[sergiocavaleirocosta]

Hi folks,

I am trying to create a temperature wall boundary condition that varies in the x-axis. To achieve this, I have programmed the UDF:

#include "udf.h"

DEFINE_PROFILE(temp_wall, t, i)
{
	real x[ND_ND];	/* This will hold the position vector */
	face_t f;		/* Index for each face on the boundary */
	real x0=0.1;
	real x1=0.9;
	real dx = (x1-x0);
	
	real T0=RP_Get_Float("Bilete_temp_in");
	real T1=T0 + RP_Get_Float("Bilete_dT");
	
	/* Loop over all faces of the boundary */
	Thread *th;
	
	begin_f_loop(f,t)
	{
		F_CENTROID(x, f, t);	/* Get the Global coordinates of the face*/
		/* Calculate the temperature and assign to boundary */
		
		F_PROFILE(f,t,i) = (T1-T0)/dx * x[0] + T0;
	}
	end_f_loop(f,t)
}

Furthermore, I have defined both parameters "Bilete_temp_in" and "Bilete_dT" in the "input parameters for UDF" and when I print it I get:

Input parameters available in udf side:
 --------------------  --------------------  --------------------
      parameter-name         current-value  id-to-be-used-in-udf
 --------------------  --------------------  --------------------
         "Bilete_dT"               105.73              real-16
    "Bilete_temp_in"                 616.              real-15
 --------------------  --------------------  --------------------

I also write in TUI:

(rp-var-define ‘Bilete_dT 500.0 ‘real #f)
(rp-var-define ‘Bilete_temp_in 700.0 ‘real #f)

although when I initialize my case I get:

Hybrid initialization is done.
0: unable to find rpvar 'Bilete_dT'
1: unable to find rpvar 'Bilete_dT'
2: unable to find rpvar 'Bilete_dT'
3: unable to find rpvar 'Bilete_dT'
4: unable to find rpvar 'Bilete_dT'
5: unable to find rpvar 'Bilete_dT'
0: unable to find rpvar 'Bilete_temp_in'
1: unable to find rpvar 'Bilete_temp_in'
2: unable to find rpvar 'Bilete_temp_in'
3: unable to find rpvar 'Bilete_temp_in'
4: unable to find rpvar 'Bilete_temp_in'
5: unable to find rpvar 'Bilete_temp_in'

And when I run I also get the error:

Error: WorkBench Error: Could not handle event: ParameterEvent
Error Object: #f

does anyone know why is this happening and how can I solve this issue?

Thank you all.

[AlexanderZ]

type in fluent console following command to check, if the variable was created

(rpgetvar 'Bilete_dT)

Did you run your case in parallel regime?

For parallel computation things become more complicated, you should read rpvar variable on HOST, than transfer it's value to NODES.

For more information about it read Ansys Fluent Customization manual, Parallel Considerations chapter

best regards

[luismsc]

Hi sergiocavaleirocosta,
What version of fluent are you using? Because I had a similar problem with the last version (v. 2019R1).

Regards, Luis

[sergiocavaleirocosta]

Originally Posted by luismsc

Hi sergiocavaleirocosta,
What version of fluent are you using? Because I had a similar problem with the last version (v. 2019R1).

Regards, Luis

It's the 19.0 version.
Meanwhile, It got solved modeling both solid and fluid in the same SpaceClaim and the same meshing.

[rfd]

I had similar problem. Try define in scheme variable as real (not double) example: (make-new-rpvar 'x_var 12.563 'real) and don't use capital letter in UDF RP functions example: RP_Get_Float("Bilete_temp_in")->RP_Get_Float("bilete_temp_in")