def METHOD_NAME(self):
    gd = self.phase["throat.diffusive_conductance.X"]
    self.phys["throat.Nt_by_2.X"] = np.vstack((gd, gd)).T
    mod = op.models.physics.ad_dif_mig_conductance.ad_dif_mig
    self.phys.add_model(propname='throat.ad_dif_mig_conductance_Nt_by_2',
                        model=mod, s_scheme='upwind', ion='X',
                        throat_diffusive_conductance="throat.Nt_by_2")
    gd_old = self.phys["throat.ad_dif_mig_conductance_upwind"]
    gd_new = self.phys["throat.ad_dif_mig_conductance_Nt_by_2"]
    # New conductance based on (Nt,2) dif_cond must match the old values
    assert_allclose(actual=gd_new, desired=gd_old, rtol=1e-5)