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Old   October 30, 2013, 12:04
Default Udf segmentation violation
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Leonidas Siozos-Rousoulis
Join Date: Jan 2013
Location: Brussels, Belgium
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Hello people,

I'm trying to write down a simple UDF which will calculate the pressure time derivative for each cell and time step and will also assign a zero value to the z velocity. The pressure time derivative and z-velocity value will also be saved as two new variables.
I managed to compile and hook the function. However, when running the calculation I always get a SEGMENTATION VIOLATION and the simulation is terminated.

The UDF I have coded is the following:

#include "udf.h"
#include "mem.h"

Thread *t;
cell_t c;
real p1, p2, dt=0.05;

/* Read pressure from previous and second previous time steps */
p1 = C_P_M1(c,t);
p2 = C_P_M2(c,t);
C_UDMI(c,t,0) = (p1 - p2) / (dt);

/* Assign value zero to uz */
C_UDMI(c,t,1) = 0.;

Should I have looping in cells and threads?
I tried without the loops and still have the same problem.

Additionally, I am running in parallel. Might the code need to be parallelized?

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