Hello,

I am trying to add a source term to the turbulent kinetic energy dissipation equation. Unfortunately there are some terms I don't know how to add.

For instance, is there any macro to get the velocity derivative in time? I know it is easy to create myself but I want it to depend on the time discretization scheme (I know, it is not that difficult).

Second of all, is there a direct macro for the turbulent production? It seems quite annoying having to play with the S tensors...

Thank you for your help!

I found a bigger problem: I cannot access the value of turbulent kinetic energy at the previous time step! Any ideas?

Thank you.