| r""" |
| Example: How to use OpenPNNM to simulating multiphase Fickian diffusion |
| |
| 1D network, the first half of the network is occupied by air and the next |
| half by water. A partition coefficient of 0.5 is assumed, meaning that the |
| concentration of the diffusing species in water "at the interface" is half |
| of that in air. |
| |
| """ |
| import openpnm as op |
| import matplotlib.pyplot as plt |
| import numpy as np |
| np.random.seed(10) |
|
|
| |
| net = op.network.Cubic(shape=[10, 1, 1]) |
| geom = op.geometry.SpheresAndCylinders(network=net, pores=net.Ps, throats=net.Ts) |
|
|
| |
| air = op.phase.Air(network=net, name="air") |
| water = op.phase.Water(network=net, name="water") |
| water["pore.diffusivity"] = air["pore.diffusivity"] * 0.2 |
|
|
| |
| mphase = op.contrib.MultiPhase(network=net, phases=[air, water]) |
| mphase._set_automatic_throat_occupancy() |
| mphase.set_occupancy(phase=air, pores=[0, 1, 2, 3, 4]) |
| mphase.set_occupancy(phase=water, pores=[5, 6, 7, 8, 9]) |
| const = op.models.misc.constant |
| mphase.set_binary_partition_coef(phases=[water, air], model=const, value=0.5) |
|
|
| |
| phys = op.physics.Standard(network=net, phase=mphase, geometry=geom) |
| mdiff = op.models.physics.diffusive_conductance.multiphase_diffusion |
| phys.add_model(propname="throat.diffusive_conductance", model=mdiff) |
|
|
| |
| fd = op.algorithms.FickianDiffusion(network=net, phase=mphase) |
| fd.set_value_BC(pores=0, values=1.0) |
| fd.set_value_BC(pores=9, values=0.1) |
| fd.run() |
|
|
| |
| c = fd["pore.concentration"] |
| plt.figure() |
| plt.plot(c, "ko:") |
| plt.xlabel("x (m)") |
| plt.ylabel("c (mol/m3)") |
|
|
