{"id":243152,"date":"2022-12-06T17:31:56","date_gmt":"2022-12-06T17:31:56","guid":{"rendered":"\/forum\/forums\/topic\/runaway-velocity-error-using-dynain-file-for-sequential-simulations-with-beams\/"},"modified":"2022-12-06T17:33:57","modified_gmt":"2022-12-06T17:33:57","slug":"runaway-velocity-error-using-dynain-file-for-sequential-simulations-with-beams","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/runaway-velocity-error-using-dynain-file-for-sequential-simulations-with-beams\/","title":{"rendered":"Runaway Velocity error: using dynain file for sequential simulations with beams"},"content":{"rendered":"

I am using the dynain method above to perform sequential simulations with beams. Similar to the topic discussed here: \/forum\/forums\/topic\/error-when-transferring-solution-to-new-model-in-the-project-schematic\/<\/a><\/p>\n

I have a structure that is composed of 60 beams and is slightly deformed in the first simulation and then in the second it is compressed. However, when I apply any BCs in the second simulation I get general errors due to out of range velocities. I am using Workbench LS-Dyna 2022 R2, here is the break down of my problem:<\/p>\n

When I use this method for beams it combines 60 beam bodies into 1 beam body:<\/p>\n

<\/a>-><\/a><\/p>\n

This would be fine as I can still select lines and nodes to apply BCs. <\/p>\n

However, when I apply BCs I get exponential kinetic energies. <\/p>\n

For example, if I apply a displacement to the top edges in the picture below and use a fixed support on the bottom edges. I get error due to runaway velocities:<\/p>\n

<\/a><\/p>\n

<\/a><\/p>\n

If I apply those BCs to the geometry in the first simulation (the one that doesn’t take geometry from dynain), I can compress the structure without exponential Kinetic energies. <\/p>\n

Do you have any advice for using beams in sequential simulations with dynain?<\/p>\n

Thanks in advance, <\/p>\n

Ben<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-243152","topic","type-topic","status-closed","hentry","topic-tag-beamelement-1","topic-tag-dynain-1","topic-tag-kinetic-energy","topic-tag-sequencialmodelling-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["8177","13468","181804"],"_bbp_author_ip":["23.192.164.14"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1120"],"_edit_lock":["1670348004:170393"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["243152"],"_bbp_forum_id":["27814"],"_bbp_engagement":["8177","13468","181804"],"_bbp_voice_count":["3"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["245352"],"_bbp_last_active_id":["245352"],"_bbp_last_active_time":["2023-01-03 10:42:18"]},"test":"mn17b2mleeds-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/243152","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\/243152\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=243152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}