{"id":244879,"date":"2022-12-26T16:45:04","date_gmt":"2022-12-26T16:45:04","guid":{"rendered":"\/forum\/forums\/topic\/modal-analysis-results-differ-significantly-depending-on-mesh-size\/"},"modified":"2022-12-26T16:45:04","modified_gmt":"2022-12-26T16:45:04","slug":"modal-analysis-results-differ-significantly-depending-on-mesh-size","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/modal-analysis-results-differ-significantly-depending-on-mesh-size\/","title":{"rendered":"Modal analysis. Results differ significantly depending on mesh size"},"content":{"rendered":"<p>Hello everyone.&nbsp;<\/p>\n<p>Merry Christmass to everyone.&nbsp;<\/p>\n<p>I want to get natural frequency of the rotor. Rotor model made as assemly and it has contacts.<\/p>\n<p>&nbsp;I performed 2 analysis with different mesh size.&nbsp;<\/p>\n<p>First analysis has 680K elements and second has 980K elements.&nbsp;<\/p>\n<p>First analysis results are: 10, 10, 39 Hz.<\/p>\n<p>Second analysis results are: 4, 4, 19 Hz.<\/p>\n<p>39 and 19 Hz its rotation around rotor axis.&nbsp;<\/p>\n<p>What I do wrong? Why I am getting different results on different mesh? I read that mesh size does not influence on modal analysis results.<\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/12\/26-12-2022-1672072625-Screenshot_1.jpg\" alt=\"\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/12\/26-12-2022-1672072660-Screenshot_2.jpg\" alt=\"\"><\/p>\n<p>&nbsp;<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/12\/26-12-2022-1672072674-Screenshot_3.jpg\" alt=\"\"><\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/12\/26-12-2022-1672072713-Screenshot_4.jpg\" alt=\"\"><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/12\/26-12-2022-1672072733-Screenshot_5.jpg\" alt=\"\" width=\"1064\" height=\"599\"><\/p>\n","protected":false},"template":"","class_list":["post-244879","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["268514","223465","20905"],"_bbp_author_ip":["23.220.96.180"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1840"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["244879"],"_bbp_forum_id":["27791"],"_bbp_engagement":["20905","223465","268514"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["244943"],"_bbp_last_active_id":["244943"],"_bbp_last_active_time":["2022-12-27 20:30:46"]},"test":"ilya-gordievsky-workgmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/244879","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\/244879\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=244879"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}