solid-solid interdiffusion
 

Hello everyone,
my question concerns the possibility of calculating the interdiffusion (chemical diffusion) of at least two solids (Ni and Cu) at the interface at variable temperature.
The assumption is that we have bimetal (Cu and Ni) and we start to heat it. I am interested in calculating the phenomenon of interdiffusion of these elements.
I know that the theoretical foundations are based on Boltzmann's transformation of Fick's second law, but have no idea how to implement it.

Is it possible in CFX?

Would be grateful for any help.

This is best described by the Maxwell-Stefan equations for Multicomponent diffusion. Ni into Cu and Cu into Ni. Look for the book of Taylor and Krishna.
This is not covered in CFX. Maybe you can modify CFX to have it done what you want, but better write your own code.