kmh435 wrote

Thank you very much for your response.

Just to clarify, there's no way to set the permeability and viscosity to zero in the y-direction either? While retaining hydraulic properties as a function of x and z of course.

Yes, you can redefine the permeability, viscosity, and equation to something like

dts_dl*p' - (kap_x/eta_x*px_x + kap_y/eta_y*py_y + kap_z/eta_z*pz_z) = F_dl

and assigning "kap_x_i/eta_x_i" using the coefficients dialog box. However setting "kap_y = 0" would be equivalent to removing the term altogether (which you already tried).