Hydraulic conductance for Stokes FLow

[marcosauermoser]

Hello!
I am trying to calculate the permeability of a pore network with the Stokes Flow algorithm, using cubic pores and cuboid throats.
I encountered now two questions regarding the hydraulic conductance:

1,) In the documentation I found basically two ways on how to set the hydraulic conductance. Either I set it in the physics object or add the hydraulic conductance model directly to the phase. Is there a preferred method I should use? Or does it not matter in the end?
water = op.phases.Water(network=pn)

phys_water = op.physics.GenericPhysics(network=pn, phase=water, geometry=geo)

phys_water['throat.hydraulic_size_factors'] = p.models.geometry.hydraulic_size_factors.cubes_and_cuboids(geo,pore_diameter='pore.diameter',
throat_diameter='throat.diameter', pore_aspect=[1, 1, 1], throat_aspect=[1, 1, 1])

In physics:
phys_water['throat.hydraulic_conductance'] = op.models.physics.hydraulic_conductance.generic_hydraulic(phys_water, pore_viscosity='pore.viscosity', throat_viscosity='throat.viscosity', size_factors='throat.hydraulic_size_factors')
In phase:
water.add_model(propname='throat.hydraulic_conductance', model=op.models.physics.hydraulic_conductance.generic_hydraulic)

2.) When using the Valvatne_Blunt (instead of the generic_hydraulic) method for the hydraulic conductance, I am missing the throat.shape_factor. (see error message below) and most likely also the pore.shape_factor i guess. In the documentation, however, I have only found the throat_capillary.shape_factor. Could anyone explain to me please, how I can set these two properties? Or is this the same as the throat_capillary.shape_factor?
water.add_model(propname='throat.hydraulic_conductance', model=op.models.physics.hydraulic_conductance.valvatne_blunt)

ERROR : throat.hydraulic_conductance was not run since the following property is missing: 'throat.shape_factor' SOURCE : openpnm.core.ModelsMixin._regen

Thank you very much for your help!

Kind regards,
Marco