{"id":456589,"date":"2026-04-16T20:08:06","date_gmt":"2026-04-16T20:08:06","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/remeshing-and-dynamic-meshing-not-remeshing\/"},"modified":"2026-04-16T20:08:06","modified_gmt":"2026-04-16T20:08:06","slug":"remeshing-and-dynamic-meshing-not-remeshing","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/remeshing-and-dynamic-meshing-not-remeshing\/","title":{"rendered":"Remeshing and Dynamic Meshing not Remeshing"},"content":{"rendered":"<p>&lt;p&gt;Hi all,&lt;\/p&gt;&lt;p&gt;I am making a&nbsp; 3D dynamic mesh in ansys fluent, where a solid wall is prescribed with &#8220;rigid body motion&#8221; from a UDF. The mesh is a hybrid structured\/unstructured grid, and the walls with the rigid body motion are moving. The timestep size is approporiate for the first 3 iterations, however the interior mesh does not deform so a negative cell volume is produced. When I saw this <a href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-3d-dynamic-mesh-not-remeshing-or-smoothing\/\">post<\/a>, I saw that I needed to prescribe the interior to deform but this did not work&#8230; Do you have suggestions on how to proceed? As always, thank you so much for your patience. I have attached the mesh settings below and the pic of the mesh right before a negative cell volume is produced.&nbsp; &lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/16-04-2026-1776369068-mceclip0.png\" width=\"451\" height=\"472\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/16-04-2026-1776369088-mceclip1.png\" width=\"290\" height=\"474\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/16-04-2026-1776369107-mceclip2.png\" width=\"576\" height=\"470\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/16-04-2026-1776369138-mceclip4.png\" width=\"536\" height=\"468\" \/><img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/16-04-2026-1776369120-mceclip3.png\" \/><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2026\/04\/16-04-2026-1776369694-mceclip5.png\" width=\"1031\" height=\"662\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-456589","topic","type-topic","status-publish","hentry","topic-tag-fluent-cfd-ansys-1","topic-tag-dynamic-mesh"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["456589"],"_bbp_subscription":["295638"],"_bbp_author_ip":["128.61.187.37"],"_bbp_last_reply_id":["0"],"_bbp_last_active_id":["456589"],"_bbp_last_active_time":["2026-04-16 20:08:06"],"_bbp_reply_count":["0"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["1"],"_bbp_engagement":["295638"],"_btv_view_count":["30"],"_bbp_topic_status":["unanswered"]},"test":"zoelle-wonggatech-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/456589","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\/456589\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=456589"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}