Hi<\/p>\n
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I am using a Nonlinear Adaptive Region in a static structural analysis, to re-mesh as a response to large strains. I need to model very large strains (for steel), up to around a value of 1.<\/p>\n
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Known limitations of Ansys nonlinear adaptivity that I have already worked around:<\/p>\n
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I have attached an image of my geometry and boundary conditions.<\/p>\n
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The problem I encounter is blank areas of results<\/strong> (I think due to poor mesh).<\/p>\n <\/p>\n I have tried changing a variety of nonlinear adaptivity parameters in the Energy and Mesh criteria. I’ve also tried adjusting options in the nonlinear adaptive Analysis settings, including NSL & aggressive remeshing. Everything I have tried, in line with what I’ve read in the Mechanical help literature, seems to make the problem worse – with larger areas of results missing. And that’s if it works at all – two subsequent problems are (1)<\/strong> problem size limit (32k nodes) exceeded (I guess due to a significant increase in nodes after remeshing, which doesn’t actually make sense based on the geometry and deformation) or (2)<\/strong> “Internal solution magnitude exceeded”.<\/p>\n <\/p>\n In the case of subsequent error (2) I check the file0.err and fine the text below, relating to a number of nodes. I don’t understand, why I’m getting an error that elements are highly distorted, when that should have triggered remeshing.<\/p>\n <\/p>\n Does anyone have experience with nonlinear adaptivity and have advice on how to overcome these issues?<\/p>\n <\/p>\n <\/p>\n *** ERROR *** CP = 110.516 TIME= 21:59:28 \n<\/p><\/blockquote>\n","protected":false},"template":"","class_list":["post-45573","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["17755"],"_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":["4231"],"_bbp_subscription":["246864"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["45573"],"_bbp_forum_id":["27790"],"_bbp_engagement":["240","172577"],"_bbp_voice_count":["2"],"_bbp_reply_count":["13"],"_bbp_last_reply_id":["120115"],"_bbp_last_active_id":["120115"],"_bbp_last_active_time":["2020-07-03 19:59:50"]},"test":"langlinator"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/45573","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\/45573\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=45573"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
Element 9519 (type = 1, SOLID187) (and maybe other elements) has become
highly distorted. Excessive distortion of elements is usually a
symptom indicating the need for corrective action elsewhere. Try
incrementing the load more slowly (increase the number of substeps or
decrease the time step size). You may need to improve your mesh to
obtain elements with better aspect ratios. Also consider the behavior
of materials, contact pairs, and\/or constraint equations. Please rule
out other root causes of this failure before attempting rezoning or
nonlinear adaptive solutions. If this message appears in the first
iteration of first substep, be sure to perform element shape checking. <\/p>\n