How to obtain a temperature gradient directly from the solver for the UDF purposes? Does any macro exist to compute temperature gradient?

C_T_G(c,t)[i] -- cell_t c, Thread *t, int i : gives you temperature gradient component.

C_T_G(c,t) -- cell_t c, Thread *t : gives you temperature gradient vector.

Thanks very much for Your help!

You may need to be careful when using these macros depending upon what you are doing with them. They are not generally applicable for calculating gradients at faces - ie for flux calculations. As far as I can work out they return the gradients between neighbouring cells in the specified direction.

Greg

I just only want to check value of temperature gradient at my computational domain but when I use

C_UDMI(c,t,i)= C_T_G(c,t)[0];

my UDF is compiled correctly but Fluent send a SEGMENTATION VIOLATION error.

What could be a reason of that?

Did you define sufficient space for your udm's??

Yes, I defined u sufficient space for UDMI's...

My domain is axissymetric and I make:

C_UDMI(c,t,0) = C_T_G(c,t)[0] for axial direction C_UDMI(c,t,1) = C_T_G(c,t)[1] for radial direction

Is it correct?

hi i need to know the temperature gradient in the domain, i am using the using the udf... but i didnt know how to display the same, please do suggest me