[RCamp]

Hi everyone,

I am working on a body force UDF right now and am having some trouble. I am pretty new to programming so it may be something very simple but I keep getting an error that says

"Contact_force_body_force.c(13): error C2109: subscript requires array or pointer type
Contact_force_body_force.c(18): error C2109: subscript requires array or pointer type"

I am a little confused by this because I thought the tp was the pointer and that the i should be Cartesian coordinates already build in. Can someone help out?

My code is:

#include "udf.h"

#define TSTART 5.0 /* field applied at t = tstart */

DEFINE_DPM_BODY_FORCE(particle_body_force,tp,i)

{ real bforce=0;
real deltaV=0;
if(TP_TIME(tp)>=TSTART)
{
if(i==0)
{
deltaV= TP_VEL(tp)[0]-TP_VELO(tp)[0];
bforce=TP_Mass(tp)*deltaV;
}
else if(i==1)
{
deltaV= TP_VEL(tp)[1]-TP_VELO(tp)[1];
bforce=TP_Mass(tp)*deltaV;
}
else
{
deltaV=0;
bforce=0;
}
}
}

[AlexanderZ]

change

real deltaV=0;

to

real deltaV[3];

velocity is a vector not scalar

best regards

[RCamp]

The ultimate answer to this for anyone with a similar problem was to take out deltaV and just use that equation directly in my bforce.

After that the only issue was I was using a O instead of a zero.