[asking]

Hi,

I am having problems when I retrieve stored values using F_UDMI in parallel mode. A couple of nodes have zero value when I restart the simulation.

I run my model and UDF for 5 seconds. The UDF calculates some values and store them using F_UDMI. After the simulation finished, I save the last time step. I close FLUENT and I open again the saved file. When I restart the simulation, the UDF retrieves the previously stored values the same way they have been stored. Here are the results.

Last saved time step

OUT I am in the host process
TESTout Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021 
OUT I am in the node process with ID 0
TESTout Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021 
OUT I am in the node process with ID 1
TESTout Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021 
OUT I am in the node process with ID 2
TESTout Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021 
OUT I am in the node process with ID 3
TESTout Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021 
OUT I am in the node process with ID 4
TESTout Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021 
OUT I am in the node process with ID 5
TESTout Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021

Intial time step after restarting the simulation (retrieving the stored values)

INI I am in the host process
TESTini Position: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 
INI I am in the node process with ID 0
TESTini Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021 
INI I am in the node process with ID 1
TESTini Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021 
INI I am in the node process with ID 2
TESTini Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021 
INI I am in the node process with ID 3
TESTini Position: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 
INI I am in the node process with ID 4
TESTini Position: 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 
INI I am in the node process with ID 5
TESTini Position: 0.000408 0.014459 0.325915 0.000000 0.000003 0.000021

It seems that the values are being correctly stored when the simulation starts from 0 seconds. Unfortunately, nodes 3 and 4 do not retrieve the correct values (all of them are zero). This produces significant differences in the values as the simulation continues.

I store the values using:

#if !RP_HOST
Thread *t;
Domain *d = Get_Domain(1);
face_t f;
t = Lookup_Thread(d,zoneID);

begin_f_loop(f,t)
{
if (PRINCIPAL_FACE_P(f,t))
{
	F_UDMI(f,t,0) = vxRK;
	F_UDMI(f,t,1) = xRK;
	F_UDMI(f,t,2) = vyRK;
	F_UDMI(f,t,3) = yRK;
	
	F_UDMI(f,t,4) = x;
	F_UDMI(f,t,5) = vx;
	F_UDMI(f,t,6) = ax;
	F_UDMI(f,t,7) = y;
	F_UDMI(f,t,8) = vy;
	F_UDMI(f,t,9) = ay;
	}
}
end_f_loop(f,t)
#endif

I access them using:

if (load_ini_UDMI_time < ctime)
{
#if !RP_HOST
Thread *t;
Domain *d = Get_Domain(1);
t = Lookup_Thread(d,zoneID);
face_t f;

begin_f_loop(f,t)
{
if (PRINCIPAL_FACE_P(f,t))
{

	vxRK = F_UDMI(f,t,0);
	xRK = F_UDMI(f,t,1);
	vyRK = F_UDMI(f,t,2);
	yRK = F_UDMI(f,t,3);
	
	x = F_UDMI(f,t,4);
	vx = F_UDMI(f,t,5);
	ax = F_UDMI(f,t,6);
	y = F_UDMI(f,t,7);
	vy = F_UDMI(f,t,8);
	ay = F_UDMI(f,t,9);
	}
}
end_f_loop(f,t)
#endif
}

if (load_ini_UDMI_time < ctime) activates only in the first timestep.

I do not understand why when I access to the stored values they are zero on nodes 3 and 4. If anyone knows how to solve it or has a better alternative I would be really thankful.

Regards,