{"id":406750,"date":"2025-01-23T09:25:21","date_gmt":"2025-01-23T09:25:21","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/thermal-simulation-of-a-power-converter\/"},"modified":"2025-01-27T12:27:33","modified_gmt":"2025-01-27T12:27:33","slug":"thermal-simulation-of-a-power-converter","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/thermal-simulation-of-a-power-converter\/","title":{"rendered":"Thermal simulation of a power converter"},"content":{"rendered":"

<p><p>Good morning,<\/p><p>I need some help in order to understand better why in my model I get very high temperatures compared to temperatures measured in reality.<br>On ANSYS Electronics Desktop (Icepak design) I’m trying to solve the conjugate heat transfer due to natural convection between PCB and electrical components (which are inside a plastic case) and the air, both internal and external. I will share also some pictures to better calrify the situation. <\/p><p><br><br><\/p><p><\/p><p>The setup of the simulation is the following:<br><br>I built up a domain big enough to simulate natural convetion<br>I used 2 refinements for the mesh: a box that includes all the case, internal air, upper components ecc, and another box that includes only the PCB and the components mounted on the bottom.<br><br>Boundary conditions: all walls with fixed temperature (ambient temperature);<br>Initial Conditions: Vx = 0; Vy = 0.001 m\/s (opposite to the gravity along -y); Vz = 0<br>Losses in [W] on different components using the “Block” model<br><br>For the setup, I followed suggestions the “natural convection default”, that is: the simulation is a steady-state, laminar flow, radiation is on (discrete ordinates model), ecc. (basically I didn’t change the natural convection default)<br>The problem, as I mentioned before, is that when the simulations starts, it is a bit unstable (as it can be seen from the diagrams) and final temperatures are pretty high. I was wondering if there was a setup problem somewhat (maybe boundaries), or if there is something I’m missing.Temperature plot on the “region”<\/p><p>Temperature plot on a cross section<br>Velocity plot on a cross section<br><br><br>I would be very grateful if someone has any suggestion or is able to help me. Thank you so much!<br><br><\/p><p> <\/p><\/p><\/p>\n","protected":false},"template":"","class_list":["post-406750","topic","type-topic","status-publish","hentry","topic-tag-AEDTICEPAK-1","topic-tag-ansys-icepak","topic-tag-conjugate-heat-transfer","topic-tag-fluid-solid-heat-transfer","topic-tag-icepak","topic-tag-icepak-thermal-1","topic-tag-pcb","topic-tag-steady-statethermalmodel-1","topic-tag-Steadystatethermalsimulation-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27793"],"_bbp_topic_id":["406750"],"_bbp_subscription":["482743","2688"],"_bbp_author_ip":["31.197.145.237"],"_bbp_last_reply_id":["407492"],"_bbp_last_active_id":["407492"],"_bbp_last_active_time":["2025-01-28 23:10:23"],"_bbp_reply_count":["10"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["482743","2688"],"_btv_view_count":["383"],"_bbp_topic_status":["unanswered"],"_edit_last":["482743"],"_bbp_revision_log":["a:1:{i:407184;a:2:{s:6:\"author\";i:482743;s:6:\"reason\";s:0:\"\";}}"]},"test":"318661studenti-unimore-it"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/406750","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":1,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/406750\/revisions"}],"predecessor-version":[{"id":407184,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/406750\/revisions\/407184"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=406750"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}