[Shamoon Jamshed]

Originally Posted by mohammadkm

Dear dragos
you solved my problem, thank for your help.
As you said there is no need to write udf, i just used "/solve/set/expert".
After that i changed criteria of energy from 1e-6 to 1e-12 and my solution was validated.
thanks again

Hello Mohd. Km

Could you please tell me your paper and which paper you are validating your results from?

Regards,

[m.salih]

Originally Posted by pakk

There are two options:
- Fluent has a bug and calculates the square of the gradient of temperature wrong.
- You did something wrong when you tried to let Fluent calculate the square of the gradient of the temperature.

You seem to think that the second option is very unlikely. I think the first option is very unlikely.

Dear pakk, have you any idea about wrong entopy calculation? I have same problem now. The results of custom field function and excell calculations do not match, especially the square of gradient are different, do you have any advice? Thanks.

[m.salih]

Originally Posted by Ras0ul

Dear all
I entered the entropy generation equation in custom field function.but my result is wrong(not validated with paper). I examined my results and found that Fluent calculate the temperature gradient, but it can not properly calculate the square of the temperature gradient!!!
please help with this problem
thanks

Dear Ras0ul, have you solved your problem about wrong entopy calculation? I have same problem now. The results of custom field function and excell calculations do not match, especially the square of gradient are different, do you have any advice? Thanks