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Artykuły w czasopismach na temat "Problème de Convection-diffusion"
Gaultier, Maurice, i Mikel Lezaun. "Un problème de convection-diffusion avec réaction chimique". Comptes Rendus de l'Académie des Sciences - Series I - Mathematics 324, nr 2 (styczeń 1997): 159–64. http://dx.doi.org/10.1016/s0764-4442(99)80336-x.
Pełny tekst źródłaBen-Abdallah, Philippe, Hamou Sadat i Vital Le Dez. "Résolution d'un problème inverse de convection–diffusion par une méthode de perturbation singulière". International Journal of Thermal Sciences 39, nr 7 (lipiec 2000): 742–52. http://dx.doi.org/10.1016/s1290-0729(00)00279-9.
Pełny tekst źródłaDalík, Josef. "A Petrov-Galerkin approximation of convection-diffusion and reaction-diffusion problems". Applications of Mathematics 36, nr 5 (1991): 329–54. http://dx.doi.org/10.21136/am.1991.104471.
Pełny tekst źródłaMartynova, T. S., G. V. Muratova, I. N. Shabas i 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), nr 1 (31.01.2022): 46–59. http://dx.doi.org/10.26089/nummet.v23r104.
Pełny tekst źródłaDalík, Josef, i Helena Růžičková. "An explicit modified method of characteristics for the one-dimensional nonstationary convection-diffusion problem with dominating convection". Applications of Mathematics 40, nr 5 (1995): 367–80. http://dx.doi.org/10.21136/am.1995.134300.
Pełny tekst źródłaDolejší, V., M. Feistauer i C. Schwab. "On discontinuous Galerkin methods for nonlinear convection-diffusion problems and compressible flow". Mathematica Bohemica 127, nr 2 (2002): 163–79. http://dx.doi.org/10.21136/mb.2002.134171.
Pełny tekst źródłaGoldstein, C. I. "Preconditioning convection dominated convection‐diffusion problems". International Journal of Numerical Methods for Heat & Fluid Flow 5, nr 2 (luty 1995): 99–119. http://dx.doi.org/10.1108/eum0000000004059.
Pełny tekst źródłaStynes, Martin. "Steady-state convection-diffusion problems". Acta Numerica 14 (19.04.2005): 445–508. http://dx.doi.org/10.1017/s0962492904000261.
Pełny tekst źródłaKashyap, Pradeep. "Convection Diffusion Problems Solved by Fractional Variational Iteration Method". RESEARCH HUB International Multidisciplinary Research Journal 9, nr 3 (23.03.2022): 01–07. http://dx.doi.org/10.53573/rhimrj.2022.v09i03.001.
Pełny tekst źródłaRoos, Hans-Görg, i Martin Stynes. "Necessary conditions for uniform convergence of finite difference schemes for convection-diffusion problems with exponential and parabolic layers". Applications of Mathematics 41, nr 4 (1996): 269–80. http://dx.doi.org/10.21136/am.1996.134326.
Pełny tekst źródłaRozprawy doktorskie na temat "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.
Pełny tekst źródłaCollective 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/.
Pełny tekst źródłaThis 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.
Pełny tekst źródłaAoun, Mirella. "Analyse et analyse numérique d'EDP issues de la thermomécanique des fluides". Electronic Thesis or Diss., Normandie, 2023. http://www.theses.fr/2023NORMR093.
Pełny tekst źródłaIn 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.
Pełny tekst źródłaLinß, 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.
Pełny tekst źródłaFranz, 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.
Pełny tekst źródłaLinß, Torsten. "Layer-adapted meshes for convection-diffusion problems". Doctoral thesis, Technische Universität Dresden, 2006. https://tud.qucosa.de/id/qucosa%3A24058.
Pełny tekst źródłaTracey, 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.
Pełny tekst źródłaWu, 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.
Pełny tekst źródłaKsiążki na temat "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.
Pełny tekst źródłaAl-Ojaily, S. M. Multigrid/Multi-block algorithm for convection-diffusion problems. Manchester: UMIST, 1997.
Znajdź pełny tekst źródłaLinss, Torsten. Layer-adapted meshes for reaction-convection-diffusion problems. Heidelberg: Springer, 2010.
Znajdź pełny tekst źródłaDafik. A study of multigrid methods with application to convection-diffusion problems. Manchester: UMIST, 1998.
Znajdź pełny tekst źródłaRoos, Hans-Görg. Numerical methods for singularly perturbed differential equations: Convection-diffusion and flow problems. Berlin: Springer-Verlag, 1996.
Znajdź pełny tekst źródłaRüde, 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.
Znajdź pełny tekst źródłaChi-Wang, Shu, i Institute for Computer Applications in Science and Engineering., red. Runge-Kutta discontinuous Galerkin methods for convection-dominated problems. Hampton, VA: ICASE, NASA Langley Research Center, 2000.
Znajdź pełny tekst źródłaCockburn, B. Runge-Kutta discontinuous Galerkin methods for convection-dominated problems. Hampton, VA: ICASE, NASA Langley Research Center, 2000.
Znajdź pełny tekst źródłaMorton, K. W. Numerical Solution of Convection-Diffusion Problems. CRC Press, 2019. http://dx.doi.org/10.1201/9780203711194.
Pełny tekst źródłaMorton, K. W. Numerical Solution of Convection-Diffusion Problems. Chapman & Hall/CRC, 1996.
