In ICEM CFD, the pre-mesh quality check indicates negative determinants.
When trying to visualizing the problem, the cells appear fine. If the mesh is converted to unstructured and the mesh quality is checked again it passes the determinant check and no problems are detected. Therefore,
1)Is the mesh OK?
2)If the mesh really is corrupt, what can the underlying problem be - block structure, geometry or what?
3)Please explain why pre-mesh is bad while the unstructured mesh is fine.



The reason the Pre-Mesh Quality check reports negative determinants is due to the orientation of the multi-block block topology. The pre-mesh volumes are negatively orientated, even though they appear to be orthogonal. This is just due to the block orientation and you just need to invert these blocks. You can do this in Blocking==>Block Checks==>Fix Inverted Blocks. If you recalculate the mesh then it will be OK. The unstructured hex mesh does not find these a problem.





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