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-   -   Can y+ be much smaller than 1 for... (http://www.cfd-online.com/Forums/fluent/28540-can-y-much-smaller-than-1-a.html)

Rodrigo Madariaga May 18, 2001 18:43

Can y+ be much smaller than 1 for...
 
Before meshing my Spalart Allmaras NACA 0012 airfoil, I calculated the y for y+=1 for the 2 layer model.

After the simulation I plotted y+ and obtained values as low as 0.1 My question is if's alright to keep using this mesh (is there an induced error or something that can go wrong)

I saw the Fluent manual but it does'nt say anithing about y+<<1

John C. Chien May 18, 2001 19:42

Re: Can y+ be much smaller than 1 for...
 
(1). Well, if your mesh size is fixed, then shifting the mesh distribution to the wall will make the mesh coarser in other part of the boundary layer,right?

Chetan Kadakia June 7, 2001 23:32

Re: Can y+ be much smaller than 1 for...
 
Does y+ adaption shift the mesh or just refine the mesh near the boundary?


Chetan Kadakia June 7, 2001 23:38

Re: Can y+ be much smaller than 1 for...
 
I think y+ can be smaller than one... see Kays and Crawford, Convective Heat and Mass Transfer page 201 to 202. y+ = yu(tao)/mu... Let me know what you find.


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