{"id":343030,"date":"2024-01-03T19:54:06","date_gmt":"2024-01-03T19:54:06","guid":{"rendered":"\/forum\/forums\/topic\/direct-vs-iterative-solver\/"},"modified":"2024-01-03T19:54:06","modified_gmt":"2024-01-03T19:54:06","slug":"direct-vs-iterative-solver","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/direct-vs-iterative-solver\/","title":{"rendered":"Direct vs iterative solver"},"content":{"rendered":"<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt\">Hello,<\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt\">In general, should I expect the direct\/sparse solver or the iterative\/PCG solver to give roughly the same results (stress, strain, deformation), if converged, for Transient Structural simulations?<\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt\">I currently am running a Transient Structural simulation of an additive manufacturing process (so there are command objects that implement progressive birth\/death), which get temperature loads from a Transient Thermal simulation (which has command objects to add heat generation).<\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt\">I ask this because sometimes changing solvers seems to help the simulation run (i.e., avoid certain errors) in some situations (depending on other simulation parameters such as the length of each load step, mesh size, and using linear vs quadratic elements). I am not sure if switching solvers is an acceptable way to address these simulation issues.<\/p>\n<p class=\"MsoNormal\" style=\"margin-bottom: .0001pt\">Thank you!<\/p>\n","protected":false},"template":"","class_list":["post-343030","topic","type-topic","status-closed","hentry","topic-tag-DirectSolver-1","topic-tag-iterative-solver-1","topic-tag-transient-structural"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["168004","200","180022"],"_bbp_author_ip":["23.206.193.41"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["13661"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["343030"],"_bbp_forum_id":["27791"],"_bbp_engagement":["200","168004","180022"],"_bbp_voice_count":["3"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["343142"],"_bbp_last_active_id":["343142"],"_bbp_last_active_time":["2024-01-04 11:27:26"]},"test":"rgdiscovery"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/343030","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\/343030\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=343030"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}