Learning Forum

[sam_5195]

Hi, it may be a beginner's question but i would like to know that what is the definitive criteria for determining mesh quality. I mean the average orthogonal mesh quality(mesh metric) of the generated mesh is 0.741 with the average skewness of 25 and max 48 but the minimum orthogonal mesh quality(solver -> Report quality) is 8e-02. So the problem is to know whether it's bad mesh or a good mesh. Thanks

[Keyur Kanade]

Hi,

If you are doing fluid meshing then please make sure that minimum orthogonal quality is more than 0.1. 

The mesh with minimum orthogonal quality below 0.1 is not good. 

Regards,

Keyur

Also, please like the answers which have helped you move forward and in the end, once your issue is resolved, please mark the most appropriate solution (most useful advice) as 'Is Solution'. This will help others who are using this thread to find answers to similar questions.

 

[Pablo Aguado]

Hi,

I would give priority to the minimum and maximum values rather than to average. This is because implicit solving can lead to solution divergence in just a few cells, those with poorest quality. For instance, minimum orthogonal quality recommended is 0.1 and maximum skewness is 0.9. You can have high average values of orthogonal quality (or low average value of skewness) but if you have some cells with very low orthogonal quality the solution may diverge.

 

[btingthewind]

Thank you, KKANADE.

But, how to improve the orthogonal quality when it's fairly low?

BEST Regards.

[Rob]

As you've (quite rightly) opened a new topic I'll lock this one. 

[pedramsamieyan]

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[Vivjk94]

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When you see mesh metric, try to locate the group of cells with low orthogonal quality and then apply edge sizing or inflation at the spot where the the low orthogonal quality cells lie.

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