Hi,

You can use either DEFINE_ON_DEMAND or DEFIN_EXECUTE_AT_END to calculate the Tavg. There is a good example in Fluent UDF Manual which calculates the max, min and average temperatures using DEFINE_ON_DEMAND. You might find it helpful,

cheers

Hi,

Thanks for swift response.

I more query reg the same. n case I have to calculate gradient in flow, say referring to example cited in question, say gradient of velocity at cell centre, which I suppose may be calculated using Taylor series first order expansion (I th cell velcotiy-I-1 th cell velocity)

However this may be true for uniform grid. In case of non-uniform grid, where I may not have each cell after each cell, how to proceed for the same.

Deewakar

Sharma

Hi,

You don't need to complicate too much. There are macros ready for you - use the C_U_G(c,t) , C_V_G(c,t) or C_W_G(c,t) macro to define the velocity gradient vector.

Good luck!

Matevz

Hi

Thanks for help.

May I know hoe to go for searching the requisite macros. Because the manual is so big to look for. Any short way out.

Thanks for help

Hi Matevz

I couldn't find the example you are mentioning. It would be really helpful if you may kindly mail me the pdf on [email protected]

What is process to write UDF for a wall whose temperature varries in 5 zone along the length(35 cm).

Please help I really need it

Sorry, but your question is not clear !!!!