{"id":168933,"date":"2022-04-27T08:30:26","date_gmt":"2022-04-27T08:30:26","guid":{"rendered":"\/forum\/forums\/topic\/i-am-having-convergence-issues-for-a-non-linear-problem\/"},"modified":"2022-05-10T06:54:00","modified_gmt":"2022-05-10T06:54:00","slug":"i-am-having-convergence-issues-for-a-non-linear-problem","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/i-am-having-convergence-issues-for-a-non-linear-problem\/","title":{"rendered":"I am having Convergence issues for a non-linear problem"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>For context the simulation is the expansion of a coronary stent via an expanding balloon, please see the attached images of the geometries as well as the mesh.<\/p>\n<p>A displacement is applied to the balloon in a 2 step configuration which expands the stent from 3mm to 4.5mm. The stent is modelled as a PLLA (polymer) bilinear isotropic hardening and the balloon as a mooney-rivlin 2 parameter.<\/p>\n<p>In the Solution Output section under the Displacement\/Force etc Convergence, the simulation will reach around 17% solved and then struggle to converge. After the maximum number of substeps it stops the solver but adding more wouldn&#039;t reach convergence I don&#039;t think. I have tried some of the troubleshooting suggestions but no luck.<\/p>\n<p>I will add that a previous simulation with a different geometry, which has much less elements in both the balloon and stent solves in ~40 mins. All the settings from the previous simulation were kept the same for this new simulation so I&#039;d expect it to solve whilst taking longer, but it doesn&#039;t solve at all.<\/p>\n<p>I will attach as much information as possible in the contact, analysis and displacement settings. Any help would be greatly appreciated!<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/766\/JT3AN75V0BAC.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/766\/JT3AN75V0BAC.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-168933","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["1871"],"_bbp_likes_count":["0"],"_bbp_subscription":["253645"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["168933"],"_bbp_forum_id":["27791"],"_bbp_engagement":["88","165069","253645"],"_bbp_voice_count":["3"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["213219"],"_bbp_last_active_id":["213219"],"_bbp_last_active_time":["2022-05-10 06:54:00"]},"test":"samuel-llewellynstudent-manchester-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/168933","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\/168933\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=168933"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}