UDF error
 

Hi all,

I interpreted the below udf file in Fluent.
I got parse error during interpreting.


cpp -I"C:\Fluent.Inc\fluent6.3.26/src" -I"C:\Fluent.Inc\fluent6.3.26/cortex/src" -I"C:\Fluent.Inc\fluent6.3.26/client/src" -I"C:\Fluent.Inc\fluent6.3.26/multiport/src" -I. -DUDFCONFIG_H="<udfconfig.h>" "E:\Gambit\1106VIV01\motion.c"
Error: E:\Gambit\1106VIV01\motion.c: line 3: parse error.

I could not find what is wrong with udf file.

Please leave any comments on this problem.


#include "udf.h"

static real v_prev = 0.0;

DEFINE_CG_MOTION(osc,dt,vel,omega,time,dtime)
{
Thread *t;
Domain *d = Get_Domain(1);
real x_cg[3], force[3], moment[3];
real accl, dv;
real mass = 0.2;
real wn = 12.0;
real k= mass * wn*wn;
real c = 2*mass*wn*0.00;
int i;

NV_S(vel, =, 0.0);
NV_S(omega, =, 0.0);
t = DT_THREAD(dt);
for(i=0;i<3;i++)
x_cg[i]=DT_CG(dt)[i];

Compute_Force_And_Moment(d, t, x_cg, force, moment, TRUE);
force[1] += -k*x_cg[1] - c*vel[1];

accl = force[1]/mass;
dv = accl*dtime;
v_prev+=dv;
vel[1] = v_prev;
printf("Computed force: %g \n", force[1]);
printf("Velocity: %g\n", vel[1]);
}

hi,
as the error says, the problem is with line 3. and in the udf you've post, definition of v_prev is the problem. try normal real(not static) definition. maybe fluent has some problems with static parameters!? then try renaming v_prev to vprev. all the things that could make problem is these two!
nothing else....
yours,
mohammad

Hi,
You cannot interpret such UDFs even if you will solve error (line 3). You have to compile it.

Bests,

hi,
I agree with amir.

Thank you guys.