I am trying to use a UDF for velocity input in the room from a fan. I have created a UDF but when I am trying to load the UDF it shows an error stating that it is not compiled for parallel processing. Can anyone help me how to do it ? My UDF code is as follows:
#include "udf.h"
DEFINE_PROFILE(inlet_x1_velocity, thread, index)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
real z;
real Vx_s;
real r;
real r1;
real r2;
face_t f;
begin_f_loop(f, thread)
{
F_CENTROID(x,f,thread); /* en C la première position est y(0) */
z = x[1]-1.315;
y = x[2]-3.5;
r1=0.115;
r2=0.15;
r= pow(y*y+z*z,0.5);
Vx_s=7.22/0.15*r;
{F_PROFILE(f, thread, index)=Vx_s;}
}
end_f_loop(f, thread)
}
DEFINE_PROFILE(inlet_y1_velocity, thread, index)
{
real x[ND_ND]; /* this will hold the position vector */
real z;
face_t f;
begin_f_loop(f, thread)
{
F_CENTROID(x,f,thread); /* en C la première position est y(0) */
z = x[1];
F_PROFILE(f, thread, index) = -(z-1.315)*138*0.23;
}
end_f_loop(f, thread)
}
DEFINE_PROFILE(inlet_z1_velocity, thread, index)
{
real x[ND_ND]; /* this will hold the position vector */
real y;
face_t f;
begin_f_loop(f, thread)
{
F_CENTROID(x,f,thread);
y = x[2]; /* en C la première position est y(0) */
F_PROFILE(f, thread, index) = -(3.5-y)*138*0.23;
}
end_f_loop(f, thread)
}
You must link the Fluent with an external compiler on your system.
However, I recommend using an expression instead of a UDF. You can easily get the desired velocity input with a simple expression. (But only avalible on Ansys Fluent 19 and above).
To compile UDF in Ansys Fluent, you need to install visual studio. But, some version of visual studio does not match with Ansys Fluent. Try visual studio 2010
Hi Atul,
normally you need to make your UDF parallel for Fluent by using commands like:
#if !RP_HOST
...
...
...
#endif
since when computing in parallel the host node will not have any information about the mesh and other quantities and thus will lead to a error if you don't exclude it. You can read more about how to write your UDF to work in parallel in the manual, see chapter 7.3. Parallelizing Your Serial UDF.
Best of luck!
Antoni Artinov
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