{"id":248161,"date":"2023-01-31T13:32:33","date_gmt":"2023-01-31T13:32:33","guid":{"rendered":"\/forum\/forums\/topic\/cfd-thermal-cool-down-analysis\/"},"modified":"2023-01-31T13:32:33","modified_gmt":"2023-01-31T13:32:33","slug":"cfd-thermal-cool-down-analysis","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/cfd-thermal-cool-down-analysis\/","title":{"rendered":"CFD-thermal cool down analysis"},"content":{"rendered":"<p>Good afternoon,<\/p>\n<p>I&#8217;m trying to design a protection cover going over a steel pipe and used to insulate the pipe. I have represented below a simplified model. The various parts of the model are as per discruption below: <span>Insulation cover (in red) <span>\/ <span>Air gap <span><span>\/ <span>Internal gaz <span><span>\/ <span>Steel pipe.<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p>In reality the model is more complex but I have made some simplification here for better comprehension.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/01\/31-01-2023-1675170298-mceclip0.png\" width=\"318\" height=\"147\"><\/p>\n<p>This is for a cool down analysis where the internal gas (<span>in yellow<\/span>) will be heated up to approx 80&deg;C. When gas flow is shut down, during a given time, the area under the insulation cover (<span>in red<\/span>) must stay above a given temperature. My client is asking to use CFD (Fluent) rather than a typical transient thermal within workbench to assess the convection effect of the air entraped (<span>in green<\/span>) and also in the internal gas (<span>in yellow<\/span>).<\/p>\n<ol>\n<li>I assume that there won&#8217;t be any gas circulation during cool down. Is it possible within Ansys fluent to specify no inlet or outlet? or we must have some inlet and outlet to perform such analysis.<\/li>\n<li>I want to set-up the internal gaz to be at 80&deg;C a t=0s and let the gas cool down for 1hr (for example). How to do that within Ansys fluent? External surfaces of the assembly will be at 4&deg;C.<\/li>\n<li>How to asign the starting temperature to the gas? I can asign a temperature to a surface but it seems not possible to asign a temperature to the full internal gaz?<\/li>\n<\/ol>\n<p>Thanks in advance for your help<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-248161","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["271954","199"],"_bbp_author_ip":["23.56.168.214"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["454"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["248161"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","271954"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["248179"],"_bbp_last_active_id":["248179"],"_bbp_last_active_time":["2023-01-31 15:13:45"]},"test":"pierre-alexandre-drutaisltd-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/248161","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\/248161\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=248161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}