DEFINE_INIT parallel udf error during solution initialization
 

hi,

I wrote a parallel udf to initialize the x, y and z velocity, for a 3D open channel flow case, using "DEFINE_INIT". Following is my code

#include "udf.h"
#include "metric.h"
#include "mem.h"
#define ymax 0.001
DEFINE_INIT(flow_field,d)
{
#if !RP_HOST
face_t f;
Thread *tf;
real x[ND_ND];
real y;
/**loop over all face threads in the domain**/
thread_loop_f(tf,d)
{
/**loop over all faces in the face thread**/
begin_f_loop(f,tf)
if PRINCIPAL_FACE_P(f,tf)
{
F_CENTROID(x,f,tf);
y=x[1];
F_U(f,tf)=(ymax+y)*(ymax-y)*48.6/(ymax*ymax);
F_V(f,tf)=0.0;
F_W(f,tf)=0.0;
}
end_f_loop(f,tf)
}
#endif
}

The code is in tact while compiling and loading. But while i am initializing the solution i am getting an error which reads
"stack backtrace generated for node id=0 (pid=17332) on signal 11"
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999999: mpt_read:error:read failed trying to read 4 bytes: Resource temporarily unavailable.
The fluent process could not be started
....

Could someone please throw some light on this issue. Your help is much appreciated

Thanks a lot
Rgds
nadesan

Hi nadesan,

Did you solve the problem?

thanks!

I am not sure whether the error is caused by but not all the face threads store U/V/W. BTW, I do not understand why nadesan did nothing about the cell values.

yep.

I have this error when I was running a very simple parallel case without any UDF.
the case can run successfully in serial, but failed parallel.