Reply To: Need help in 6dof udf with a face loop

[Burhan Ibrar]

Hello sdeb thank you so much for your reply and it helped me a lot. But i have a problem where i am using overset model and now what i did that i define the motion on walls and for overset fluid domain i defined relative motion and UDF with only properties e.e mass, rotation and translation. Is this the right way to do it because when i define the same udf with motion on both then i get errors.
2nd thing is that i have attached the code below when i used my calculation for (#if !RP_HOST) and solving it parallel but in results i have variable output 6 times and every variable has a different value. If you can help me to get the one value which should be equal to the one we can see in dynamic mesh window. What i understood from manual that all variable values which i see in console are from different nodes and now i want to let them communicate so get the right value which i do not know yet.
And for writing a file with variables like time and velocity should i also use #if !RP_HOST or #if RP_NODE, etc.?
your help will really appreciated. thank you.

/*******************************************************
SDOF property compiled UDF with external forces/moments
*******************************************************/
#include "udf.h"

static real acc = 4.631;
static real mass = 5;
static real velocity, vel, area_tot, area[3];
DEFINE_SDOF_PROPERTIES(acce, prop, dt, time, dtime)
{


prop[SDOF_MASS] =5;
prop[SDOF_IXX] = 8.333e-4;
prop[SDOF_IYY] = 4.1667e-3;
prop[SDOF_IZZ] = 5.2e-5;
prop[SDOF_ZERO_TRANS_X] = False;/* boolean, allow translation in x-direction */
prop[SDOF_ZERO_TRANS_Y] = True; /* boolean, suppress translation in y-direction */
prop[SDOF_ZERO_TRANS_Z] = True; /* boolean, suppress translation in z-direction */
prop[SDOF_ZERO_ROT_X] = True; /* boolean, suppress rotation around x-axis */
prop[SDOF_ZERO_ROT_Y] = True; /* boolean, suppress rotation around y-axis */
prop[SDOF_ZERO_ROT_Z] = False; /* boolean, allow rotation around z-axis */
{
#if !RP_HOST
Thread *t;
face_t f;
Domain *domain;
int nid;
domain = THREAD_DOMAIN (DT_THREAD (dt));
nid = THREAD_ID (DT_THREAD (dt));
t = Lookup_Thread (domain, nid);

velocity=0.0;
area_tot=0;
#endif

#if !RP_HOST
begin_f_loop(f, t)
if (PRINCIPAL_FACE_P(f, t))
{
F_AREA(area,f,t);
area_tot += NV_MAG(area);
velocity += F_U(f, t)*NV_MAG(area);
}
end_f_loop(f, t)



/*area_tot=PRF_GRSUM1(noface);
velocity=PRF_GRSUM1(velocity);*/
#if RP_NODE
vel = velocity/area_tot;

Message("\nV1 %f Area Total %f /n",vel, area_tot);
#endif

#endif