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-   -   Meaning of Ychar and Ypmma (http://www.cfd-online.com/Forums/openfoam-pre-processing/112252-meaning-ychar-ypmma.html)

aylalisa January 24, 2013 13:44

Meaning of Ychar and Ypmma
 
Dear All,

I try to setup a case with three meshes and would like to use chtMultiRegionFoam.

Does anybody know the exact meaning of these values located in the '0' time folder of a case.
Have these values something to do with the y+ value, that must be defined for the resolution of the boundary layer, depending on the kind of flow problem.

These values don't have any entities. Therefore they could be dimensionless sizes.

What is the difference between them and the exakt meaning of the indizes 'char' and 'pmma'?

I've found a couple of threads with the same question, but according to my search results, none of them was answered :(.

Hope for response!
Thanks two all who try to help!!!

Lisa

Ahmed Khattab February 20, 2013 07:18

Quote:

Originally Posted by aylalisa (Post 403843)
Dear All,

I try to setup a case with three meshes and would like to use chtMultiRegionFoam.

Does anybody know the exact meaning of these values located in the '0' time folder of a case.
Have these values something to do with the y+ value, that must be defined for the resolution of the boundary layer, depending on the kind of flow problem.

These values don't have any entities. Therefore they could be dimensionless sizes.

What is the difference between them and the exakt meaning of the indizes 'char' and 'pmma'?

I've found a couple of threads with the same question, but according to my search results, none of them was answered :(.

Hope for response!
Thanks two all who try to help!!!

Lisa

Hi lisa,
I met dame problem before with the same solver.but no one answered me. afer some search i found that these values may be the contribution of two different species in the solid region.
Please share any other answer if you meet any answer in you way.
Good luck :)

Bloerb October 20, 2013 05:49

Has anyone found out what these values are? I'm struggling with finding an explanation.


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