{"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

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    <\/p>\n","protected":false},"template":"","class_list":["post-368607","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t