How to change the heat capacity and coefficient of thermal expansion?

Hello everyone.
I need help, I do not understand how I can change the thermal conductivity of a fluid and the coefficient of thermal expansion, for example, in the boussinesqThermal2d program.
These two parameters are not explicitly specified anywhere.
Please, tell me what should I use to be able to change these parameters. I have not found any information on this yet.
Thank you.

Hi, you could join the Discord Group Chat from Gitlab where some people may help/discuss.


Thank you, but where can i find link, on this Discord Chat?