{"id":459813,"date":"2026-06-16T01:23:46","date_gmt":"2026-06-16T01:23:46","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/shell-thickness-in-contact\/"},"modified":"2026-06-16T01:23:46","modified_gmt":"2026-06-16T01:23:46","slug":"shell-thickness-in-contact","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/shell-thickness-in-contact\/","title":{"rendered":"Shell thickness in contact"},"content":{"rendered":"<p>&lt;p class=&#8221;isSelectedEnd&#8221;&gt;I have a simulation that involves shell elements and SPH particles. According to the documentation, setting SHLTHK=0 under CONTROL_CONTACT means that the shell thickness is not considered in contact calculations.&nbsp;I used the same setting and ran the simulation. However, the messag&nbsp;file indicates that many SPH particles have initial contact.I do not understand how initial contact can occur if the shell thickness is ignored. I should mention that the coordinates used for geometry\/mesh generation were defined such that there was no penetration before starting the simulation.&nbsp;Could someone help me understand why these initial contacts are being detected and how to resolve this issue when the shell thickness is ignored in the contact definition?&lt;\/p&gt;&lt;p&gt;Thank you in advance.&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-459813","topic","type-topic","status-publish","hentry","topic-tag-contact","topic-tag-lsdyna","topic-tag-shell","topic-tag-shell-thickness-1","topic-tag-sph"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["459813"],"_bbp_author_ip":["142.104.85.82"],"_bbp_last_reply_id":["460176"],"_bbp_last_active_id":["460176"],"_bbp_last_active_time":["2026-06-22 08:48:59"],"_bbp_reply_count":["5"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["3"],"_bbp_engagement":["682300","679600","690265"],"_btv_view_count":["164"],"_bbp_topic_status":["unanswered"],"_bbp_subscription":["679600","682300","690265"]},"test":"lsdyna928gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/459813","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\/459813\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=459813"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}