{"id":158911,"date":"2021-05-27T13:23:08","date_gmt":"2021-05-27T13:23:08","guid":{"rendered":"\/forum\/forums\/topic\/boundary-conditions-of-a-floating-body-static-structural\/"},"modified":"2021-06-08T11:43:56","modified_gmt":"2021-06-08T11:43:56","slug":"boundary-conditions-of-a-floating-body-static-structural","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/boundary-conditions-of-a-floating-body-static-structural\/","title":{"rendered":"Boundary conditions of a floating body (Static Structural)"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hello!<\/p>\n<p>I&#039;m doing the Static Structural analysis of a floating body. I performed load mapping from Aqwa to apply hydrodynamic pressures on a body and obtain stresses.<\/p>\n<p>From what I&#039;ve learned, there is no explicit boundary condition for restraining the body. Rather, Weak Springs are turned on in the Analysis Settings.<\/p>\n<p>I understand that Ansys applies weak springs in strong spots of the body to ease rigid body motion. However, it does not fully prevent rigid body motion. For example, I get total deformations of 0.5 m up to 4 m, depending on the wave. Deformations are composed by the body deformation + rigid body motion. I see this motion from the animation of the results. <\/p>\n<p>My questions are:<\/p>\n<p>1) Does this present a problem? That is, should a proper static structural analysis of a floating body present ZERO rigid body motion, or a small amount is acceptable? If so, what is &quot;acceptable&quot;?<\/p>\n<p>2) Is there a way where I can subtract the rigid body motion from the total deformation in order to only know structural deformations?<\/p>\n<p>Any insights on this would be super helpful!<\/p>\n","protected":false},"template":"","class_list":["post-158911","topic","type-topic","status-closed","hentry","topic-tag-ansys-aqwa","topic-tag-aqwa","topic-tag-floating-body-1","topic-tag-load-mapping-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_view_count":["13303"],"_bbp_likes_count":["0","0"],"_bbp_forum_subforum_count":["0"],"_btv_view_count":["2343"],"_bbp_subscription":["232918"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["158911"],"_bbp_forum_id":["27791"],"_bbp_engagement":["58821","183765","186528"],"_bbp_voice_count":["3"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["180067"],"_bbp_last_active_id":["180067"],"_bbp_last_active_time":["2021-06-08 11:43:56"]},"test":"floatingstones"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/158911","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\/158911\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=158911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}