{"id":368607,"date":"2024-05-26T04:29:48","date_gmt":"2024-05-26T04:29:48","guid":{"rendered":"\/forum\/forums\/topic\/dynamic-mesh-negative-cell-zone-detected\/"},"modified":"2024-05-26T04:29:48","modified_gmt":"2024-05-26T04:29:48","slug":"dynamic-mesh-negative-cell-zone-detected","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/dynamic-mesh-negative-cell-zone-detected\/","title":{"rendered":"Dynamic Mesh – Negative Cell Zone Detected"},"content":{"rendered":"

Dear all,<\/p>\n

I am simulating a car passing at 10m\/s (dynamic mesh) and induce wind on the S-type wind turbine (dynamic mesh with 6DOF), as shown below. <\/p>\n

My mesh is having hexagonal meshes with sizing of 4mm inside the turbine circle, 5mm out of it, and inflation layers in both blades and cars.<\/p>\n

Ortrhogonal quality is > 0.6<\/p>\n

Error popped up with “Error: Update-Dynamic-Mesh failed. Negative cell volume detected. Error Object: #f”<\/p>\n

I have two questions would like to seek for some directions and solutions:<\/p>\n

    \n
  1. I spot the extension and compression of cells when the car is moving to the right, I am thinking if the error is caused by continuous entension and compression of the cells, making it skew in shape and cause negative cell volume. I have activated the remeshing methods, but still unable to solve.<\/li>\n
  2. As the 6DOF motion of turbine is passive, usually set with layering and diffusion for rotation motion, while the linear motion of car some suggest deselect layering and use spring\/laplace\/boundary layer. While only one setup is allowed in the GUI, Can I just go for all mesh methods and diffusion for the whole case?<\/li>\n<\/ol>\n

    Note: I ran a trial setting the car just as a wall object without motion, and inlet with some wind, the turbine is able to rotate without errors.<\/p>\n

    <\/p>\n

    <\/p>\n

        <\/p>\n

    <\/p>\n

    <\/p>\n","protected":false},"template":"","class_list":["post-368607","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["187526","13659"],"_bbp_author_ip":["23.216.133.155"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["487"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["368607"],"_bbp_forum_id":["27792"],"_bbp_engagement":["13659","187526"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["369068"],"_bbp_last_active_id":["369068"],"_bbp_last_active_time":["2024-05-29 13:58:55"]},"test":"jasonsum"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/368607","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\/368607\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=368607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}