{"id":276558,"date":"2023-03-27T10:41:09","date_gmt":"2023-03-27T10:41:09","guid":{"rendered":"\/forum\/forums\/topic\/dpm-udf-how-to-define-the-concentration-in-the-particle-and-the-medium\/"},"modified":"2023-03-27T10:41:09","modified_gmt":"2023-03-27T10:41:09","slug":"dpm-udf-how-to-define-the-concentration-in-the-particle-and-the-medium","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/dpm-udf-how-to-define-the-concentration-in-the-particle-and-the-medium\/","title":{"rendered":"DPM UDF &#8211; How to define the concentration in the particle and the medium?"},"content":{"rendered":"<p>I am trying to build a UDF that models the mass transfer between the particles (DPM model) and the surrounding medium. For that purpose, I need to define as variables the medium density and the concentration of a certain species in the particle and the surrounding medium. What are the appropriate macros to do so? I am trying with:<\/p>\n<p style=\"padding-left: 40px\">Medium density: <em>C_R (c, t)<\/em><br \/>Species concentration in the medium: <em>C_YI (c, t, 0)<\/em><br \/>Species concentration in the particle: <em>TP_COMPONENT_I (tp, 0)<\/em><\/p>\n<p>Is this correct?<\/p>\n<p>Then, how should I define the thread <em>t<\/em> in the case of the medium? This is giving me some problems. I have tried to use <em>t<\/em>, defined as <em>Thread * t = TP_CELL_THREAD(tp)<\/em>, but Fluent points out that the index is not valid for <em>C_R<\/em> and <em>C_YI<\/em>.&nbsp;<\/p>\n<p>I have seen in an example in the User&rsquo;s Guide the following definition: <em>Material *gas_mix = THREAD_MATERIAL(DPM_THREAD(t0, tp))<\/em>, but I cannot understand its meaning and utility. Could anybody clarify it?<\/p>\n<p>Any reply will be appreciated. Thank you in advance!<\/p>\n","protected":false},"template":"","class_list":["post-276558","topic","type-topic","status-closed","hentry","topic-tag-dpm","topic-tag-udf"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["80509","199"],"_bbp_author_ip":["23.223.149.174"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["580"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["276558"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","80509"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["276652"],"_bbp_last_active_id":["276652"],"_bbp_last_active_time":["2023-03-27 15:47:47"]},"test":"gloria-gonzalezunican-es"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/276558","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":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/276558\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=276558"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}