{"id":387457,"date":"2024-09-30T04:32:27","date_gmt":"2024-09-30T04:32:27","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transient-thermal-electric-system-issue\/"},"modified":"2024-09-30T04:32:27","modified_gmt":"2024-09-30T04:32:27","slug":"transient-thermal-electric-system-issue","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transient-thermal-electric-system-issue\/","title":{"rendered":"Transient Thermal-Electric system issue"},"content":{"rendered":"<p>&lt;p&gt;Hi, I am trying to run a transient thermal-electric simulation. The idea is to investigate the temperature changes over time when a rectangular voltage pulse is applied to a part of the structure, with the opposite part grounded (Refer to figure). The boundary conditions are set to 300K throughout the whole simulation (Refer to figure). By default, the thermal-electric module is &#8216;steady-state&#8217; mode, hence to enable a transient mode simulation, I set the following parameters according to online sources:&nbsp;&lt;\/p&gt;&lt;p&gt;&#8221;antype,4 ! transient&lt;br&gt;timint,on&#8221;&lt;\/p&gt;&lt;p&gt;What I am expecting to see is a smooth exponential temperature decay over time when the voltage at the falling width of the rectangular pulse hits 0 V (The temperature should still be decaying even when no voltage is administered). However, at 0 V, the temperature immediately returns to 300 K (which is the boundary condition I set &#8211; refer to below diagram). This should not be the case? Moreover, when I modified the density or specific heat volume constant, it does not seem to affect the final temperature at all, even though I enable the transient mode. What could be wrong? I am using the ANSYS 2024 version. Thank you very much for your help.&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/30-09-2024-1727670290-parameter.png\" alt=\"\" width=\"490\" height=\"355\" \/>&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/30-09-2024-1727670063-snap1.png\" alt=\"\" width=\"495\" height=\"279\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-387457","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["462797","20905"],"_bbp_author_ip":["219.74.132.181"],"_btv_view_count":["180"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["387457"],"_bbp_forum_id":["27796"],"_bbp_engagement":["20905","462797"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["387781"],"_bbp_last_active_id":["387781"],"_bbp_last_active_time":["2024-10-02 08:49:33"]},"test":"shaoxiang_gomymail-sutd-edu-sg"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/387457","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\/387457\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=387457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}