{"id":456760,"date":"2026-04-20T16:26:02","date_gmt":"2026-04-20T16:26:02","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/buoyant-object-moved-by-water\/"},"modified":"2026-04-20T16:26:02","modified_gmt":"2026-04-20T16:26:02","slug":"buoyant-object-moved-by-water","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/buoyant-object-moved-by-water\/","title":{"rendered":"Buoyant Object Moved by Water"},"content":{"rendered":"<p>&lt;p&gt;Hi&lt;\/p&gt;&lt;p&gt;I&#8217;ve been trying to make a buoyant object move by interacting with water, but it either stays static or it just drops like by the action of gravity alone. I have tried many things I&#8217;ve seen in different posts and tutorials without success and I would like to know exactly which configurations are necessary to produce the movement resulting from the solid interacting with the water.&lt;\/p&gt;&lt;p&gt;For all sims in Design Modeler I have 1 import for the domain and 1 for the buoy. I have subtracted the buoy from the domain and preserved both bodies. Also, I always use Dynamic Mesh Methods Based Remeshing and 6DOF. All relevant parts and surfaces have Boundary Conditions set as Walls except for an interior part related to the domain which is always created by default.&lt;\/p&gt;&lt;p&gt;These are the variations I&#8217;ve tried:&lt;\/p&gt;<\/p>\n<ul>\n<li>In Design Modeler I&#8217;ve created a new part made out of the 2 existing parts (domain and buoy) and kept as two bodies without making the new part.<\/li>\n<li>I&#8217;ve suppressed the buoy part in Design Modeler, and in Meshing.<\/li>\n<li>Using Fluent Watertight Meshing and Regular Meshing.&nbsp;&nbsp;<\/li>\n<li>Setting the buoy part, when it exists, as fluid and solid in the Cell Zone Conditions.<\/li>\n<li>Using Dynamic Mesh Smoothing Spring\/Laplace\/Boundary Layer and Diffusion.<\/li>\n<li>Creating 1 Dynamic Mesh Zone setting:\n<ul>\n<li>The buoy part as Rigid Body with the 6DOF Properties.<\/li>\n<li>A named selection with the buoy&#8217;s faces as Rigid Body and Deforming with the 6DOF Properties.<\/li>\n<li>A named selection with the buoy&#8217;s faces as Rigid Body and the domain (can`t remember if the body or the faces) as Deforming with the 6DOF Properties.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&lt;p&gt;I don&#8217;t know if I should change anything in the Mesh Interfaces, but I suspect that somehow what I need is to &#8220;link&#8221; the mesh from the buoy with the one from the domain so they can &#8220;move&#8221; together and produce the interaction between the solid and the water that produces the movement that their natural interaction would.&lt;\/p&gt;&lt;p&gt;I would really appreciate if you could tell me of all the settings that I tried which ones are the right ones and what it is that I&#8217;m missing.&lt;\/p&gt;&lt;p&gt;Many thanks!&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-456760","topic","type-topic","status-publish","hentry","topic-tag-6dof-1","topic-tag-dynamic-mesh","topic-tag-floating-body-1","topic-tag-fluid-solid-interaction-1"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["456760"],"_bbp_subscription":["92800","62368"],"_bbp_author_ip":["189.131.196.92"],"_bbp_last_reply_id":["457346"],"_bbp_last_active_id":["457346"],"_bbp_last_active_time":["2026-04-29 08:44:58"],"_bbp_reply_count":["6"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["92800","62368"],"_btv_view_count":["94"],"_bbp_topic_status":["unanswered"]},"test":"rnegretebecausewecan-dev"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/456760","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\/456760\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=456760"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}