{"id":180794,"date":"2021-06-07T17:54:20","date_gmt":"2021-06-07T17:54:20","guid":{"rendered":"\/forum\/forums\/reply\/180794\/"},"modified":"2021-06-07T17:54:20","modified_gmt":"2021-06-07T17:54:20","slug":"180794","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/180794\/","title":{"rendered":"Reply To: Ansys Aqwa Deactivated Freedoms not working properly"},"content":{"rendered":"<p>\nDeactivated Freedoms in time domain calculations may not be the most rigorous approach to restricting a structure&#8217;s motion, due to the way in which the freedom deactivation is applied. The change in position that you see is basically the sum of numerical round-off errors over a large number of time steps. Deactivated Freedoms are usually more appropriate for stability analyses, where we are iterating towards convergence of the forces acting on each structure.<br \/>\nA better approach for this workflow may be to use an arrangement of Fenders between Fixed Points and the pile guide. To restrict motions to Z and RZ only, you will need 8 Fenders on each pile guide, arranged as shown:<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/768\/MLSXR80BE44N.png\" width=\"143\" height=\"312\" \/>Viewed from above:<br \/>\n<img loading=\"lazy\" decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/939\/O26NLFFODR59.png\" width=\"157\" height=\"157\" \/>This approach also allows you to define stiffness and friction terms which may give a more realistic model of the actual pile-jetty connection.<br \/>\nI hope this helps; please let me know if you have any further questions.<br \/>\nCheers, Mike<\/p>\n<p><\/p>\n","protected":false},"template":"","class_list":["post-180794","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"acf":[],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/180794","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/reply"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/replies\/180794\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=180794"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}