{"id":240087,"date":"2022-11-08T11:06:45","date_gmt":"2022-11-08T11:06:45","guid":{"rendered":"\/forum\/?post_type=topic&#038;p=240087"},"modified":"2022-11-08T11:06:45","modified_gmt":"2022-11-08T11:06:45","slug":"subcycling-treatment-of-submodel-interface-nodes","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/subcycling-treatment-of-submodel-interface-nodes\/","title":{"rendered":"Subcycling: Treatment of Submodel Interface Nodes"},"content":{"rendered":"<p class=\"MsoNormal\">We are currently utilising the Subcycling algorithm in LS-Dyna. In doing so, we have noticed (what seems to be) an erroneous treatment of nodes at the interface of two submodels when using the CONTROL_SUBCYCLE keyword.<\/p>\n<p class=\"MsoNormal\"><span style=\"font-size: 14pt;font-family: Calibri, sans-serif\">To help depict the issue, a benchmark of 125 coarse elements and 250 fine elements has been created. The coarse elements are of dimensions 1x1x1, whereas the fine elements are of 0.5x1x1, both discretising a submodel of 125x1x1 (but one part ID). A typical half sine pulse has been applied to the fine domain at those four nodes at x = 250.<\/span><\/p>\n<p class=\"MsoNormal\"><span style=\"font-size: 14pt;font-family: Calibri, sans-serif\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/11\/08-11-2022-1667905231-mceclip0.png\" width=\"1024\" height=\"372\"><\/span><\/p>\n<p class=\"MsoNormal\"><span style=\"font-size: 14pt;font-family: Calibri, sans-serif\">W<\/span>ithout the CONTROL_SUBCYCLE keyword we see the half sine pulse propagate smoothly through the bar, seamlessly passing through the boundary. Plots correspond to the 2D model depiction above where the coloured circles are nodes on a selected edge.<\/p>\n<p class=\"MsoNormal\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/11\/08-11-2022-1667905307-mceclip0.png\" width=\"1032\" height=\"535\">\\<\/p>\n<p class=\"MsoNormal\">With the inclusion of CONTROL_SUBCYCLE_2 we see an increase in velocity (Figure 3), solely at those nodes at the interface (as depicted by Node 378). One also observes nonzero values at those nodes in the fine domain once the wave has propagated to the interface between the two submodels.<\/p>\n<p class=\"MsoNormal\"><img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2022\/11\/08-11-2022-1667905348-mceclip1.png\" width=\"1050\" height=\"560\"><\/p>\n<p class=\"MsoNormal\">&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-240087","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":["23.44.170.21"],"_bbp_subscription":["267087"],"_btv_view_count":["644"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["240087"],"_bbp_forum_id":["27814"],"_bbp_engagement":["267087"],"_bbp_voice_count":["1"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["240092"],"_bbp_last_active_id":["240092"],"_bbp_last_active_time":["2022-11-08 11:13:36"]},"test":"kin-chaneng-ox-ac-uk"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/240087","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\/240087\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=240087"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}