Learning Forum

[Gu Xuan]

I would like to use UDF to obtain the surface incident radiation or radiation intensity (W/m2) of walls. I wrote a code as below. But it is not correct. I think that maybe RADIATION_INTENSITY is not correct. Could you help me to modify the code? Thank you very much!

F_STORAGE_R(f,t,SV_WALL_RADIATION_INTENSITY)

[Luca B.]

RADIATION_INTENSITY is not a valid Macro. I suggest yuu to control the list of possible macro inside Fluent Customization Manual  .

If you cannot recover the expected value, you can consider to store it into an User-Defined Memory (UDM) Macros ( Chapter 3.2.12.). In this way you can have access to this variable and resuse it inside your UDF

Luca

[Gu Xuan]

Thank you for reply.

May I ask a question?

How to use Fluent Customization Manual  ?

When I click "GET SUPPORT"(Photo 1), I alsways stay this homepage (Photo 2).

Photo 1:

 

Photo 2:

 

[Rob]

Click on Help in Fluent and then paste the link into the browser that opens. 

[Gu Xuan]

Thank you for your reply.

I got it.

May I ask another question?

According to Fig.,  if I am unsure whether a particular problem can be handled using a UDF, how did I contact my technical support engineer for assistance?

Looking forward your reply.

[Rob]

If you're a Student or other Academic User then we're it, and we're unable to go into much detail on a public forum. Commercial customers can (usually) contact the local office for direct support. 

Looking at the above, I do know that some of the radiation macros are model dependent, so whilst they may return a value for another model you may want to check other F_STORAGE terms. 

[Gu Xuan]

Thank you for your reply.

Is "the local office " the company in which I bought the software?

I would like to know how to use UDF to obtain the variable (surface incident radiation) in the contour. Please see the figure.

I tried many codes such as SV_DO_IRRAD, SV_DO_IRRAD_SHELL, SV_DO_IRRAD_OLD, SV_DO_IRRAD_TMP, etc.

But they are not correct.

Could you please share the correct code with me?

[Rob]

Local office is the Ansys office in your area/timezone. I can't see where you are (which is intentional) so can't advise. Note, Ansys are an American company so "local" can be an interesting concept..... 

Checking with a colleague re the macro. If you dump the values to a Facet UDM it should be possible to compare values. 

[Rob]

Not quite that simple as it's not a scalar macro. However, you may find something here  /knowledge/?s=radiation  

[Gu Xuan]

Thank you for your reply.

>Local office is the Ansys office in your area/timezone. I can't see where you are (which is intentional) so can't advise. Note, Ansys are an American company so "local" can be an interesting concept..... 

I am in Japan. Could you give me some advice?

>Not quite that simple as it's not a scalar macro. However, you may find something here  /knowledge/?s=radiation  

I learned the case provided by the URL.

These materials give me much help.

But I have some questions.

F_DO_QA(f,t,nb), what is the meaning of nb.  i is the direction. I understand it. 

Could you share more materials or cases about this question? I have already searched for a long time. But no useful information.

Looking forward to your reply.

[Rob]

University or commercial user? Your supervisor/Ansys contact will know if there any arrangements in place. 

I don't know what "nb" is, but as it's the DO model it could be a grey band ID. If you have a look in the header file(s) there might be more information. As I'm Ansys staff I'm unable to offer any assistance beyond what's in the documentation or public information. 

[Gu Xuan]

Thank you for your reply.

I am university user.