Letteratura scientifica selezionata sul tema "Problème de Convection-diffusion"
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Articoli di riviste sul tema "Problème de Convection-diffusion"
Gaultier, Maurice, e Mikel Lezaun. "Un problème de convection-diffusion avec réaction chimique". Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 324, n. 2 (gennaio 1997): 159–64. http://dx.doi.org/10.1016/s0764-4442(99)80336-x.
Testo completoBen-Abdallah, Philippe, Hamou Sadat e Vital Le Dez. "Résolution d'un problème inverse de convection–diffusion par une méthode de perturbation singulière". International Journal of Thermal Sciences 39, n. 7 (luglio 2000): 742–52. http://dx.doi.org/10.1016/s1290-0729(00)00279-9.
Testo completoDalík, Josef. "A Petrov-Galerkin approximation of convection-diffusion and reaction-diffusion problems". Applications of Mathematics 36, n. 5 (1991): 329–54. http://dx.doi.org/10.21136/am.1991.104471.
Testo completoMartynova, T. S., G. V. Muratova, I. N. Shabas e V. V. Bavin. "Многосеточные методы с косо-эрмитовыми сглаживателями для задач конвекции–диффузии с преобладающей конвекцией". Numerical Methods and Programming (Vychislitel'nye Metody i Programmirovanie), n. 1 (31 gennaio 2022): 46–59. http://dx.doi.org/10.26089/nummet.v23r104.
Testo completoDalík, Josef, e Helena Růžičková. "An explicit modified method of characteristics for the one-dimensional nonstationary convection-diffusion problem with dominating convection". Applications of Mathematics 40, n. 5 (1995): 367–80. http://dx.doi.org/10.21136/am.1995.134300.
Testo completoDolejší, V., M. Feistauer e C. Schwab. "On discontinuous Galerkin methods for nonlinear convection-diffusion problems and compressible flow". Mathematica Bohemica 127, n. 2 (2002): 163–79. http://dx.doi.org/10.21136/mb.2002.134171.
Testo completoGoldstein, C. I. "Preconditioning convection dominated convection‐diffusion problems". International Journal of Numerical Methods for Heat & Fluid Flow 5, n. 2 (febbraio 1995): 99–119. http://dx.doi.org/10.1108/eum0000000004059.
Testo completoStynes, Martin. "Steady-state convection-diffusion problems". Acta Numerica 14 (19 aprile 2005): 445–508. http://dx.doi.org/10.1017/s0962492904000261.
Testo completoKashyap, Pradeep. "Convection Diffusion Problems Solved by Fractional Variational Iteration Method". RESEARCH HUB International Multidisciplinary Research Journal 9, n. 3 (23 marzo 2022): 01–07. http://dx.doi.org/10.53573/rhimrj.2022.v09i03.001.
Testo completoRoos, Hans-Görg, e Martin Stynes. "Necessary conditions for uniform convergence of finite difference schemes for convection-diffusion problems with exponential and parabolic layers". Applications of Mathematics 41, n. 4 (1996): 269–80. http://dx.doi.org/10.21136/am.1996.134326.
Testo completoTesi sul tema "Problème de Convection-diffusion"
Etchegaray, Christèle. "Modélisation mathématique et numérique de la migration cellulaire". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS428/document.
