{"id":866,"date":"2013-02-18T20:16:01","date_gmt":"2013-02-18T20:16:01","guid":{"rendered":"http:\/\/ellignostage.test\/?p=866"},"modified":"2021-05-26T13:12:56","modified_gmt":"2021-05-26T18:12:56","slug":"elligno-inc","status":"publish","type":"post","link":"https:\/\/elligno.com\/fr\/elligno-inc\/","title":{"rendered":"Elligno Inc."},"content":{"rendered":"\n

Architecte Logiciel\/ Programmeur Scientifique (Scientific Simulation Framework)<\/b><\/span><\/p>\n\n\n\n

Project<\/b>: Depuis les 5 derni\u00e8res ann\u00e9es nous travaillons sur un projet de recherche et d\u00e9veloppement en mod\u00e9lisation physique. Le but est de construire un environnement de programmation de type framework pour la mod\u00e9lisation physique, permettrait de prototyper rapidement des simulateurs physique. Nous utilisons les concepts d’Orient\u00e9e-Objet Num\u00e9rique et les concepts de plug-in (logiciel est organis\u00e9 en librairies), le principal avantage de cette approche, est la flexibilit\u00e9 dans la programmation d’algorithme et de solveur math\u00e9matique. Ceci permet d’acc\u00e9l\u00e9rer l’\u00e9tape de prototypage. Pr\u00e9sentement la principale application est dans le domaine de la simulation des \u00e9coulements \u00e0 ciel ouvert (application industrielle dans la production hydro-\u00e9lectrique). Dans ce domaine on veut souvent tester ou valider des algorithmes rapidement sur le probl\u00e8me du bris de barrage (plug-in appel\u00e9 Dam Break++). Le Framework contient \u00e9galement une librairie de math\u00e9matique 3D qui est optimis\u00e9 pour les op\u00e9rations \u00e0 virgule flottante. Finalement, en cours d\u00e9veloppement, une librairie physique 3D pour la mod\u00e9lisation (simulation) de corps rigide (physique 3D). Finalement un GUI est fourni avec le Framework afin d’aider \u00e0 debugger et \u00e0 visualiser les r\u00e9sultats de simulation.<\/span><\/p>\n\n\n\n

R\u00e9sultat<\/b><\/p>\n\n\n\n

Mod\u00e9lisation de la Propagation d’une Onde de choc<\/b><\/p>\n\n\n\n

Un sch\u00e9ma semi-discret au deuxi\u00e8me ordre en temps et en espace (mod\u00e8le aux volumes finis) bas\u00e9 sur une discr\u00e9tisation aux diff\u00e9rences finies est utilis\u00e9 pour r\u00e9soudre les \u00e9quations de Shallow-water. Le mod\u00e8le avance par \u00ab pas \u00bb de temps selon un solveur de Runge-Kutta qui utilise une m\u00e9thode pr\u00e9dicteur-correcteur. Les flux num\u00e9riques sont calcul\u00e9s par un solveur de Riemann de type HLL (Harten-Lax-van Leer). Un sch\u00e9ma simple TVD est employ\u00e9 pour la m\u00e9thode de capture de choc et une fonction de flux \u00abMinmod limiter\u00bb est utilis\u00e9e. Dans la figure ci-dessous nous voyons les profils de la propagation de l’onde de choc. La solution num\u00e9rique est compar\u00e9e avec les r\u00e9sultats analytiques. Les erreurs de la solution analytique sont estim\u00e9es et pr\u00e9sent\u00e9es.<\/p>\n\n\n\n

\"eligno1\"\/<\/figure>\n\n\n\n

Image fichier : HLLScheme.jpg<\/b><\/p>\n\n\n\n

 <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

Mod\u00e9lisation physique (m\u00e9canique des fluides) dans le domaine des \u00e9coulements \u00e0 ciel ouvert, application dans le domaine hydro-\u00e9lectrique. Architecture logicielle Orient\u00e9e-Objet pour le prototypage rapide de simulateur physique (simulation num\u00e9rique) qui permet de prototyper rapidement et de valider sur le probl\u00e8me du bris de barrage.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[],"class_list":["post-866","post","type-post","status-publish","format-standard","hentry","category-projets"],"yoast_head":"\nElligno Inc. - Elligno<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/elligno.com\/fr\/elligno-inc\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Elligno Inc. - Elligno\" \/>\n<meta property=\"og:description\" content=\"Mod\u00e9lisation physique (m\u00e9canique des fluides) dans le domaine des \u00e9coulements \u00e0 ciel ouvert, application dans le domaine hydro-\u00e9lectrique. 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