collocated grid and it's stability

mazdak · November 2, 2009, 06:13

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?

air10890 · November 2, 2009, 21:01

hi
used what kind of program?

November 2, 2009, 06:13	collocated grid and it's stability	#1
mazdak Senior Member MAZI Join Date: Oct 2009 Posts: 103 Rep Power: 17	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?

November 2, 2009, 21:01		#2
air10890 New Member choi kyung shin Join Date: Jun 2009 Location: south korea Posts: 3 Rep Power: 17	hi used what kind of program?