{"id":456828,"date":"2026-04-21T11:35:10","date_gmt":"2026-04-21T11:35:10","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-shuts-down-without-error-message-when-using-udf-during-initialization\/"},"modified":"2026-04-21T11:35:10","modified_gmt":"2026-04-21T11:35:10","slug":"fluent-shuts-down-without-error-message-when-using-udf-during-initialization","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-shuts-down-without-error-message-when-using-udf-during-initialization\/","title":{"rendered":"Fluent Shuts Down Without Error Message When Using UDF During Initialization"},"content":{"rendered":"<p>&lt;h5&gt;I am using a Cross-WLF viscosity UDF in ANSYS Fluent. The UDF compiles and loads successfully without any errors. However, when I apply the UDF to the material viscosity and then perform Initialization or start the Calculation, Fluent suddenly shuts down without displaying any error message or warning code.&lt;\/h5&gt;&lt;h5&gt;There is no crash report or explicit error log shown in the Fluent console. The application simply closes during initialization or while starting the solver.&lt;\/h5&gt;&lt;h5&gt;I would like to know the possible causes of this issue and how to troubleshoot it.&lt;\/h5&gt;&lt;h5 id=&#8221;tw-target-text&#8221; class=&#8221;tw-data-text tw-text-large tw-ta&#8221; dir=&#8221;ltr&#8221; tabindex=&#8221;-1&#8243; role=&#8221;text&#8221; data-placeholder=&#8221;\ubc88\uc5ed&#8221; data-ved=&#8221;2ahUKEwjProqi7P6TAxX3m68BHTi3Jr0Q3ewLegQICBAV&#8221; aria-label=&#8221;\ubc88\uc5ed\ub41c \ud14d\uc2a4\ud2b8: The version is Ansys 2021 R1.&#8221;&gt;&lt;span class=&#8221;Y2IQFc&#8221; lang=&#8221;en&#8221;&gt;The version is Ansys 2021 R1.&lt;\/span&gt;&lt;\/h5&gt;<\/p>\n","protected":false},"template":"","class_list":["post-456828","topic","type-topic","status-publish","hentry","topic-tag-fluent","topic-tag-udf"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["456828"],"_bbp_author_ip":["165.132.125.207"],"_bbp_last_reply_id":["456833"],"_bbp_last_active_id":["456833"],"_bbp_last_active_time":["2026-04-21 12:39:15"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["678558","199"],"_btv_view_count":["69"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["199"]},"test":"hyn424naver-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/456828","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\/456828\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=456828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}