{"id":318790,"date":"2023-11-21T12:00:00","date_gmt":"2023-11-21T12:00:00","guid":{"rendered":"\/forum\/forums\/topic\/node-merge-causes-negative-jacobian\/"},"modified":"2023-11-21T12:00:00","modified_gmt":"2023-11-21T12:00:00","slug":"node-merge-causes-negative-jacobian","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/node-merge-causes-negative-jacobian\/","title":{"rendered":"Node merge causes negative Jacobian"},"content":{"rendered":"

I’m simulating this geometry with 2 threaded steel wires:<\/p>\n

\"\"<\/p>\n

It’s meshed with tetrahedrons. I tried to model the contact with 2 MPC bonded contacts, but I got a message that this wasn’t ideal, so I tried to use node merge instead. However, when I try this, I get a message: <\/p>\n

“Mesh has elements with negative jacobian values. It might be due to axis specified for general Axisymmetric object under Symmetry Folder is cutting through the body. Please check results carefully”.<\/p>\n

However, I have no symmetry in this model.<\/p>\n

Is there any way to fix this? Thanks.<\/p>\n","protected":false},"template":"","class_list":["post-318790","topic","type-topic","status-closed","hentry","topic-tag-mechanical","topic-tag-merge","topic-tag-mesh"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["43589","58821"],"_bbp_author_ip":["96.7.218.215"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["2539"],"_edit_lock":["1700649619:222554"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["318790"],"_bbp_forum_id":["27791"],"_bbp_engagement":["43589","58821"],"_bbp_voice_count":["2"],"_bbp_reply_count":["2"],"_bbp_last_reply_id":["319008"],"_bbp_last_active_id":["319008"],"_bbp_last_active_time":["2023-11-22 11:09:25"]},"test":"domenechcdei-upc-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/318790","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\/318790\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=318790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}