I’m working on geological problem and I try to solve a gas transport across a soil.
To solve this problem, I want to modify the advection-diffusion equation and by the Fick law (diffusive transport) with porosity and permeability.
Also, I want to add the gas viscosity, and the pressure.
How can I perform?
(Moreover, do you know where I can find this file : h_transport_problem.F ?)