{"id":453059,"date":"2026-02-20T21:57:51","date_gmt":"2026-02-20T21:57:51","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/prescribed_motion_rigid-problem\/"},"modified":"2026-02-20T22:00:59","modified_gmt":"2026-02-20T22:00:59","slug":"prescribed_motion_rigid-problem","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/prescribed_motion_rigid-problem\/","title":{"rendered":"prescribed_motion_rigid problem"},"content":{"rendered":"<p>&lt;p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;Hello there,&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;I have a model in which an indenter penetrates a cubic material. The indenter is a rigid body and the cube is SPH node. I also used a node_to_surface contact. For the penetration, I want the indenter to move downward for 5mm. So, I used the PRESCRIBED_MORION_RIGID and also defined a curve (for displacement, so x axis is time) as follows:&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;(0,0)&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;(1.1,-5)&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;The termination time is 1. The problem is that the indenter stuck in 2.5mm and does not move downward to 5mm which I applied. I have tried several contact parameters but no changes happened (still get stuck in 2.5). After that I tried the following displacement curve and time:&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;(0,0)&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;(1,-5)&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;(2.1,-5)&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;The termination time is 2. The output of this simulation was different and the indenter moved downward more that 2.5; however, it is now goes to 10mm. Which is more that the prescribed displacement in curve. &lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;I would be very grateful if someone can help in this regard. Am I applying the displacement in a wrong way? Is the curve wrong? Do I understand the prescribed_motion_rigid keyword wrongly?&lt;\/p&gt;&lt;p class=&#8221;MsoNormal&#8221;&gt;I do appreciate any feedback and advice. &lt;\/p&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-453059","topic","type-topic","status-publish","hentry","topic-tag-boundary","topic-tag-curve","topic-tag-define-loads","topic-tag-displacement","topic-tag-lsdyna","topic-tag-rigid-body-motion"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27814"],"_bbp_topic_id":["453059"],"_bbp_subscription":["649427","275204"],"_bbp_author_ip":["134.87.145.148"],"_bbp_last_reply_id":["453329"],"_bbp_last_active_id":["453329"],"_bbp_last_active_time":["2026-02-26 16:33:16"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["649427","275204"],"_btv_view_count":["101"],"_bbp_topic_status":["unanswered"],"_edit_last":["649427"],"_edit_lock":["1771625060:649427"]},"test":"zahra-abd994gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/453059","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\/453059\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=453059"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}