{"id":429455,"date":"2025-04-20T14:56:04","date_gmt":"2025-04-20T14:56:04","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/implementing-python-udf-in-fluent-2025-r1\/"},"modified":"2025-04-20T14:56:04","modified_gmt":"2025-04-20T14:56:04","slug":"implementing-python-udf-in-fluent-2025-r1","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/implementing-python-udf-in-fluent-2025-r1\/","title":{"rendered":"Implementing Python UDF in Fluent 2025 R1"},"content":{"rendered":"<p>&lt;p&gt;Hi,&nbsp;&lt;\/p&gt;&lt;p&gt;I have a question regarding writing and implementing UDFs for Fluent in Python. I understand that it is only available in the Beta Feature in 2025R1. But I have a hard time implementing them.&nbsp;&lt;\/p&gt;&lt;p&gt;The Link (<a href=\"https:\/\/ansyshelp.ansys.com\/public\/account\/secured?returnurl=\/Views\/Secured\/corp\/v251\/en\/fluent_beta_doc\/flu_beta_gpgpu_solver_supp_features.html\">33.1. Fluent GPU Solver Beta Features<\/a>) explains how to implement them and since they are in beta version, you can only use TUI command. I used this command (&lt;\/p&gt;<\/p>\n<pre class=\"screen\">(rpsetvar 'gpuapp\/python-udf-files '(\"myudf.py\"))<\/pre>\n<p>&lt;p&gt;) with my UDF. I think the scheme command hooks my UDF, but the UDF is never implemented during iteration. With the above command, I don&#8217;t encounter any errors either. So, I think there is no error in UDF.py. But Fluent silently ignores the UDF?&lt;\/p&gt;&lt;p&gt;In addition, I observed that only a handful of functions are currently available in Python UDF (Table 33.5: Supported Hookup Functions). I cannot seem to find any relevant function which is equivalent to DEFINE_NET_REACTION_RATE (name, c, t, particle, pressure, temp, yi, rr, jac) in C UDFs.&nbsp;&lt;\/p&gt;&lt;p&gt;If anyone has experience in handling the above two issues, please let me know.&nbsp;&lt;\/p&gt;&lt;p&gt;Any suggestion is highly helpful. :)&lt;\/p&gt;&lt;p&gt;Thank you!&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-429455","topic","type-topic","status-publish","hentry","topic-tag-python","topic-tag-python-scripts-2","topic-tag-udf-in-fluent"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["429455"],"_bbp_subscription":["494013","199"],"_bbp_author_ip":["31.207.21.193"],"_bbp_last_reply_id":["429703"],"_bbp_last_active_id":["429703"],"_bbp_last_active_time":["2025-04-23 09:12:16"],"_bbp_reply_count":["4"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["494013","199"],"_btv_view_count":["361"],"_bbp_topic_status":["unanswered"]},"test":"s-sethuramandejong-nl"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/429455","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\/429455\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=429455"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}