collocated grid and it's stability
 

Hi all.

I am writing a cod for solving turbulent 2-D channel flow using this method for each relative part
finite volume method
SIMPLE
K-E standard
standard wall function
collocated grid
Hybrid scheme

as you know for standard K-e y+ must be greater than 11.63.

when i adjust the first nodes distance fom the corresponding wall to y+ become greater than 11.63 the code go to diverging.

but when y+ is less than 11.63 it hasn't any problem.

does anyone know about this problem?

and i wanna know about treatment for V-velocity in cells near the wall.

how mus i treat for V boundary condition?

hi
used what kind of program?