{"id":160080,"date":"2021-07-04T15:52:17","date_gmt":"2021-07-04T15:52:17","guid":{"rendered":"\/forum\/forums\/topic\/can-binary-diffusion-coefficients-be-somehow-defined-as-a-function-of-two-parameters\/"},"modified":"2021-07-21T18:59:49","modified_gmt":"2021-07-21T18:59:49","slug":"can-binary-diffusion-coefficients-be-somehow-defined-as-a-function-of-two-parameters","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/can-binary-diffusion-coefficients-be-somehow-defined-as-a-function-of-two-parameters\/","title":{"rendered":"Can binary diffusion coefficients be somehow defined as a function of two parameters?"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>I am modeling 11-species air mixture. And I have to define binary diffusion coefficients for full multicomponent diffusion. The only instrument that is given by fluent is polynomial approximation of temperature dependence. But for ionic species binary coefficients depends also from electrons gas pressure. Can I somehow take this dependence into account through UDF, or any other way? Why isn&#039;t it possible to set binary coefficients as udfs like species viscosity and thermal conductivity? DEFINE_DIFFUSIVITY works as I understand only for Fickian diffusion model because it depends only from one species index.<\/p>\n","protected":false},"template":"","class_list":["post-160080","topic","type-topic","status-closed","hentry","topic-tag-diffusion","topic-tag-mass-diffusivity-1","topic-tag-species-diffusion"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I am modeling 11-species air mixture. And I have to define binary diffusion coefficients for full multicomponent diffusion. The only instrument that is given by fluent is polynomial approximation of temperature dependence. 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