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-   -   UDF for temperature gradient (http://www.cfd-online.com/Forums/fluent-udf/115105-udf-temperature-gradient.html)

mariam.sara March 24, 2013 01:52

UDF for temperature gradient
 
I have wall i need to apply the current equation as boundary to it:

k*dT/dy=dT/dy

where k thermal conductivity
T local temperature

how i can add it please ? did i need a UDF for it?

vasava March 25, 2013 06:36

Yes you do need UDF. I think you could use the 'DEFINE PROFILE' macro.

mvee March 26, 2013 02:27

Hi

You need to use DEFINE_ADJUST function to set C_T_G as zero on the wall of your interest which is called using LOOK_UP_THREAD.

Best wishes.
Mvee

mariam.sara March 26, 2013 16:00

what did you mean with C_T_G? can you write me the term and post me it here?

Quote:

Originally Posted by mvee (Post 416390)
Hi

You need to use DEFINE_ADJUST function to set C_T_G as zero on the wall of your interest which is called using LOOK_UP_THREAD.

Best wishes.
Mvee


mvee March 28, 2013 00:02

C_T_G() - temperature gradient stored at cell locations. Please refer UDF manual.

amin_ghaemian February 16, 2016 16:13

C_T_G is used for compiling gradient over cells... but we need to calculate gradient over face thread!!!!!!!
so what we must to do???????

larry_lekwana February 25, 2016 08:03

Temporal temperature derivative mass transfer udf
 
Hi guys,

I am modelling a solid biomass combustion system using a transient, Eulerian multi-phase model in conjunction with a species transport model. I need to write a DEFINE_MASS_TRANSFER udf in order to determine the thermally driven rate of drying of the solid fuel. This requires the the determination of the time derivative of the particle temperature, which I do not know how to code. Please can someone help?

Thank you guys in advance for your assistance.


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