{"id":165139,"date":"2023-03-17T08:59:31","date_gmt":"2023-03-17T08:59:31","guid":{"rendered":"\/knowledge\/forums\/topic\/rigidwall-vs-contact-with-a-rigid-target\/"},"modified":"2023-07-31T12:30:40","modified_gmt":"2023-07-31T12:30:40","slug":"rigidwall-vs-contact-with-a-rigid-target","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/rigidwall-vs-contact-with-a-rigid-target\/","title":{"rendered":"*RIGIDWALL vs. *CONTACT with a rigid target"},"content":{"rendered":"

The default treatment for a rigidwall is to set a node’s velocity to zero when it reaches the wall. The kinetic energy of the node is lost and not recoverable. Most *CONTACT interfaces use a penalty method; this can be applied to the rigidwall by specifying RWPNAL in *CONTROL_CONTACT.\u00c2\u00a0 With a penalty method, the node’s motion is essentially resisted by a spring.\u00c2\u00a0 The node’s kinetic energy is converted to potential energy in the spring (RWPNAL=1.0 is a good starting point). *CONTACT and *RIGIDWALL generally give the same change in momentum of the body.\u00c2\u00a0 The penalty-based rigidwall formulation differs from the default formulation in that (1) slave nodes may belong to rigid bodies and (2) the rigidwall energy is recoverable.<\/p>\n","protected":false},"template":"","class_list":["post-165139","topic","type-topic","status-publish","hentry","topic-tag-ls-dyna","topic-tag-ls-dyna-suite","topic-tag-lsdyna","topic-tag-r10","topic-tag-structural-mechanics"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t