Testo completoCollective or individual cell displacements are essential in fundamental physiological processes (immune response, embryogenesis) as well as in pathological developments (tumor metastasis). The intracellular processes responsible for cell motion have a complex self-organized activity spanning different time and space scales. Highlighting general principles of migration is therefore a challenging task.In a first part, we build stochastic particular models of migration. To do so, we describe key intracellular processes as discrete in space by using stochastic population models. Then, by a renormalization in large population, infinitesimal size and accelerated dynamics, we obtain continuous stochastic equations for the dynamics of interest, allowing a relation between the intracellular dynamics and the macroscopic displacement.First, we study the case of a leukocyte carried by the blood flow and developing adhesive bonds with the artery wall, until an eventual stop. The binding dynamics is described by a stochastic Birth and Death with Immigration process. These bonds correspond to resistive forces to the motion. We obtain explicitly the mean stopping time of the cell.Then, we study the case of cell crawling, that happens by the formation of protrusions on the cell edge, that grow on the substrate and exert traction forces. We describe this dynamics by a structured population process, where the structure comes from the protrusions' orientations. The limiting continuous model can be analytically studied in the 1D migration case, and gives rise to a Fokker-Planck equation on the probability distribution for the protrusion density. For a stationary profile, we can show the existence of a dichotomy between a non motile state and a directional displacement state.In a second part, we build a deterministic minimal migration model in a discoïdal cell domain. We base our work on the idea such that the structures responsible for migration also reinforce cell polarisation, which favors in return a directional displacement. This positive feedback loop involves the convection of a molecular marker, whose inhomogeneous spatial repartition is characteristic of a polarised state.The model writes as a convection-diffusion problem for the marker's concentration, where the advection field is the velocity field of the Darcy fluid that describes the cytoskeleton. Its active character is carried by boundary terms, which makes the originality of the model.From the analytical point of vue, the 1D model shows a dichotomy depending on a critical mass for the marker. In the subcritical and critical cases, it is possible to show global existence of weak solutions, as well as a rate-explicit convergence of the solution towards the unique stationary profile, corresponding to a non-motile state. Above the critical mass, for intermediate values, we show the existence of two additional stationary solutions corresponding to polarised motile profiles. Moreover, for asymmetric enough initial profiles, we show the finite time apparition of a blowup.Studying a more complex model involving activation of the marker at the cell membrane permits to get rid of this singularity.From the numerical point of vue, numerical experiments are led in 2D either in finite volumes (Matlab) or finite elements (FreeFem++) discretizations. They allow to show both motile and non motile profiles. The effect of stochastic fluctuations in time and space are studied, leading to numerical simulations of cases of responses to an external signal, either chemical (chemotaxis) or mechanical (obstacles)
Bouyssier, Julien. "Transports couplés en géométries complexes". Toulouse 3, 2012. http://thesesups.ups-tlse.fr/1929/.
Testo completoThis work interest is about stationary transfer and non-stationary transport by convection-diffusion onto complex geometries. For transport issues, complex refers to convection into flattened cavity of arbitrary transverse shape, slowly varying along the longitudinal direction. In the context of transfer, complex refers to non-axisymmetric domains of arbitrary transverse shape along which one or several parallel tubes convect heat or mass. For the transfer problem, this work extends the principle, validates the use, and illustrates the efficiency of Graetz modes decompositions for exchanges prediction in realistic exchangers configurations. This decomposition permits to formulate the initial 3D problem as a generalysed 2D eigenvalue problem, the numerical evaluation of which is drastically reduced. We generalyze Graetz modes solutions for arbitrary applied lateral boundary conditions. In the particular case of balanced exchangers, we bring to the fore a new neutral mode whose longitudinal variations are linear as opposed to classical Graetz modes displaying exponential decay. The numerical computation of those modes for semi-infinite configurations with lateral periodic boundary conditions shows that a few number of those provides a very good approximation for exchanges. In the case of finite exchangers coupled with inlet/oulet tubes, we show how to evaluate the amplitudes of Graetz modes in the various domains (inlet, exchanger, outlet) from functional minimization associated with input/output boundary conditions. The evaluation of these amplitudes permit a systematic parametric study of temperature fields, heat fluxes between fluid and solid, and hot/cold performance of a couple-tube exchanger. Our results indicate that the typical exchange length is governed by the first Graetz mode at large P\'eclet number. We also show that a symmetric exchanger has a symmetric spectrum and a upward/backward symmetric evolution. In the case transport we elaborate theoretically the conservative form of 3D Taylor dispersion equations into variable cavities which generalyzes the framework already known in 2D. We numerically implement these averaged dispersion equations with finite element, and validate in 2D the obtained results. We show that 3D longitudinal variations of a cavity has a strong impact on the longitudinal dispersion
Di, Pietro Daniele Antonio. "Méthodes non conformes pour des équations aux dérivées partielles avec diffusion". Habilitation à diriger des recherches, Université Paris-Est, 2010. http://tel.archives-ouvertes.fr/tel-00550230.
Testo completoAoun, Mirella. "Analyse et analyse numérique d'EDP issues de la thermomécanique des fluides". Electronic Thesis or Diss., Normandie, 2023. http://www.theses.fr/2023NORMR093.
