{"id":363630,"date":"2024-04-23T06:43:47","date_gmt":"2024-04-23T06:43:47","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=363630"},"modified":"2024-04-23T06:43:47","modified_gmt":"2024-04-23T06:43:47","slug":"soot_moss-brookes_udf-option-for-nucleation-does-not-work","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/soot_moss-brookes_udf-option-for-nucleation-does-not-work\/","title":{"rendered":"Soot_Moss-Brookes_UDF option for nucleation does not work"},"content":{"rendered":"<p class=\"MsoNormal\"><span style=\"font-family: 'Arial',sans-serif\">Hello,<\/span><span style=\"font-family: 'Arial',sans-serif\">&nbsp;<\/span><\/p>\n<p class=\"MsoNormal\"><span style=\"font-family: 'Arial',sans-serif\">I&#8217;m currently utilizing the Moss-Brookes model within the species model framework for predicting soot. While the model performs adequately, I&#8217;m interested in incorporating my own nucleation rate using the User-Defined Function (UDF) option provided by the Moss-Brookes model. Despite implementing the UDF template exactly as provided in the UDF manual (https:\/\/ansyshelp.ansys.com\/Views\/Secured\/corp\/v231\/en\/flu_udf\/flu_udf_ModelSpecificDEFINE.html#flu_udf_sec_define_soot_nuclei), it appears that the Fluent solver is disregarding it. Even when I modify values or add print commands within the UDF file, there&#8217;s no observable change in the nucleation rate or any output in the console.<\/span><span> <\/span><\/p>\n<p class=\"MsoNormal\"><span style=\"font-family: 'Arial',sans-serif\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/23-04-2024-1713854385-mceclip0.png\"><\/span><\/p>\n<p class=\"MsoNormal\"><span style=\"font-family: 'Arial',sans-serif\">It&#8217;s worth noting that when I utilize the soot oxidation model within the model settings, using the template in the UDF manual for soot oxidation rate (https:\/\/ansyshelp.ansys.com\/Views\/Secured\/corp\/v231\/en\/flu_udf\/flu_udf_ModelSpecificDEFINE.html#flu_udf_sec_define_soot_oxidation), it operates as expected showing that compiling process is fine! However, as I mentioned earlier the user-defined soot nuclei rates or user-defined soot mass rate seem to be ineffective! Has anyone successfully employed this option (User Defined Functions) before? Is there something crucial that I might have overlooked?<\/span><\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n<p class=\"MsoNormal\"><span style=\"font-family: 'Arial',sans-serif\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/23-04-2024-1713854436-mceclip1.png\"><\/span><\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n<p class=\"MsoNormal\"><span style=\"font-family: 'Arial',sans-serif\">I&#8217;d greatly appreciate any insights or assistance regarding this matter.<\/span><\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-363630","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["96.7.218.223"],"_bbp_subscription":["252677","23673"],"_btv_view_count":["213"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["363630"],"_bbp_forum_id":["27792"],"_bbp_engagement":["23673","252677"],"_bbp_voice_count":["2"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["366132"],"_bbp_last_active_id":["366132"],"_bbp_last_active_time":["2024-05-08 15:29:52"]},"test":"afakharnezhastudent-unimelb-edu-au"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/363630","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\/363630\/revisions"}],"predecessor-version":[{"id":363648,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/363630\/revisions\/363648"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=363630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}