%A"Nuyen, Luong Than [Commissariat a l'Energie Atomique, Saclay (France). Centre d'Etudes Nucleaires]" %D1965 %I; CEA Saclay, 91 - Gif-sur-Yvette (France); Ecole Nationale Superieure de l'Aeronautique, 31 - Toulouse (France) %2 %J[] %K71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS, BOUNDARY CONDITIONS, CONVERGENCE, DIFFUSION EQUATIONS, FINITE DIFFERENCE METHOD, MESH GENERATION, TWO-DIMENSIONAL CALCULATIONS %PMedium: ED; Size: 123 pages %TSolution of the diffusion equation (2 dimensions, several media, arbitrary boundary); Resolution de l'equation de diffusion (deux dimensions, plusieurs regions, contours quelconques) %XQuite often practical problems involve relatively complicated geometrical shapes and several very different media. The discretization technique used here (variable mesh spacings) has the following advantages: it enables one to approximate curved contours more easily, to distribute the mesh points more economically and to smooth out discontinuities due to two very different media (danger of poor convergence). The method of programming by subroutines makes available to engineers and scientists who are not well acquainted with numerical analysis, a simple and foolproof iterative method: it suffices to pass by all the mesh points and to call the corresponding subroutine each time. (author) [French] Un probleme pratique est souvent caracterise par une geometrie non simple et des milieux tres differents. La technique de maillage utilisee (pas variable) permet d'approximer plus aisement les contours courbes, de repartir economiquement les points et de regulariser les discontinuites dues a deux milieux tres differents (difficulte de convergence). La technique de programmation par sous-programmes met a la disposition des ingenieurs non specialises dans le domaine numerique une methode iterative simple et sure: il suffit de passer tous les points en revue et d'appeler a chaque fois le sous-programme correspondant. (auteur) %0Thesis/Dissertation %NCEA-R-2867;TRN: FR05R2867035907 %1 %CFrance %Rhttps://doi.org/ TRN: FR05R2867035907 FRN %GEnglish; French