{"id":403211,"date":"2025-01-02T09:48:45","date_gmt":"2025-01-02T09:48:45","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/coupled-field-frictional-thermal-runaway\/"},"modified":"2025-01-02T09:48:45","modified_gmt":"2025-01-02T09:48:45","slug":"coupled-field-frictional-thermal-runaway","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/coupled-field-frictional-thermal-runaway\/","title":{"rendered":"Coupled field frictional thermal runaway"},"content":{"rendered":"

<p>Hey guys,<\/p><p>I try to set up a frictional thermal runaway analysis. That means I would like to prove in a transient thermal-mechanical coupled field analysis, that the thermal heat of the friction contact leads to more heat –> higher temperature –> more thermal expansion –> more contact pressure –> more heat and so on.. A kind of escalating heating effect.<\/p><p>My idea is the following: (for public discussion purpose it is a little bit simplefied)<\/p><p>I have a axisymmetric 2D model of the problem. Red and green are housing parts and blue is the sealing i would like to evaluate more in detail. The red part is rotating arround the y-axis. The rest is standing still. Frictional contacts are defined between red and blue, blue and green. Green is fixed over a compression only on the bottom line.<\/p><p><\/p><\/p>\n

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  1. Load step: heating up all bodies to working temperature of 50°C for 60 secounds<\/li>\n
  2. Ramping up the rotational velocity up to 100 rad\/s for 60 secounds<\/li>\n
  3. holding 100 rad\/s for an amount of time (at the moment 480s)<\/li>\n<\/ol>\n

    <p><\/p><p>When I look now at the results, I have the problem, that it seems to be that the velocity is not working in the way i would assume it.<\/p><p><\/p><p>The total velocity is not showing my ramping up set up.<\/p><p><\/p><p>And the heat generation (looking at heat flux) is also not correlating to the ramping up. This would be at least what i would expect. I have an amount of contact pressure (something arround 10 MPa). In combination with the rotation veloctiy multiplied with friction coefficient i would assume a heating up. <\/p><p>Do i have a missunderstanding arround the rotational velocity function in this setup? <\/p><p>Any help, idea or tipp is appreciated!<\/p><\/p>\n","protected":false},"template":"","class_list":["post-403211","topic","type-topic","status-publish","hentry","topic-tag-coupled-field-1","topic-tag-thermal-structural-1","topic-tag-transient-analysis"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27794"],"_bbp_topic_id":["403211"],"_bbp_subscription":["15563","20905"],"_bbp_author_ip":["84.176.138.33"],"_bbp_last_reply_id":["404119"],"_bbp_last_active_id":["404119"],"_bbp_last_active_time":["2025-01-08 15:46:42"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["15563","20905"],"_btv_view_count":["514"],"_bbp_topic_status":["unanswered"],"_bbp_likes_count":["1"]},"test":"christopher-smyrekenvision-energy-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/403211","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\/403211\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=403211"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}