Table II.

Relative errors in the effective diffusivity in percent defined as $100|D_{\mathit{eff}}^{sim}-D_{\mathit{eff}}^{theory}|/D_{\mathit{eff}}^{sim}$, where $D_{\mathit{eff}}^{sim}$ and $D_{\mathit{eff}}^{theory}$ are the effective diffusivities obtained from the simulations and given by Eq. (5.10), respectively.

b	0.05				0.1
${\overline{v}}_{\mathit{f}}$	5	10	15	20	5	10	15	20
a = l = R = 1	1.49	2.23	2.06	2.18	1.92	2.30	1.82	1.82
l = R = 1, a = 2	1.46	0.83	1.11	2.10	0.84	1.13	1.10	1.17
a = R = 1, l = 2	1.46	0.89	1.04	0.85	0.65	0.55	0.76	0.91
a = l = 1, R = 2	2.57	2.17	2.25	2.29	2.95	3.86	3.13	2.66