{"id":359538,"date":"2024-03-28T22:44:21","date_gmt":"2024-03-28T22:44:21","guid":{"rendered":"\/forum\/forums\/topic\/slow-down-of-a-mechanical-simulation-after-restarting\/"},"modified":"2024-03-28T22:44:21","modified_gmt":"2024-03-28T22:44:21","slug":"slow-down-of-a-mechanical-simulation-after-restarting","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/slow-down-of-a-mechanical-simulation-after-restarting\/","title":{"rendered":"Slow down of a mechanical simulation after restarting"},"content":{"rendered":"<p>Hi all,<\/p>\n<p>I am doing a two-way FSI simulation with Transient structral and Fluent via System coupling. I run the simulation on the university cluster with 30 &#8211; 40 processors.<\/p>\n<p>Recently, I found when I restart the simulation, the mechanical part calculation becomes very slow. I also met the case where I cannot properly restart the FSI due to mechanical simulation as it says it cannot find all files required for restart (.Rnn etc), where I used the exact same amount of processors I used for the first run.&nbsp;<\/p>\n<p>I found the problem is caused by the following notes from output in my first run, where I requested 35 processors:<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/28-03-2024-1711665802-mceclip0.png\"><\/p>\n<p>ANSYS did not use all the processors I requested, therefore when I tried to restart, it cannot find past files for those extra processors not used.<\/p>\n<p>Once I re-specify the number of processors, simulation continues. However, mechanical simulation becomes very slow while fluent part is fine.<\/p>\n<p>Previously, I did not meet the case where ANSYS did not use all processors, and restarted simulation was fine. Anyone can help me with this? How to let ANSYS use all processors requested?<\/p>\n<p>Sincerely,<\/p>\n<p>Eric<\/p>\n","protected":false},"template":"","class_list":["post-359538","topic","type-topic","status-closed","hentry","topic-tag-mechanicalworkbench-1","topic-tag-fsi","topic-tag-processor-1","topic-tag-transient-structural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["21343","3937","342695"],"_bbp_author_ip":["23.206.193.146"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["666"],"_bbp_topic_status":["unanswered"],"_edit_lock":["1711665972:228887"],"_bbp_topic_id":["359538"],"_bbp_forum_id":["27791"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["360037"],"_bbp_last_active_id":["360037"],"_bbp_last_active_time":["2024-04-02 14:12:08"],"_bbp_reply_count_hidden":["1"],"_bbp_engagement":["3937","21343"]},"test":"yu272umn-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/359538","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\/359538\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=359538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}