Hi everyone,<\/p>\n
<\/p>\n
I am modeling Fluid- structure interaction phenomenon in the human tissue – aortic valve.
Generally I solved many problems with convergence and so on, but now Im having a difficult time with the structural side.<\/p>\n
<\/p>\n
I applied a frictionless contact between the flexible walls, to avoid their collision – for the better moving mesh operation on the fluid side.
It worked very well, till I got the message:<\/p>\n
<\/p>\n
The solver engine was unable to converge on a solution for the nonlinear problem as constrained. Please see the Troubleshooting section of the Help System for more information.<\/strong><\/p>\n <\/p>\n Ofc I was reading about it and tried several ways to overcome the problem: <\/p>\n However, nothing helped.<\/p>\n <\/p>\n Do you have any other ideas what could I try? <\/p>\n <\/p>\n <\/p>\n Kind regards<\/p>\n <\/p>\n Destroy<\/p>\n","protected":false},"template":"","class_list":["post-39874","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["12053"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["4960"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["39874"],"_bbp_forum_id":["27791"],"_bbp_engagement":["240","161363","166004","173292"],"_bbp_voice_count":["4"],"_bbp_reply_count":["9"],"_bbp_last_reply_id":["108076"],"_bbp_last_active_id":["108076"],"_bbp_last_active_time":["2020-03-17 17:33:47"]},"test":"destroy"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/39874","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\/39874\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=39874"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
– reducing time step size
– in Analysis settings, changing number of substeps from 1 to 5
– in System Coupling, changing data transfer under relaxation factors
– analysis settings -> nonlinear controls -> stabilization – I tried to modify these settings<\/p>\n
I am also wondering if there is any other way to avoid structure collision than incorporating the contacts. Maybe some specific boundary condition \/ implementing construction geometry?<\/p>\n