Hi all,

I have a udf wherein I impose a mass fraction gradient. Since at the first step the gradient is not defined, I placed a control like this:

if (NULL != THREAD_STORAGE(t,SV_Y_0_G))

dYfdy = C_YI_G(c,t,0)[1];

else

dYfdy = -0.1;

My problem is that THREAD_STORAGE(t,SV_Y_0_G) is ALWAYS equal to zero at every step (not only the first). And if I change my grid it seems to work.

Does anyone have idea why I have this problem?

Thanks guys, keep up the good work.

Luca

Try the following TUI commands

//define/models/species/save-gradients? : yes

and

//set/solver/expert "Keep temporary solver memory from beeing freed?" : yes

This should force the fluent solver to store the gradients you want.

RoM

Thanks a lot RoM, I soved my problem. Could you please tell me the commands to store the thermal gradients also?

Where can I find a list of TUI commands?

Thank you!

Luca

The //set/solver/expert "Keep temporary solver memory from beeing freed?" should take care of all available gradients including energy. I dont know why there is an extra command for the species gradients.

RoM