[IvanCFD]

Hi,

I've checked many times that what there is in that journal file is what I want Fluent to pick up...

What I'm gonna do is to smash both the .cas and .dat files and start over. I'll even delete the folder where they're located.

I haven't run your script because I don't understand the meaning of
13 () no pressure () no
I'll let you know where I end up.

[dmoroian]

Originally Posted by IvanCFD

Hi,

I've checked many times that what there is in that journal file is what I want Fluent to pick up...

What I'm gonna do is to smash both the .cas and .dat files and start over. I'll even delete the folder where they're located.

I haven't run your script because I don't understand the meaning of
13 () no pressure () no
I'll let you know where I end up.

Before you continue with your gui script, try to type in the text interface:

/file/export

then you will understand the meaning of the entire command from above.
The GUI record macro was just a pedagogical exercise.

[IvanCFD]

I know what you mean.

Well it doesn't seem to work either.

I've created the journal file attached to this post, following your instructions ad you'll be able to see. However, I keep getting the same error message related to out of malloc memory (see picture attached).

On the other hand, just to see if that malloc memory issue could be solved somehow, I'm running a single precision simulation based on the same case and it seems to work.

I don't know what else I can do.

Do you have idea how many extra iterations per time step I have to run compared to a double precision case?

Cheers,

Ivan.

[dmoroian]

The journal file looks ok, at first glance. Most likely there is something wrong with the case file.
You could ask fluent support for that error.
I don't think it matters how many iterations you run in single precision, if both calculations are converged, the double precision should always be more accurate. However, the difference may sometimes be insignificant.

[DarrenC]

HI dmoroian

I am having a slightly different problem and I was wondering if you know of any other way around it. I need to monitor approximately 5000 points in my simulation per time step.

1.Surface point monitors do not work as they crash due to too many individual points

2. I tried file/transient-export TUI, this works in my PC. But when I load the simulation into a cluster, it does not give me the option to write it into 'ascii' format. Further investigation points out that Fluent Parallel dosent support transient-export in 'ascii' format.

Do you have any idea how else I can monitor so many individual points??

Thanks in advance.

[dmoroian]

void mapCell(real *x, cell_t *cell, Thread **thread)
{
   Domain *d = Get_Domain(1);
   Thread *t;
   cell_t c;
   real centroid[ND_ND];
   real dist2[ND_ND];
   real min = 1.0e6;

   thread_loop_c(t,d)
   {
      begin_c_loop(c,t)
      {
         C_CENTROID(centroid,c,t);
         NV_VV(dist2,=,centroid,-,x);
         if (min > NV_MAG2(dist2))
         {
            min = NV_MAG2(dist2);
            *cell = c;
            *thread = t;
         }
      }
   }
}

DEFINE_EXECUTE_AT_END(bubu)
{
   static cell_c *mapCells = NULL;
   static Thread **mapThreads = NULL;
   static real points[5000][3] = {{0,0,0},{1,1,1}......};/*this is the vector defining the monitoring points*/
   int i;
   char name[100];
   
   if(NULL == (mapCells = (cell_c*)calloc(5000,sizeof(cell_c))))
      Error("Could not allocate the memory!\n");
   if(NULL == (mapThreads = (Thread**)calloc(5000,sizeof(Thread*))))
      Error("Could not allocate the memory!\n");
   
   for(i = 0; i < 5000; i++)
   {
      mapCell(points[i], &mapCells[i], &mapThreads[i]);
      sprintf(name,"m-%05d.out",i);
      pf = fopen(name,"a");
      fprintf(pf,"%f\n",C_T(mapCells[i],mapThreads[i]));
      fclose(pf);
   }   
}

I didn't know about the limitation with the high number of monitors. So here it is an example using an udf.
Take the above code as it is "just an example". I did not try it, it is not optimized, nor it correctly works in parallel.
Basically it finds the corresponding cell for each monitor and prints out the temperature in a separate file.

I hope this is helpful!