Znajdź pełny tekst źródłaCzęści książek na temat "Problème de Convection-diffusion"
Linß, Torsten. "Convection-Diffusion Problems". W 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.
Pełny tekst źródłaDolejší, Vít, i Miloslav Feistauer. "DGM for Convection-Diffusion Problems". W Discontinuous Galerkin Method, 117–69. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19267-3_4.
Pełny tekst źródłaVolpert, Vitaly. "Reaction-diffusion Problems with Convection". W Elliptic Partial Differential Equations, 391–451. Basel: Springer Basel, 2014. http://dx.doi.org/10.1007/978-3-0348-0813-2_6.
Pełny tekst źródłaAndreu-Vaillo, Fuensanta, José Mazón, Julio Rossi i J. Julián Toledo-Melero. "A nonlocal convection diffusion problem". W Mathematical Surveys and Monographs, 65–98. Providence, Rhode Island: American Mathematical Society, 2010. http://dx.doi.org/10.1090/surv/165/04.
Pełny tekst źródłaMacMullen, H., E. OŔiordan i G. I. Shishkin. "Schwarz Methods for Convection-Diffusion Problems". W Lecture Notes in Computer Science, 544–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45262-1_64.
Pełny tekst źródłaLinß, Torsten. "Discretisations of Reaction-Convection-Diffusion Problems". W 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.
Pełny tekst źródłaRao, J. S. "Finite Volume Method—Convection-Diffusion Problems". W 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.
Pełny tekst źródłaLinß, Torsten. "Reaction-Diffusion Problems". W 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.
Pełny tekst źródłaKleptsyna, Marina, i Andrey Piatnitski. "Homogenization of Random Nonstationary Convection-Diffusion Problem". W 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.
Pełny tekst źródłaO’Riordan, E., i J. Quinn. "Multiscale Convection in One Dimensional Singularly Perturbed Convection–Diffusion Problems". W 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.
Pełny tekst źródłaStreszczenia konferencji na temat "Problème de Convection-diffusion"
SAMARSKII, A. A., i P. N. VABISHCHEVICH. "EXPLICIT-IMPLICIT DIFFERENCE SCHEMES FOR CONVECTION-DIFFUSION PROBLEMS". W Proceedings of the Fourth International Conference. WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789814291071_0007.
Pełny tekst źródłaMahmood, Mohammed Shuker, Theodore E. Simos, George Psihoyios i Ch Tsitouras. "Relaxation Characteristics Mixed Algorithm for Nonlinear Convection-Diffusion Problems". W Numerical Analysis and Applied Mathematics. AIP, 2007. http://dx.doi.org/10.1063/1.2790152.
Pełny tekst źródłaChen, Yongguang, i Bing Hu. "Finite element programming for three-dimensional convection diffusion problems". W Education (ICCSE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccse.2010.5593419.
Pełny tekst źródłaBrandner, Marek, i Petr Knobloch. "Some remarks concerning stabilization techniques for convection-diffusion problems". W Programs and Algorithms of Numerical Mathematics 19. Institute of Mathematics, Czech Academy of Sciences, 2019. http://dx.doi.org/10.21136/panm.2018.04.
Pełny tekst źródłaItkina, N. B. "Convection-diffusion problem solving by stabilized finite element methods". W 2012 IEEE 11th International Conference on Actual Problems of Electronics Instrument Engineering (APEIE). IEEE, 2012. http://dx.doi.org/10.1109/apeie.2012.6629058.
Pełny tekst źródłaAKSENOVA, A. E., V. V. CHUDANOV, A. G. CHURBANOV i P. N. VABISHCHEVICH. "A FIXED GRID TECHNIQUE FOR CONVECTION-DIFFUSION PHASE CHANGE PROBLEMS". W Proceedings of the Fourth International Conference. WORLD SCIENTIFIC, 1999. http://dx.doi.org/10.1142/9789814291071_0083.
Pełny tekst źródłaRuas, V., A. C. P. Brasil Junior, Theodore E. Simos, George Psihoyios i Ch Tsitouras. "A Stable Explicit Method for Time-Dependent Convection-Diffusion Problems". W Numerical Analysis and Applied Mathematics. AIP, 2007. http://dx.doi.org/10.1063/1.2790184.
Pełny tekst źródłaSarbu, Gheorghe, i Constantin Popa. "On numerical solution of nonlinear parabolic multicomponent convection-diffusion problems". W RAD Conference. RAD Centre, 2021. http://dx.doi.org/10.21175/rad.abstr.book.2021.10.3.
Pełny tekst źródłaBui, T. T., i V. Popov. "The radial basis integral equation method for convection-diffusion problems". W BEM/MRM 2009. Southampton, UK: WIT Press, 2009. http://dx.doi.org/10.2495/be090091.
Pełny tekst źródłaZhou, Xiafeng, i Fu Li. "Research on Nodal Expansion Method for Transient Convection Diffusion Equation". W 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30074.
Pełny tekst źródłaRaporty organizacyjne na temat "Problème de Convection-diffusion"
Buerger, Raimund, i Kenneth H. Karlsen. A Strongly Degenerate Convection-Diffusion Problem Modeling Centrifugation of Flocculated Suspensions. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 2000. http://dx.doi.org/10.21236/ada397140.
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