{"id":306227,"date":"2023-09-11T22:27:00","date_gmt":"2023-09-11T22:27:00","guid":{"rendered":"\/forum\/forums\/topic\/boundary-conditions-in-a-non-linear-and-multi-step-simulation\/"},"modified":"2023-09-11T22:27:00","modified_gmt":"2023-09-11T22:27:00","slug":"boundary-conditions-in-a-non-linear-and-multi-step-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/boundary-conditions-in-a-non-linear-and-multi-step-simulation\/","title":{"rendered":"Boundary conditions in a non-linear and multi-step simulation"},"content":{"rendered":"

Hello, everyone,
I have a problem that I can’t figure out how to solve. I should insert the tool you see in the figure inside the hollow curved channel and then simulate that the tip remains locked while the base of the tool rotates on its axis to evaluate the effects of twisting. <\/p>\n

<\/p>\n


The first part of the insertion into the channel works fine, the problem is when I try to twist the instrument because it takes a curved position and I can’t impose total locking of the tip. 
I have tried using a remote displacement (which is activated only in the third and fourth substeps, after the instrument is completely inside in the channel) and creating a new coordinate system that has an axis as parallel as possible to the instrument tip.<\/p>\n

<\/p>\n

<\/p>\n

But as soon as the third substep starts, the simulation crashes because it cannot converge. <\/p>\n

<\/p>\n

<\/p>\n

How can I try to solve it?<\/p>\n

 <\/p>\n","protected":false},"template":"","class_list":["post-306227","topic","type-topic","status-closed","hentry","topic-tag-boundary-conditions","topic-tag-contact","topic-tag-coordinate-system","topic-tag-material-nonlinearity-1","topic-tag-mechanical","topic-tag-remote-displacement","topic-tag-torsion"],"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\n\t\t\n\t\t\n\t\t