# symetric boundary conditions for diffusion_convect

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 February 1, 2002, 16:27 symetric boundary conditions for diffusion_convect #1 mehdi icho Guest   Posts: n/a hello Everyone I have a simple CFD problem. But i am just a begginer in this field. It is a diffusion-convection problem. consider a series of injector (In) on y axis and a a uniform V flow coming from the infinite. and I have to solve the unsteady diffusion-convection equation within the rectangular domain ABCD. all the injectors have the same length b. and AB cross the middle of In, and CD cross the middle of the distance between In and In+1. on the section AD we have the entry condition =0 except on the injector which is Co. on sections AB and CD we have a symetric condition. on section CB we have outlet condition. my problem is that I do not know how to know the expression of the boundary condition on AB,CD and DB. Thank you for your helps. a scheme description In-2 -------> V In-1 V -------> A B In-------------------------- | | | | D -------------------------- C ----------------------------------> x In+1 V -------> In+2

 February 2, 2002, 12:29 Re: symetric boundary conditions for diffusion_con #2 mehdi icho Guest   Posts: n/a the flow V is on X axis

 February 2, 2002, 12:47 Re: symetric boundary conditions for diffusion_con #3 mehdi icho Guest   Posts: n/a salut tout le monde je repose mon probleme en français. on suppose une série infini d'injecteurs In placés sur l'axe des y, un écoulement uniforme horizontal (sur l'axe des x) provient de moins l'infini. on se limite à un domaine rectangulaire ABCD où A est le milieu de l'injecteur In, D est le milieu du segement séparant l'injecteur In et In+1. BC représente la frontière est. AB est la frontière sud et DC la frontière nord. on désire modéliser l'équation d'advection-diffusion instationnaire. on suppose que la concentration est de Co sur l'injecteur et 0 sur toute la face ouest. Sur la frontière est on a une condition de sortie. Sur les frontières nord et sud une condition de symètrie. j'ai envie de modéliser celà en volume finies, mais je n'arrive pas à exprimer mathématiquement les conditions de symétrie en AB et DC et la condition de sortie en BC. merci de m'aider

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