[namandoshi]

Q1.can we define source term as user define function in cfx?if yes how?

Q2.i want to define udf for mass and energy source such that, mass source depend on mass of water vapour incoming the domain at point, is it possible to make such udf?

Q3. my energy source is dependent on the mass source.

[Opaque]

A1: Yes.

A2: Yes

A3: Yes

How? Depends on the complexity required. You may even be able to do it using CEL (CFX Expression Language) and not even write a single line of Fortran code.

You may need to review a few tutorials, and read the documentation for CEL expressions support. The UDF (User-defined Fortran) works via the expressions setup as well; therefore, time invested in CEL is worth it.