{"id":363914,"date":"2024-04-24T10:44:02","date_gmt":"2024-04-24T10:44:02","guid":{"rendered":"\/forum\/forums\/topic\/to-implement-the-transport-convection-diffusion-equation-by-udf\/"},"modified":"2024-05-02T05:45:31","modified_gmt":"2024-05-02T05:45:31","slug":"to-implement-the-transport-convection-diffusion-equation-by-udf","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/to-implement-the-transport-convection-diffusion-equation-by-udf\/","title":{"rendered":"To implement the transport (convection-diffusion) equation by UDF"},"content":{"rendered":"<div>Hi, everybody.<br \/>I&#8217;m doing: particles transport is modeled by a convection-diffusion equation in ansys fluent 2023R2.<br \/>&#8211; steady-state model.<\/div>\n<div>&#8211; multiphase model: Eulerian.<\/div>\n<div>-Primary phase material: Newtonian.<\/div>\n<div>-second phase material: non-Newtonian.<\/div>\n<div>I am very confused when implementing the convection-diffusion equation using UDF.<\/div>\n<div>I did it using 2 methods after read section 1.3. User-Defined Scalar (UDS) Transport Equations in Ansys Fluent Theory Guide.<br \/>method 1:define UDSI by DEFINE_ADJUST and diffusion coefficient by DEFINE_DIFFUSIVITY<\/p>\n<p>Method 2: implement fully equation by DEFINE DIFFUSIVITY.<\/p>\n<p>I don&#8217;t know what is the most accurate way to describe the equation.<\/p><\/div>\n<div><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/24-04-2024-1713954689-Capture.PNG\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/24-04-2024-1713954689-Capture.PNG\" alt=\"\"><\/a><\/div>\n<div>I am looking forward help from experts and knowledgeable users<br \/>Thanks you so much!!!<\/div>\n","protected":false},"template":"","class_list":["post-363914","topic","type-topic","status-closed","hentry","topic-tag-multiphase_models-1","topic-tag-diffusion","topic-tag-scalartransport-1","topic-tag-udf"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["65757","199"],"_bbp_author_ip":["168.143.243.24"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["538"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1714628711:245014"],"_bbp_topic_id":["363914"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","65757"],"_bbp_voice_count":["2"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["364379"],"_bbp_last_active_id":["364379"],"_bbp_last_active_time":["2024-04-26 11:30:36"]},"test":"chuminhkhuehanyang-ac-kr"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/363914","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/363914\/revisions"}],"predecessor-version":[{"id":365125,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/363914\/revisions\/365125"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=363914"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}