Subsurface Flow with Darcy´s Law in a saturated Grout Sample

Hey Everbody,

I have a problem with my hydrodynamic model in Comsol Multiphysics 5.1. I want to simulate the hydraulic conductivity in a saturated Grout sample, where a HD-PE Pipe is centered. I attach a simple picutre of the system.

My problem is, that the Darcy´s Law in comsol multiphysics, calculate the pressure and i have no idea what kind of boundary condition the pressure should be, which is predefined in the physics of Darcy´s Law.

I want to have the result, that the hydraulic conductivity is shown or can be calculated and the flow direction is shown as well.

If you are from Germany, you can answer in german, but in English is good as well.

Thanks in advance.

Kind Regards

Robin