[haigangwang]

I have written one udf programe about DPM,but when I hook them,it is giving me a error:P_USER_REAL(p,0): undeclared variable.Please help me!

my programe:

#include "udf.h"
#include "models.h"
#include "dpm.h"
#include "surf.h"
#include "threads.h"
#include "math.h"
#include "mem.h"
DEFINE_DPM_SCALAR_UPDATE(particle_depostion,c,t,in itialize,p)
{
int i = 0;
face_t f;
Thread *th;
real A[ND_ND];
real area=0,vol=0;
int wall_ID=4;
if (initialize)
P_USER_REAL(p, 0) = 0;
c_face_loop(c,t,i)
{
if(THREAD_ID(C_FACE_THREAD(c,t,i)) == wall_ID)
{

f=C_FACE(c,t,i);
th=C_FACE_THREAD(c,t,i);
F_AREA(A,f, th);
area = NV_MAG(A);
vol=C_VOLUME(c,t);

if(P_DIAM(p)<0.01)
{

C_UDMI(c, t, 0) +=P_DIAM(p);
P_USER_REAL(p,0) = 1.; /* "Evaporate" */

}

}
}

}

DEFINE_DPM_LAW(stop_dpm_law,p,if_cpld)
{
if (0. < P_USER_REAL(p,0))
P_MASS(p) = 0.; /* "Evaporate" */
}
DEFINE_INIT(my_init_func,d)
{
cell_t c;
Thread *t;

thread_loop_c(t,d)
{

begin_c_loop_all(c,t)
{
C_UDMI(c,t,0)=0;

}
end_c_loop_all(c,t)
}
}

[Häwimeddel]

Try to access the user memory of the particle in this way:

p->user[0] = ...

Do´t forget to enable as many user variables as you need (in your case it would be only one so far) in the UDF panel of the discrete phase model menu!

[haigangwang]

I have understood your mean.Tnanks.

Originally Posted by Häwimeddel

Try to access the user memory of the particle in this way:

p->user[0] = ...

Do´t forget to enable as many user variables as you need (in your case it would be only one so far) in the UDF panel of the discrete phase model menu!

[roopesh99]

I am using macros DEFINE_DPM_SCALAR_UPDATE. Can any one tell the means of P_USER_REAL(p,0) = P_USER_REAL(p,0) + 1.
P_USER_REAL(p,1) = 1.;
::::::::::::
some part of my UDF is
if (P_POS(p)[2]<0.03) //particle pos in z direction less then 3 cm
{
P_USER_REAL(p,1) = 0.;
}

if (P_POS(p)[2]>0.9 && P_USER_REAL(p,1) == 0.) //particle pos in z direction greater then 90 cm
{

P_USER_REAL(p,0) = P_USER_REAL(p,0) + 1.
P_USER_REAL(p,1) = 1.;
etc

[roopesh99]

Dear friend
can you tell the means of P_USER_REAL(p,0) = P_USER_REAL(p,0) + 1.
P_USER_REAL(p,1) = 1. in the macros DEFINE_DPM_SCALAR_UPDATE.

[`e`]

Originally Posted by roopesh99

can you tell the means of P_USER_REAL(p,0) = P_USER_REAL(p,0) + 1.
P_USER_REAL(p,1) = 1. in the macros DEFINE_DPM_SCALAR_UPDATE.

P_USER_REAL(p,i) is used for storing real data type values for each particle, where i is an integer for identifying each array.

Your first example increments the array of the current particle by one:

P_USER_REAL(p,0) = P_USER_REAL(p,0) + 1.;

The second example sets the second array to one:

P_USER_REAL(p,1) = 1.;

I've noticed these snippets are from my code in this thread and I've explained these macros here.