Testo completoIn this thesis, we focus on nonlinear evolutionary systems derived from a non-isothermal solidification problem with melt convection. These systems consist of three partial differential equations. The first is the phase-field equation coupled with the heat equation and the incompressible Navier-Stokes equation. More precisely, we are interested in the existence of solutions for these types of systems in the two-dimensional and the three-dimensional cases, and in the convergence of a finite volume approximation. One of the particularities of this type of system is the presence of a term naturally in L^1 in the energy conservation equation, which requires special treatment.This thesis is divided into two parts.The first part is divided into two chapters and is devoted to the study of problems with L^1 data and Neumann-type boundary conditions. To deal with these problems, and with data that are not very regular, we use the framework of renormalized solutions.In the first chapter, we establish a convergence result for solutions approximated by the finite volume method to the unique renormalized solution with zero median in the case of an elliptic convection-diffusion equation. In the second chapter, we focus on a non-linear parabolic problem with non-homogeneous Neumann conditions and a convection term. For this problem, we provide a definition of a renormalized solution and we show the existence and uniqueness of such a solution.The second part is devoted to the study of the system in dimensions 2 and 3. The first chapter deals with the dimension 2 and defines the notion of weak--renormalized solutions. With the help of the existence and stability results established in the first part for the conservation of energy equation, we prove the existence of a weak--renormalized solution.The final chapter considers the trickier case of dimension 3. The absence of a general stability and uniqueness result for the 3-dimensional Navier-Sokes equation requires us to transform the system into a formally equivalent one. By approximation and passage to the limit, we prove the existence of a solution in a weak sense
Parvin, S. "Diffusion-convection problems in parabolic equations". Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382761.
Testo completoLinß, Torsten. "Layer-adapted meshes for convection-diffusion problems". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1203582105872-58676.
Testo completoFranz, Sebastian. "Uniform Error Estimation for Convection-Diffusion Problems". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-133017.
Testo completoLinß, Torsten. "Layer-adapted meshes for convection-diffusion problems". Doctoral thesis, Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A24058.
Testo completoTracey, John. "Stability analyses of multi-component convection-diffusion problems". Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.360157.
Testo completoWu, Wei. "Petrov-Galerkin methods for parabolic convection-diffusion problems". Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670384.
Testo completoLibri sul tema "Problème de Convection-diffusion"
Linß, Torsten. Layer-Adapted Meshes for Reaction-Convection-Diffusion Problems. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-05134-0.
Testo completoAl-Ojaily, S. M. Multigrid/Multi-block algorithm for convection-diffusion problems. Manchester: UMIST, 1997.
Cerca il testo completoLayer-adapted meshes for reaction-convection-diffusion problems. Heidelberg: Springer, 2010.
Cerca il testo completoDafik. A study of multigrid methods with application to convection-diffusion problems. Manchester: UMIST, 1998.
Cerca il testo completoRoos, Hans-Görg. Numerical methods for singularly perturbed differential equations: Convection-diffusion and flow problems. Berlin: Springer-Verlag, 1996.
Cerca il testo completoRüde, Ulrich. Accurate numerical solution of convection-diffusion problems: Final report on Grant I/72342 of Volkswagen Foundation. Novosibirsk: Publishing House of Institute of Mathematics, 2001.
Cerca il testo completoChi-Wang, Shu, e Institute for Computer Applications in Science and Engineering., a cura di. Runge-Kutta discontinuous Galerkin methods for convection-dominated problems. Hampton, VA: ICASE, NASA Langley Research Center, 2000.
Cerca il testo completoCockburn, B. Runge-Kutta discontinuous Galerkin methods for convection-dominated problems. Hampton, VA: ICASE, NASA Langley Research Center, 2000.
Cerca il testo completoMorton, K. W. Numerical Solution of Convection-Diffusion Problems. CRC Press, 2019. http://dx.doi.org/10.1201/9780203711194.
Testo completoMorton, K. W. Numerical Solution of Convection-Diffusion Problems. Chapman & Hall/CRC, 1996.
Cerca il testo completoCapitoli di libri sul tema "Problème de Convection-diffusion"
Linß, Torsten. "Convection-Diffusion Problems". In Layer-Adapted Meshes for Reaction-Convection-Diffusion Problems, 257–307. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-05134-0_9.
Testo completoDolejší, Vít, e Miloslav Feistauer. "DGM for Convection-Diffusion Problems". In Discontinuous Galerkin Method, 117–69. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19267-3_4.
Testo completoVolpert, Vitaly. "Reaction-diffusion Problems with Convection". In Elliptic Partial Differential Equations, 391–451. Basel: Springer Basel, 2014. http://dx.doi.org/10.1007/978-3-0348-0813-2_6.
Testo completoAndreu-Vaillo, Fuensanta, José Mazón, Julio Rossi e J. Julián Toledo-Melero. "A nonlocal convection diffusion problem". In Mathematical Surveys and Monographs, 65–98. Providence, Rhode Island: American Mathematical Society, 2010. http://dx.doi.org/10.1090/surv/165/04.
