{"id":343142,"date":"2024-01-04T11:27:26","date_gmt":"2024-01-04T11:27:26","guid":{"rendered":"\/forum\/forums\/reply\/343142\/"},"modified":"2024-01-04T11:27:26","modified_gmt":"2024-01-04T11:27:26","slug":"343142","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/343142\/","title":{"rendered":"Reply To: Direct vs iterative solver"},"content":{"rendered":"<p>&lt;p&gt;I have also found that switching solvers can help the analysis to solve.&nbsp; I find that using the direct sparse option for relatively large structural jobs is usually quicker assuming it stays &#8220;in core&#8221; or in other words, there is sufficient RAM for the solution to use.&nbsp; I used to find for especially large jobs, if it was too big to run in core and effectively bombed out, the pcg itterative solver would work instead.&nbsp; However, these days with improvements to ansys and improvements to the size and speed of hard disks, it is less of an issue.&nbsp; To answer your question, I would expect the results should be approximately the same with either solver (there might be a little rounding).&lt;\/p&gt;&lt;p&gt;I do also recall several years ago some analysis that was a particularly large model running on a remote solver where we had some problems during the solve.&nbsp; The solve used the distributed option, it had contact so was non-linear.&nbsp; As I recall, the model would occasionally not solve with distributed mode, however it was a while ago so may have been a bug that is now fixed.&lt;\/p&gt;&lt;p&gt;You can also try changing the unit system, as I find that can help solve the model if any of the numbers are particualy big or small, it can cause issues.&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/01\/04-01-2024-1704367551-mceclip0.png\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-343142","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/343142","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/343142\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=343142"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}