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 zwdi February 9, 2004 13:32

3d velocity profile

Hello Everyone,

Did anybody know adding 3d UDF velocity profile of Ux= 0.06*pow(10*y,0.13), Uy=Uz=0 to Fluent6.1? It is the boundary layer profile (power law). For 2d I am OK. But for 3D, things seem very complicated for me. I could not figure it out. Could somebody help me out? Thanks in advanced.

Zwdi

 zwdi February 10, 2004 11:58

help on 3d velocity profile

Could anybody help me on this topic? Thanks a lot

Zwdi

 ap February 10, 2004 15:26

Re: 3d velocity profile

It's just the same as in 2D. You just need to know that in the cell centroid vector, x is in position 0, y is in position 1 and z is in position 2.

The function should be the following. Hook it in FLUENT BC panel to your inlet, in the x-velocity box.

DEFINE_PROFILE(my_Ux, t, i)
{
cell_t c;
real x[ND_ND];
real y;

begin_c_loop (c,t)
{
C_CENTROID(x,c,t);
y =x[1];
F_PROFILE(c,t,i) = 0.06*pow(10*y,0.13);
}
end_c_loop (c,t)
}

Hi :)

ap

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