General mesh quality criteria
I'm new to NUMECA and was wondering if someone could give me a general guideline as to what values should be attained or not to be exceeded regarding the orthogonality, expansion and aspect ratio. I'm currently simulating a KKK K27 compressor, but it seems that the b2b mesh quality at the hub is rather poor because of the large hub fillet (1.85mm). If the best mesh quality that I can attain still does not satisfy the minimum requirements is there any other way I could improve the mesh quality even if it means altering the geometry slightly.
Any help will be greatly appreciated.
The quality of mesh is the most important issue that you have to consider, in fact, it leads you to a better accuracy. Before looking at the orthogonality, first you would need to make sure there will not be a single negative cell. Then the range of expansion ratio and aspect ratio should be followed accordingly and lastly you should look into the orthogonality.
If you have difficult to obtain a better quality of mesh that you expected, you should alter the geometry of hub and/or shroud by expanding in Z direction.
I hope this is useful.
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