How to visualize water saturations in Paraview

[loaa4]

Dear professor,
I followed the example to visualize network in Paraview,I successfully visualized pores and throats,but when I try to visualize water saturation,I can't find 'water.pore.inv_seq' or properties like it.
The code of example is attached below.

import openpnm as op
%config InlineBackend.figure_formats = ['svg']
import numpy as np
import matplotlib.pyplot as plt

pn = op.network.Cubic(shape=[8, 8, 16], spacing=1)
pn['pore.coarse'] = True
pn['throat.coarse'] = True 
fig = op.topotools.plot_connections(pn)

np.random.seed(0)
Ps = pn.pores('coarse')
Ts = pn.throats(['coarse'])
geo1 = op.geometry.StickAndBall(network=pn, pores=Ps, throats=Ts)
fig = plt.hist(geo1['pore.diameter'], bins=25, 
               density=True, edgecolor='k', alpha=0.5)

water = op.phases.Water(network=pn)
phys1 = op.physics.Standard(network=pn, phase=water, geometry=geo1)
fig = plt.hist(np.log10(phys1['throat.hydraulic_conductance']), 
               bins=25, density=True, edgecolor='k', alpha=0.5)

sf_z = op.algorithms.StokesFlow(network=pn, phase=water)
Pin = 1.0
Pout = 0.0
sf_z.set_value_BC(pores=pn.pores(['top', 'coarse'], mode='and'), values=Pin)
sf_z.set_value_BC(pores=pn.pores(['bottom', 'coarse'], mode='and'), values=Pout)
sf_z.run()
fig = op.topotools.plot_coordinates(pn, color=sf_z['pore.pressure'], 
                                    size_by=pn['pore.diameter'], 
                                    markersize=50)

A = (8 * 1)**2
L = (16 * 1)
mu = np.mean(water['pore.viscosity'])
Q = sf_z.rate(pores=pn.pores(['top', 'coarse'], mode='and'), mode='group')
Kz = Q*L*mu/(A*(Pin - Pout))
print('The permeability coefficient is:', Kz)

op.io.VTK.export_data(phases=water,network=pn, filename='test_1')

Can you tell me where the problem is?Thanks a lot.

[jgostick]

The StokesFlow algorithm is a single-phase flow only, so the water is 'everywhere'. If you want a water configuration you need to run either InvasionPercolation or OrdinaryPercolation, to determine where the invasion phase will go, then you can apply StokesFlow only on the invading phase if you want to compute relative permeability.

We have a few related examples here:

https://github.com/PMEAL/OpenPNM/tree/dev/examples/simulations/percolation

[loaa4]

Thank you for your answer,it really helps a lot!