{"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":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hi, I am trying to run a transient thermal-electric simulation. 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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).\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/transient-thermal-electric-system-issue\/\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/30-09-2024-1727670290-parameter.png\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/30-09-2024-1727670290-parameter.png\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-09-30T04:32:27+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-09-30T04:32:27+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Transient Thermal-Electric system issue | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"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).\" \/>\n\t\t<meta name=\"twitter:image\" content=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2024\/09\/30-09-2024-1727670290-parameter.png\" \/>\n\t\t<script type=\"application\/ld+json\" class=\"aioseo-schema\">\n\t\t\t{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/transient-thermal-electric-system-issue\\\/#breadcrumblist\",\"itemListElement\":[{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"position\":2,\"name\":\"Topics\",\"item\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/\",\"nextItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/transient-thermal-electric-system-issue\\\/#listItem\",\"name\":\"Transient Thermal-Electric system issue\"},\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum#listItem\",\"name\":\"Home\"}},{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/transient-thermal-electric-system-issue\\\/#listItem\",\"position\":3,\"name\":\"Transient Thermal-Electric system issue\",\"previousItem\":{\"@type\":\"ListItem\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/topics\\\/#listItem\",\"name\":\"Topics\"}}]},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/#organization\",\"name\":\"Ansys Learning Forum\",\"description\":\"Ansys Innovation Space\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/transient-thermal-electric-system-issue\\\/#webpage\",\"url\":\"https:\\\/\\\/innovationspace.ansys.com\\\/forum\\\/forums\\\/topic\\\/transient-thermal-electric-system-issue\\\/\",\"name\":\"Transient Thermal-Electric system issue | Ansys Learning Forum\",\"description\":\"Hi, I am trying to run a transient thermal-electric simulation. 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