[aestas]

Hello friends
I defined C_UDMI(c,t,0) in my udf for the whole area, but on the boundary, i need to use the face value of UDM 0 to define my boundary profile.

If C_UDMI(c,t,0) has been defined, can i directly use F_UDMI(c,t,0)?

if not, can i use this form?(can i replace F_UDMI(c,t,0) to C_UDMI(c,t,0) at the boundary by this method?)

DEFINE_PROFILE(example,t,i)
{
face_t f;
cell_t c0=-1;
Thread *t0=NULL;
begin_f_loop(f,t)
{
c0=F_C0(f,t);
t0=F_C0_THREAD(f,t);
F_PROFILE(f,t,i)=C_UDMI(c0,t0,0);
}
end_c_loop(f,t)
}

[`e`]

You've started your loop with "begin_f_loop" and ended this loop with "end_c_loop"; you should end with "end_f_loop" instead.

Your logic of setting a boundary profile based on the adjacent cell UDM sounds fine. Have you tried running this UDF?

[aestas]

Originally Posted by `e`

You've started your loop with "begin_f_loop" and ended this loop with "end_c_loop"; you should end with "end_f_loop" instead.

Your logic of setting a boundary profile based on the adjacent cell UDM sounds fine. Have you tried running this UDF?

well, i have corrected it in my udf, and run it. No error occurred, the boundary condition can be used in UDF, but right now i cannot figure out whether it is right or wrong.

[`e`]

If you want to check if the code is working you need to compare the face values with the adjacent cells. Perhaps first apply a non-uniform distribution of UDM adjacent to the boundary (with a quick DEFINE_ON_DEMAND; as a function of position) and run the boundary profile (either initialise your simulation or run a time step). Lastly, visualise the boundary face and adjacent cells in Fluent or CFD-Post.

[aestas]

Originally Posted by `e`

If you want to check if the code is working you need to compare the face values with the adjacent cells. Perhaps first apply a non-uniform distribution of UDM adjacent to the boundary (with a quick DEFINE_ON_DEMAND; as a function of position) and run the boundary profile (either initialise your simulation or run a time step). Lastly, visualise the boundary face and adjacent cells in Fluent or CFD-Post.

Sounds great!Thank you my friend! I will try this