{"id":247638,"date":"2023-01-26T21:10:34","date_gmt":"2023-01-26T21:10:34","guid":{"rendered":"\/forum\/forums\/topic\/non-uniform-heat-flux-boundary-condition-for-a-cylinder-tube\/"},"modified":"2023-01-27T16:28:15","modified_gmt":"2023-01-27T16:28:15","slug":"non-uniform-heat-flux-boundary-condition-for-a-cylinder-tube","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/non-uniform-heat-flux-boundary-condition-for-a-cylinder-tube\/","title":{"rendered":"Non-uniform heat flux boundary condition for a cylinder tube."},"content":{"rendered":"<p>Hello all,<\/p>\n<p>I am currently trying to implement a non-uniform heat flux boundary condition around a cylinder. I have my cylinder split into 4 surface, ie top_left_surface, bottom_left_surface, etc (Figure below)&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/01\/26-01-2023-1674766708-mceclip0.png\"><\/p>\n<p>For each of the outer tube surface, I am trying to implement a heat flux boundary condition via function expression using a polynomial profile that I curve fitted. The profile is for one quarter of the tube surface is implemented as below:&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/01\/26-01-2023-1674767017-mceclip2.png\"><\/p>\n<p>Here, I am assuming &#8220;0m&#8221; when z = 0, y = 23.5m (where radius of the outer surface is 23.5m). Hence, what i am expecting is that at z = 0 and y = 23.5m, the heatflux there should be about 470.1W\/m^2. However, the simulation shows otherwise an the heat flux values are far off from what I am expecting.<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/01\/26-01-2023-1674767338-mceclip3.png\"><\/p>\n<p>&nbsp;<\/p>\n<p>I believe there is something I am not understanding with the cartesian coordinates when I am fitting my heat flux boundary curves, or there is something I am not understanding with implementing a polynomial profile on a curved surface. Any feedback on how I can properly implement this is very much appreciated.&nbsp;<\/p>\n<p>Thank you,<\/p>\n<p>Celine&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-247638","topic","type-topic","status-closed","hentry","topic-tag-fluent","topic-tag-heat-flux-bc-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["273505","22555"],"_bbp_author_ip":["23.77.218.237"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["884"],"_bbp_status":["publish"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["247638"],"_bbp_forum_id":["27792"],"_bbp_engagement":["22555","273505"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["247757"],"_bbp_last_active_id":["247757"],"_bbp_last_active_time":["2023-01-27 16:28:10"]},"test":"csl9r3umsystem-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/247638","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\/247638\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=247638"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}