{"id":374795,"date":"2024-08-01T23:33:32","date_gmt":"2024-08-01T23:33:32","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/?post_type=topic&p=374795"},"modified":"2024-08-01T23:33:32","modified_gmt":"2024-08-01T23:33:32","slug":"how-to-make-an-adiabatic-wall-in-fluent","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-make-an-adiabatic-wall-in-fluent\/","title":{"rendered":"How to make an adiabatic wall in Fluent"},"content":{"rendered":"

Hi! I have got an elbow pipe with a stream at -100°C, surrounding atmosphere is air at 20°C.<\/p>\n

I’d like to know how to make the wall adiabatic.
If I set the heat transfer boundary condition to 0 I get this:<\/p>\n

<\/p>\n

The’re a gradient on the outside.
There’s no material flow through the wall:<\/p>\n

 <\/p>\n

Now, the adiabatic hypothesis is quite strong and I might even take this “smoothing” as it is without posing question, but I have two issues:<\/p>\n

    \n
  1. Here, it looks like the pipe is behaving more like an ideal heat source at T=Twall_cell. Which might be useful, but it really is not anything I have ever been taught as adiabatic<\/li>\n
  2. The main one: it gives me some issues with residuals and convergence<\/li>\n<\/ol>\n

    Where am I messing up? At some point I’ll hopefully have the time to properly initialize the wall heat transfer, but till then I’d much rather shut off any heat flow there.<\/p>\n","protected":false},"template":"","class_list":["post-374795","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["131.175.66.129"],"_bbp_subscription":["60427","15180","199"],"_btv_view_count":["947"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["374795"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","15180","60427"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["377685"],"_bbp_last_active_id":["377685"],"_bbp_last_active_time":["2024-08-08 10:36:00"]},"test":"alex-chiellamail-polimi-it"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/374795","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/374795\/revisions"}],"predecessor-version":[{"id":374796,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/374795\/revisions\/374796"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=374795"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}