{"id":303468,"date":"2023-08-26T15:42:02","date_gmt":"2023-08-26T15:42:02","guid":{"rendered":"\/forum\/forums\/topic\/how-to-overcome-numerical-instability-issues-with-reduced-time-step-size\/"},"modified":"2023-08-26T15:42:02","modified_gmt":"2023-08-26T15:42:02","slug":"how-to-overcome-numerical-instability-issues-with-reduced-time-step-size","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-overcome-numerical-instability-issues-with-reduced-time-step-size\/","title":{"rendered":"How to overcome numerical instability issues with reduced time step size"},"content":{"rendered":"<p>I am running a basic system coupling to simulate tube flow simulation using fluid solid interface. when reducing the time step size i encounter instabilities that result in unrealistic deformations. when replaying deformations in the tube in transient structural the tube looks like it is exploding. with larger time steps this issue does not exist and the simulation runs smoothly. My question is, why does this instability exist with reduced time stepping and how can i overcome that issue ?<\/p>\n","protected":false},"template":"","class_list":["post-303468","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["273197","199"],"_bbp_author_ip":["168.143.243.24"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2742"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["303468"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","273197"],"_bbp_voice_count":["2"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["304514"],"_bbp_last_active_id":["304514"],"_bbp_last_active_time":["2023-09-01 09:19:30"]},"test":"fia11mail-aub-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/303468","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\/303468\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=303468"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}