[sidkamat]

Hi. I am trying to add an additional force on the tracked particle in the DPM. I am getting the error "TP_POS: undeclared variable" for the following UDF:

/*UDF for calculating DEP force*/
#include "udf.h"
#include "dpm.h"
#include "dpm_types.h"
#define pi 3.141592
/*Define parameters*/
#define km 1.0
#define epsilon 8.85e-12
#define D 1.0e-6
#define L 10.0e-6
#define alpha 1130
#define V 7000
#define R2 1.111/100
#define R1 0.794/100
DEFINE_DPM_BODY_FORCE(DEP,tp,i)
{
real beta=L/D;
real xi=beta/sqrt((beta*beta-1));
real c1=atan(xi);
real f=xi*((1-xi*xi)/c1+xi);
real Fd=0;
if(TP_POS(tp)[0]>=0.366)
{
Fd= (-1*pi*km*epsilon*D*D*L/6)/(alpha/(alpha-1)-f)*(V/log(R2/1))*(V/log(R2/1))*1/TP_POS(tp)[1];
}
else
Fd=0;
return(Fd/P_MASS(tp));
}

Can anyone identify what is wrong?

[AlexanderZ]

try P_POS instead of TP_POS, compile code