{"id":359788,"date":"2024-04-01T10:46:04","date_gmt":"2024-04-01T10:46:04","guid":{"rendered":"\/forum\/forums\/topic\/can-not-achieve-a-pseudo-steady-state-condition\/"},"modified":"2024-04-01T10:46:04","modified_gmt":"2024-04-01T10:46:04","slug":"can-not-achieve-a-pseudo-steady-state-condition","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/can-not-achieve-a-pseudo-steady-state-condition\/","title":{"rendered":"Can not achieve a pseudo-steady-state condition"},"content":{"rendered":"<p>I am trying to simulate 2D conjugate heat transfer over a finned surface. The simulation works fine and shows some results as shown below which is temperature profile.&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/01-04-2024-1711967940-COnjugate.PNG\" alt=\"\"><\/p>\n<p>But, the problem is that the wall temperature keeps rising even after simulating it for 60 seconds of time (transient) as shown below.&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/01-04-2024-1711967982-temp.PNG\" alt=\"\"><\/p>\n<p>I expect the wall temperature to reach some pseuso-steady state condition (like shown below). But it does not reach that stage.&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/04\/01-04-2024-1711968317-pseurostate.png\" alt=\"\"><\/p>\n<p>I have made mesh really small (having minimum cell size = 0.00005 m) and time step of 0.00005 s, which are the smaller values than what I see in literature. So, I think mesh or time step is not the problem. Also I use second order schemes. I tried all SIMPLE, PISO and coupled. and all does not show the desired result (Temp keeps rising)<\/p>\n<p>I have also seen similar problem with other software as well. I am sure I have been doing something fundamental mistake here. What is it?&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-359788","topic","type-topic","status-closed","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-2d-heat-conduction-1","topic-tag-conjugate-heat-transfer","topic-tag-convection"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["32604","199"],"_bbp_author_ip":["96.7.218.223"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["429"],"_bbp_topic_status":["unanswered"],"_bbp_likes_count":["0"],"_bbp_topic_id":["359788"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","32604"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["360228"],"_bbp_last_active_id":["360228"],"_bbp_last_active_time":["2024-04-03 09:17:44"]},"test":"lirilsilviuaeu-ac-ae"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/359788","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\/359788\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=359788"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}