| keishlaortiz |
April 9, 2019 13:30 |
UDF for recycling particles by changing its positions
1 Attachment(s)
Hello!
I'm trying to recycle particles escaped from outlet to inlet. I followed and modified the UDF posted in this thread: https://www.cfd-online.com/Forums/fl...dpm-udf-2.html. In my case, if the particle x-position is greater than 0.20 m and y-position is greater than or equal to -0.42 m, then the particle is close to the outlet and I want to change the position such that is re-injected into the inlet. However, it seems like this approach is not working since the particles get stuck at the outlet. Here is my UDF:
Code:
#include "udf.h"
DEFINE_DPM_BC(continue_tracking,p,t,f,f_normal,dim)
{
//here we want to keep track of the particle that reaches the outlet so we can "recycle" it
return PATH_ACTIVE;
}
DEFINE_DPM_SCALAR_UPDATE(recycle_particles,c,t,initialize,p)
{
FILE *fp;
if (P_POS(p)[1] > 0)
{
P_USER_REAL(p,1) = 0.;
}
if (P_POS(p)[1] >= -0.42 && P_POS(p)[1] < 0 && P_POS(p)[0] > 0.20 && P_USER_REAL(p,1) == 0.)
{
// save particle id and time to a file
Message("The outlet boundary UDF is being called...\n");
fp=fopen("recycleparticles.txt", "a"); // x, y, z particle positions [m], particle ID [#] and time [s]
//fprintf(fp,"%e %e %e %d %e\n",P_POS(p)[0],P_POS(p)[1],P_POS(p)[2],p->part_id,P_TIME(p));
fprintf(fp,"%d %e\n",p->part_id,P_TIME(p));
fclose(fp);
// save the number of times this particle has been recycled
P_USER_REAL(p,0) = P_USER_REAL(p,0) + 1.;
P_USER_REAL(p,1) = 1.;
// send particle to the inlet boundary
// just need to change y-position
P_POS(p)[1] = 2.6534e-017;
}
}
I also attached a zip file containing the workbench file, geometry file and udf code. If anyone can help me with this it would be appreciated. |
