In my model I deal with a 3-degree combustor chamber sector geometry, therefore the region at the symmetry axis is very problematic for meshing. I've tried to creare there cells of different sizes, but it doesn't help: error message about collapsed cell faces keep appearing. (However, the cells look 'uncollapsed'.) Maybe I shouldn't pay attention to this messages?
Re: Collapsed cells
you have to vmerge the vertices at the center. Check face collapsed cells, then cfix them.
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