{"id":40068,"date":"2020-01-10T18:36:47","date_gmt":"2020-01-10T18:36:47","guid":{"rendered":"\/forum\/forums\/topic\/eigenvalue-buckling-problem\/"},"modified":"2020-01-10T18:36:47","modified_gmt":"2020-01-10T18:36:47","slug":"eigenvalue-buckling-problem","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/eigenvalue-buckling-problem\/","title":{"rendered":"Eigenvalue Buckling Problem"},"content":{"rendered":"<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">Hello,<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">I was doing a eigenvalue buckling analysis to find the first buckling mode. The static structural part works well, but it fails to solve the eigenvalue buckling part.<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">The solver output&nbsp;demonstrates&nbsp;following warning messages:<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">&nbsp; SUBSPACE CALCULATION OF UP TO&nbsp;&nbsp;&nbsp; 1 EIGENVECTORS.<br \/>&nbsp; NUMBER OF EQUATIONS&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 76830<br \/>&nbsp; MAXIMUM WAVEFRONT&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 54<br \/>&nbsp; MAXIMUM MODES STORED&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1<br \/>&nbsp; MINIMUM EIGENVALUE&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= -0.10000E+31<br \/>&nbsp; MAXIMUM EIGENVALUE&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=&nbsp; 0.10000E+31<br \/>&nbsp; CENTER EIGENVALUE&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =&nbsp; 0.00000E+00<\/p>\n<p>&nbsp; Local memory allocated for solver&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=&nbsp;&nbsp;&nbsp;&nbsp; 61.549 MB<br \/>&nbsp; Local memory required for in-core solution&nbsp; &nbsp; &nbsp; &nbsp;=&nbsp;&nbsp;&nbsp;&nbsp; 58.710 MB<br \/>&nbsp; Local memory required for out-of-core solution =&nbsp;&nbsp;&nbsp;&nbsp; 24.705 MB<\/p>\n<p>&nbsp; Total memory allocated for solver&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=&nbsp;&nbsp;&nbsp; 238.981 MB<br \/>&nbsp; Total memory required for in-core solution&nbsp; &nbsp; &nbsp; &nbsp;=&nbsp;&nbsp;&nbsp; 227.885 MB<br \/>&nbsp; Total memory required for out-of-core solution =&nbsp;&nbsp;&nbsp;&nbsp; 96.285 MB<\/p>\n<p>&nbsp;*** NOTE ***&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CP =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 7.109&nbsp;&nbsp; TIME= 13:23:45<br \/>&nbsp;The Distributed Sparse Matrix Solver is currently running in the&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br \/>&nbsp;in-core memory mode.&nbsp; This memory mode uses the most amount of memory&nbsp;&nbsp; <br \/>&nbsp;in order to avoid using the hard drive as much as possible, which most&nbsp; <br \/>&nbsp;often results in the fastest solution time.&nbsp; This mode is recommended&nbsp;&nbsp; <br \/>&nbsp;if enough physical memory is present to accommodate all of the solver&nbsp;&nbsp; <br \/>&nbsp;data.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/p>\n<p>&nbsp;*** WARNING ***&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CP =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 11.016&nbsp;&nbsp; TIME= 13:23:49<br \/>&nbsp;There are no solutions in the selected range.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/p>\n<p>&nbsp;*** NOTE ***&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CP =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 11.016&nbsp;&nbsp; TIME= 13:23:49<br \/>&nbsp;There are no modes in the specified range.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <\/p>\n<p>&nbsp;*** NOTE ***&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; CP =&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 11.016&nbsp;&nbsp; TIME= 13:23:49<br \/>&nbsp;There are no modes in the specified range.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">How could this problem be solved?<\/p>\n<p><\/p>\n<p style=\"box-sizing: border-box; margin: 0px 0px 10px; font-size: 15px; overflow-x: hidden; font-family: 'Open Sans', Arial, Helvetica, sans-serif;\">Thanks.<\/p>\n","protected":false},"template":"","class_list":["post-40068","topic","type-topic","status-closed","hentry","topic-tag-buckling-analysis"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["12247"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1662"],"_bbp_subscription":["246361","288918"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["40068"],"_bbp_forum_id":["27791"],"_bbp_engagement":["172052","173329","178716","288918"],"_bbp_voice_count":["4"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["304472"],"_bbp_last_active_id":["304472"],"_bbp_last_active_time":["2023-09-01 00:31:41"]},"test":"hz776"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/40068","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\/40068\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=40068"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}