cg-motion vs 6dof udf
 

hi every one,
i want to simulate moving object inside a barrel by patching high pressure and tempreture ,
i used a 6dof udf and set prop[SDOF_MASS] = 0.4
and so i tried to check the moving by using cg-motion udf
that calculate the force and solve second law for motion:
force = 0.0;
begin_f_loop (f, t)
{
F_AREA (A, f, t);
force += 2*M_PI*F_P (f, t) * NV_MAG (A);
}
end_f_loop (f, t)
/* compute change in velocity, i.e., dv = F * dt / mass velocity update using explicit Euler formula */
dv = dtime * force / .4;
v_prev += dv;
/* set x-component of velocity */
vel[0] = v_prev;


but when i checked the velocities at the same position for example
@ x=.2
vel object (6dof)=286
vel object (cg_motion)=86

any one know why???
thanks a lot
http://uupload.ir/files/0la5_untitled.jpg

any comment ???
thank you