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Originally Posted by zfaraday

The error shown by checkMesh only means that you forgot to define the boundary faces in your blockMeshDict file. By the way, two questions.

First one, you forgot to define one of the arcs, well actually you have defined it in a wrong way. This is the arc going from point 15 to point 8 that you have defined it from 15 to 0.

Second question, why are you using such an amount of blocks to create a cylinder? You can do it