{"id":458396,"date":"2026-05-18T21:47:07","date_gmt":"2026-05-18T21:47:07","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/wind-flow-effect-on-coal-combustion\/"},"modified":"2026-05-18T21:47:07","modified_gmt":"2026-05-18T21:47:07","slug":"wind-flow-effect-on-coal-combustion","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/wind-flow-effect-on-coal-combustion\/","title":{"rendered":"Wind flow effect on coal combustion."},"content":{"rendered":"<p>&lt;p&gt;Hi everyone,&lt;\/p&gt;&lt;p&gt;I am working on a simulation to analyze the effect of wind flow on coal combustion. My setup requires a non-equilibrium thermal model and includes oxidation reactions that generate \\text{CO}_2, \\text{CO}, and heat.&lt;\/p&gt;&lt;p&gt;To achieve this, I implemented the governing equations via a User-Defined Function (UDF). I successfully compiled the UDF using Fluent&#8217;s built-in compiler and hooked the functions to their respective zones\/models perfectly.&lt;\/p&gt;&lt;p&gt;However, when I run the simulation, I cannot see any effect from the UDF. The results look as if the UDF is not being executed at all.&lt;\/p&gt;&lt;p&gt;Has anyone encountered a similar issue where a successfully compiled and hooked UDF does not influence the flow field or species generation? Any guidance on how to debug this or what I might be missing would be greatly appreciated.&lt;\/p&gt;&lt;p&gt;Thank you in advance for your help!&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-458396","topic","type-topic","status-publish","hentry","topic-tag-udf"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["458396"],"_bbp_subscription":["477373","199"],"_bbp_author_ip":["103.148.108.225"],"_bbp_last_reply_id":["458444"],"_bbp_last_active_id":["458444"],"_bbp_last_active_time":["2026-05-19 12:32:53"],"_bbp_reply_count":["5"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["477373","199"],"_btv_view_count":["32"],"_bbp_topic_status":["unanswered"]},"test":"adib-aktab999gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/458396","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\/458396\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=458396"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}