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Segmentation fault error in User defined memory UDF

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Old   September 12, 2018, 04:09
Default Segmentation fault error in User defined memory UDF
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Hi,
I want to initialize four variables to fluent memory, but during initialization getting segmentation fault. Below is my UDF:


#include "udf.h"
#define Latent_Heat 397500
DEFINE_INIT(initialize,d)
{ cell_t c;
Thread *t;
d = Get_Domain(2); //domain ID is 2
thread_loop_c(t,d) /* Loop over all cell threads in domain */
{


begin_c_loop(c,t) /* Loop over all cells in a cell thread*/
{

C_UDMI(c,t,0) = Latent_Heat;
C_UDMI(c,t,1) = Latent_Heat;
C_UDMI(c,t,2) = 1.0;
C_UDMI(c,t,3) = 1.0;
C_UDMI(c,t,4) = 1.0; /* Liquid region */
}
end_c_loop(c,t)

}
}

Thanks
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Old   September 12, 2018, 23:16
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You should check the pointer before deference it.

Code:
#include "udf.h"



 #define Latent_Heat 397500
DEFINE_INIT(initialize,d)
{
    cell_t c;
    Thread *t;
    d = Get_Domain(2); //domain ID is 2
    thread_loop_c(t,d) /* Loop over all cell threads in domain */
    {

        if (FLUID_THREAD_P(t) && NNULLP(THREAD_STORAGE(t, SV_UDM_I)))
        {
            begin_c_loop(c,t) /* Loop over all cells in a cell thread*/
            {

                C_UDMI(c,t,0) = Latent_Heat;
                C_UDMI(c,t,1) = Latent_Heat;
                C_UDMI(c,t,2) = 1.0;
                C_UDMI(c,t,3) = 1.0;
                C_UDMI(c,t,4) = 1.0; /* Liquid region */
            }
            end_c_loop(c,t);
        }

    }
}

However, generally people do not use
Code:
DEFINIE_INIT
in the way as you do.
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Old   September 13, 2018, 01:58
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Hi,
Thank you for your response, the macros is define in the UDF manual as the way I defined(Ref. UDF Manual November 2013, ANSYS Release 15, P-26).

I want to save the previous time step values for liquid fraction as C_UDMI, so that I can access those values during the calculation. As you said the way I defined is not the way defined, so What are the other options to define DEFINE_INIT?
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Old   September 13, 2018, 03:17
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For your purpose

Code:
DEFINE_EXECUTE_AT_END
is more appropriate.
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segmentation fault, solidification/melting, udf, udmi

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