{"id":439511,"date":"2025-08-18T06:45:22","date_gmt":"2025-08-18T06:45:22","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-apply-outlet-profile-as-inlet-in-transient-fluent-simulation\/"},"modified":"2025-08-18T06:45:22","modified_gmt":"2025-08-18T06:45:22","slug":"how-to-apply-outlet-profile-as-inlet-in-transient-fluent-simulation","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-apply-outlet-profile-as-inlet-in-transient-fluent-simulation\/","title":{"rendered":"How to apply outlet profile as inlet in transient Fluent simulation"},"content":{"rendered":"

<p data-start=”283″ data-end=”504″>I am currently working on a CFD project using Ansys Fluent 2025 R1. My goal is to apply the <strong data-start=”371″ data-end=”501″>outlet flow field from a long straight pipe simulation as the inlet boundary condition for a subsequent curved pipe simulation<\/strong>.<\/p><ul data-start=”506″ data-end=”808″><li data-start=”506″ data-end=”657″><p data-start=”508″ data-end=”657″>For steady-state cases, I have successfully exported the outlet velocity profile and then applied it as the inlet condition of the curved pipe.<\/p><\/li>\n

<li data-start=”658″ data-end=”808″><p data-start=”660″ data-end=”808″>However, in the transient case, I am struggling to find the proper way to transfer the time-dependent outlet flow field to the inlet boundary.<\/p><\/li>\n<\/ul>\n

<p data-start=”810″ data-end=”834″>My main questions are:<\/p><\/p>\n

    <li data-start=”835″ data-end=”945″><p data-start=”838″ data-end=”945″>How can I extract the transient outlet flow field (velocity\/pressure vs. time) from the first simulation?<\/p><\/li>\n

    <li data-start=”946″ data-end=”1059″><p data-start=”949″ data-end=”1059″>Is there a recommended way to import this time-varying data into Fluent and apply it as the inlet condition?<\/p><\/li>\n

    <li data-start=”1060″ data-end=”1153″><p data-start=”1063″ data-end=”1153″>Should this be done using a profile file, or is a UDF (DEFINE_PROFILE) required?<\/p><\/li>\n

    <li data-start=”1154″ data-end=”1236″><p data-start=”1157″ data-end=”1236″>Is there any built-in coupling approach within Fluent for this kind of setup?<\/p><\/li>\n<\/ol>\n

    <p data-start=”1238″ data-end=”1327″>Any advice, workflow examples, or documentation references would be highly appreciated.<\/p><p data-start=”1329″ data-end=”1351″>Thank you very much!<\/p><\/p>\n","protected":false},"template":"","class_list":["post-439511","topic","type-topic","status-publish","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-boundary-conditions","topic-tag-transient","topic-tag-velocity-profile-inlet"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["439511"],"_bbp_subscription":["505388","15476"],"_bbp_author_ip":["210.119.154.146"],"_bbp_last_reply_id":["439521"],"_bbp_last_active_id":["439521"],"_bbp_last_active_time":["2025-08-18 09:04:07"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["505388","15476"],"_btv_view_count":["806"],"_bbp_topic_status":["unanswered"],"_bbp_notification_enabled":["199"]},"test":"hjhjrhnaver-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/439511","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\/439511\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=439511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}