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-   -   I need urgent help about Phoenics 3.5 Hope to see him/her (http://www.cfd-online.com/Forums/phoenics/64617-i-need-urgent-help-about-phoenics-3-5-hope-see-him-her.html)

Filizka May 17, 2009 03:14

I need urgent help about Phoenics 3.5 Hope to see him/her
 
Hi to all!

I am so new at Phoenics 3.5 and I need help about my questions :
All my questions are 2D.

1) Geometry > Grid Mesh Settings > X direction settings > Power law
independing on what I have to decide about Power Law here?


Time by time I will add my other questions starting from 2)

Thanks from now on

Koolifant May 18, 2009 04:22

Quote:

Originally Posted by Filizka (Post 216385)
Hi to all!

I am so new at Phoenics 3.5 and I need help about my questions :
All my questions are 2D.

1) Geometry > Grid Mesh Settings > X direction settings > Power law
independing on what I have to decide about Power Law here?

The power law/geom prog can be used to refine the grid locally, so that you dont need a fine grid in the whole domain, but only in regions with e.g. high velocity gradients. As far as i know, you can freely change the coeff. of the power law as long as the size of adjacent cells do not differ to much. Values i found for this in literature give a max factor of 1.4 for the size difference for adjacent cells. So
(1.4^-1) < (x-dimension cell 1)/(x-dimension cell 2) < 1.4
ans the same goes for y and z.

Good luck
PS: why do you use such an old version of phoenics?? Current version is phoenics 2008.

Filizka May 21, 2009 13:34

Thank you very much for your help Koolifant ,
that really helped me.
and about your question I use that much old version of Phoenics because my collage has this one because they have a class license and thats probably connected with the cost.

Take care and again thanks for your answer


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