations Eulériennes, Lagrangiennes et Méthodes Numériques, 1–3. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11657-5_1.
Full textDesprés, Bruno. "Modèles." In Lois de Conservations Eulériennes, Lagrangiennes et Méthodes Numériques, 5–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11657-5_2.
Full textDesprés, Bruno. "Étude d’une loi de conservation." In Lois de Conservations Eulériennes, Lagrangiennes et Méthodes Numériques, 39–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11657-5_3.
Full textConference papers on the topic "Lagrangienne"
Baghdadi, N., P. Broche, and J. Gaggelli. "Courantométrie eulérienne et lagrangienne par radar VHF." In Journées Nationales Génie Côtier - Génie Civil. Presses Universitaires de Perpignan, 1994. http://dx.doi.org/10.5150/jngcgc.1994.020-b.
Full textCASTELLE, Bruno, Hervé MICHALLET, Vincent MARIEU, Fabien LECKLER, Benjamin DUBARDIER, Adrien LAMBERT, Céline BERNI, et al. "Modélisation physique des courants d'arrachement : apport des mesures lagrangiennes." In Journées Nationales Génie Côtier - Génie Civil. Editions Paralia, 2010. http://dx.doi.org/10.5150/jngcgc.2010.007-c.
Full textJanin, Jean-Marc, and Franck Dumas. "Modélisation fine des dérives lagrangiennes en Manche par un code aux éléments finis." In Journées Nationales Génie Côtier - Génie Civil. Presses Universitaires de Perpignan, 1994. http://dx.doi.org/10.5150/jngcgc.1994.002-j.
Full textBERTIN, Sloane, Anna RUBIO, Ismael HERNANDEZ-CARRASCO, Lohitzune SOLABARRIETA, Irene RUIZ, Alejandro ORFILA, and Alexei SENTCHEV. "Identification des zones de convergence par le calcul de métriques Lagrangiennes à partir de champs de courant de surface issus de modèles tridimensionnels et radar HF : Application à l'étude du transport des déchets marins dans le golfe de Gascogne." In Journées Nationales Génie Cotier - Genie Civil, 13–24. Editions Paralia, 2024. http://dx.doi.org/10.5150/jngcgc.2024.002.
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