[cylindrax]

I have to run a flow over a complex terrain x,z,y ( y behind the height of the domain)=( 11.6km*8.9km*3km). I am using K-epsilon realizable with a standard wall function. I have a first cell height of 0.004 m( is I physically meaningful because I use this value to get a yplus >30 et <300)
I have been asked to use an atmospheric boundary layer of 500m height on the zy plane as inlet velocity. Below are the modified code I wrote. I would like to ask if something can comment on my code:
#include "udf.h"
DEFINE_PROFILE(log_velocity,thread,index)
{
real y[ND_ND];
real x,z;
face_t f;
begin_f_loop(f,thread)
{
F_CENTROID(x,f,thread);
if y <= 500
y = x[1];
z = x[2];
F_PROFILE(f,thread,index) = 6.5*log(y/0.01)/log(10/0.01);
//Note here to express [3*log(x/0.01)/log(10/0.01)] in terms of (x,z); please get the //correct equation.
if y > 500 & y <= 3000
F_PROFILE(f,thread,index) = 10;
}
end_f_loop(f,thread)
}

[cylindrax]

#include "udf.h"
DEFINE_PROFILE(log_velocity,thread,index)
{
real x[ND_ND];
real y,z;
face_t f;
begin_f_loop(f,thread)
{
F_CENTROID(x,f,thread);
y = x[1];
z = x[2];
if (y <= 500){
F_PROFILE(f,thread,index) = 6.5*log(y/0.01)/log(10/0.01)};
if (y > 500 & y <= 3000){
F_PROFILE(f,thread,index) = 10};
}
end_f_loop(f,thread)
}


I modified it a bit, Can someone help comment

[cylindrax]

I got this error "C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.6252.0.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.7840.1.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.8496.2.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.6336.3.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.3040.4.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.10688.5.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.2772.6.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.10760.7.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.12868.8.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.14184.9.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.1712.10.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.9068.11.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.6000.12.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.5636.13.c:15: macro `THREAD_T0' used with too many (2) args
C:/Users/PINGWE~1/AppData/Local/Temp/profile1.c.15428.14.c:15: macro `THREAD_T0' used with too many (2) args"

I modified my udf to this form
#include "udf.h"
DEFINE_PROFILE(log_velocity,thread,index)
{
real x[ND_ND];
real y,z;
face_t f;
cell_t c;
Thread *tc;
begin_f_loop(f,thread)
{
F_CENTROID(x,f,thread);
y = x[1];
z = x[2];
c = F_C0(f,thread);
tc = THREAD_T0(f,thread);
y = C_WALL_DIST(c,tc);
F_PROFILE(f,thread,index) =3*log(y/0.01)/log((10)/0.01);
}
end_f_loop(f,thread)

[AlexanderZ]

F_C0(f,t)
but
THREAD_T0(t))

What are you going to do with ?

c = F_C0(f,thread);
tc = THREAD_T0(f,thread);

most likely you dont need, these macros are needed to get cell/thread adjusted to face, but you are trying to define boundaary condition (condition on face).

why do you use

y = x[1];
and
y = C_WALL_DIST(c,tc);

in the same function?

best regards

[cylindrax]

Thank you AlexanderZ for the reply.
In fact, I am trying to define a boundary condition on the face( log velocity). In the velocity component, I only want a x velocity component. Also, since I am using a RANS K-omega SST, I want the velocity profile to start from the first cell height. I don't have a lot of experience with UDF so I found a example and I tried to modify it to suit my need.