Testo completoMacMullen, H., E. OŔiordan e G. I. Shishkin. "Schwarz Methods for Convection-Diffusion Problems". In Lecture Notes in Computer Science, 544–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45262-1_64.
Testo completoLinß, Torsten. "Discretisations of Reaction-Convection-Diffusion Problems". In Layer-Adapted Meshes for Reaction-Convection-Diffusion Problems, 183–231. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-05134-0_6.
Testo completoRao, J. S. "Finite Volume Method—Convection-Diffusion Problems". In Simulation Based Engineering in Fluid Flow Design, 99–105. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-46382-7_5.
Testo completoLinß, Torsten. "Reaction-Diffusion Problems". In Layer-Adapted Meshes for Reaction-Convection-Diffusion Problems, 247–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-05134-0_8.
Testo completoKleptsyna, Marina, e Andrey Piatnitski. "Homogenization of Random Nonstationary Convection-Diffusion Problem". In Multiscale Problems in Science and Technology, 251–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-56200-6_11.
Testo completoO’Riordan, E., e J. Quinn. "Multiscale Convection in One Dimensional Singularly Perturbed Convection–Diffusion Problems". In Lecture Notes in Computer Science, 73–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-41515-9_7.
Testo completoAtti di convegni sul tema "Problème de Convection-diffusion"
SAMARSKII, A. A., e P. N. VABISHCHEVICH. "EXPLICIT-IMPLICIT DIFFERENCE SCHEMES FOR CONVECTION-DIFFUSION PROBLEMS". In Proceedings of the Fourth International Conference. WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789814291071_0007.
Testo completoMahmood, Mohammed Shuker, Theodore E. Simos, George Psihoyios e Ch Tsitouras. "Relaxation Characteristics Mixed Algorithm for Nonlinear Convection-Diffusion Problems". In Numerical Analysis and Applied Mathematics. AIP, 2007. http://dx.doi.org/10.1063/1.2790152.
Testo completoChen, Yongguang, e Bing Hu. "Finite element programming for three-dimensional convection diffusion problems". In Education (ICCSE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccse.2010.5593419.
Testo completoBrandner, Marek, e Petr Knobloch. "Some remarks concerning stabilization techniques for convection-diffusion problems". In Programs and Algorithms of Numerical Mathematics 19. Institute of Mathematics, Czech Academy of Sciences, 2019. http://dx.doi.org/10.21136/panm.2018.04.
Testo completoItkina, N. B. "Convection-diffusion problem solving by stabilized finite element methods". In 2012 IEEE 11th International Conference on Actual Problems of Electronics Instrument Engineering (APEIE). IEEE, 2012. http://dx.doi.org/10.1109/apeie.2012.6629058.
Testo completoAKSENOVA, A. E., V. V. CHUDANOV, A. G. CHURBANOV e P. N. VABISHCHEVICH. "A FIXED GRID TECHNIQUE FOR CONVECTION-DIFFUSION PHASE CHANGE PROBLEMS". In Proceedings of the Fourth International Conference. WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789814291071_0083.
Testo completoRuas, V., A. C. P. Brasil Junior, Theodore E. Simos, George Psihoyios e Ch Tsitouras. "A Stable Explicit Method for Time-Dependent Convection-Diffusion Problems". In Numerical Analysis and Applied Mathematics. AIP, 2007. http://dx.doi.org/10.1063/1.2790184.
Testo completoSarbu, Gheorghe, e Constantin Popa. "On numerical solution of nonlinear parabolic multicomponent convection-diffusion problems". In RAD Conference. RAD Centre, 2021. http://dx.doi.org/10.21175/rad.abstr.book.2021.10.3.
Testo completoBui, T. T., e V. Popov. "The radial basis integral equation method for convection-diffusion problems". In BEM/MRM 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/be090091.
Testo completoZhou, Xiafeng, e Fu Li. "Research on Nodal Expansion Method for Transient Convection Diffusion Equation". In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30074.
Testo completoRapporti di organizzazioni sul tema "Problème de Convection-diffusion"
Buerger, Raimund, e Kenneth H. Karlsen. A Strongly Degenerate Convection-Diffusion Problem Modeling Centrifugation of Flocculated Suspensions. Fort Belvoir, VA: Defense Technical Information Center, giugno 2000. http://dx.doi.org/10.21236/ada397140.
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