{"id":29654,"date":"2018-07-06T11:08:57","date_gmt":"2018-07-06T11:08:57","guid":{"rendered":"\/forum\/forums\/topic\/fluent-transient-velocity-inlet-udf\/"},"modified":"2018-07-06T11:08:57","modified_gmt":"2018-07-06T11:08:57","slug":"fluent-transient-velocity-inlet-udf","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-transient-velocity-inlet-udf\/","title":{"rendered":"Fluent Transient velocity inlet UDF"},"content":{"rendered":"<p>Hi,&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>I&#8217;m currently having a problem getting the velocity inlet in my Fluent project to work as I wish. Maybe you may help.&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>The boundary conditions are set as shown in the figure attached (the wall section is a simple airfoil section on a tube).<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;I want the velocity to increase from 5m\/s to 50m\/s with time during the transient simulation so that the winglet is not instantly loaded with large aero loads. this way the FSI simulation is more gradual and stable.&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Through a simple UDF I managed to get the velocity to increase with time but this is in turn creating a problem in static pressure (gauge) as shown in the second and third figures attached.&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>I tried several methods to fix it but i m ending up with the same problem all the time.&nbsp;&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Do you have any idea how this can be fixed please?&nbsp;<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Thanks in advance,<\/p>\n<p><\/p>\n<p>Fabio Cauchi<\/p>\n","protected":false},"template":"","class_list":["post-29654","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["1823"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0","0","0","0"],"_btv_view_count":["4355"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["29654"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","154844","157640","164212"],"_bbp_voice_count":["4"],"_bbp_reply_count":["16"],"_bbp_last_reply_id":["84899"],"_bbp_last_active_id":["84899"],"_bbp_last_active_time":["2019-05-09 20:51:03"]},"test":"fabiocauchi"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/29654","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\/29654\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=29654"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}