{"id":430141,"date":"2025-04-28T03:08:30","date_gmt":"2025-04-28T03:08:30","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-cell-volume-detected-5\/"},"modified":"2025-04-28T03:08:30","modified_gmt":"2025-04-28T03:08:30","slug":"negative-cell-volume-detected-5","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/negative-cell-volume-detected-5\/","title":{"rendered":"Negative cell volume detected"},"content":{"rendered":"<p>&lt;p&gt;Currently, both the fluid domain and the structural domain use SWEEP to generate meshes. The hydraulic diameter is 0.05m, the flow rate is 1m\/s, and the model uses 2.5D. However, the negative volume problem did not occur when using the 3D model before. The information I consulted said that the mesh should be reduced. Currently, the mesh is 2mm\/1mm. The time step has been reduced to 1e-05. The structural Young&#8217;s modulus is 1E+07, the density is 800, and the Poisson&#8217;s ratio is 0.35. There are still structural problems. Is there any other way to solve this problem when the above errors occur? Thank you&lt;\/p&gt;&lt;p&gt;<img decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/04\/28-04-2025-1745809652-NEGA.jpg\" alt=\"\" \/>&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-430141","topic","type-topic","status-publish","hentry","topic-tag-2-way-coupled-fsi","topic-tag-2-way-fsi","topic-tag-system-coupling-error"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_forum_id":["27792"],"_bbp_topic_id":["430141"],"_bbp_subscription":["491544","805"],"_bbp_author_ip":["59.125.78.142"],"_bbp_last_reply_id":["430203"],"_bbp_last_active_id":["430203"],"_bbp_last_active_time":["2025-04-28 13:47:22"],"_bbp_reply_count":["1"],"_bbp_reply_count_hidden":["0"],"_bbp_voice_count":["2"],"_bbp_engagement":["491544","805"],"_btv_view_count":["256"],"_bbp_topic_status":["unanswered"]},"test":"1f7a2b4b2266cd3ea377374d79e788702db8097b"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/430141","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\/430141\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=430141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}