Setting atmospheric, impermeable, and adiabatic boundary conditions

Hello,

I’m working on modeling the flow of CO2 and water into a hydrothermal system using EOS2. I want to set the top boundary to atmospheric conditions and the side and bottom boundaries to impermeable and adiabatic.

From what I understand so far, I’m setting the atmospheric boundary by making a separate material in the ROCKS block with the atmosphere parameters and then assigning that to the elements at the surface, plus making the volume of these elements very large (10^50).

However, I’m a bit more uncertain about setting up the impermeable and adiabatic boundary conditions. Would that be similar to the Dirichlet boundary conditions, so just setting the volume of the boundary to a very large number and also making the nodal distance very small (10^-9)? Or are there other things that need to be changed in order to achieve this boundary condition?

A follow-up question to this has to do with injecting and producing CO2 and water. If I’m trying to inject CO2 and water at the base of the model, do I make the injection element the same as the boundary or would I want to inject from an element just inside of the boundary?

Thanks for any help!

Karissa