DIFFU

DIFFUSION (optional; needed only when accounting_for_diffusion is true) introduces diffusion coefficients.

Record DIFFU.1

Free format for 4 or less parameters, Format (4E10.4)

FDDIAG(I,1), I=1,NPH

diffusion coefficients for mass component # 1 in all phases (I=1: gas; I=2: aqueous; etc.)

Record DIFFU.2

Free format for 4 or less parameters, Format (4E10.4)

FDDIAG(I,2), I=1,NPH

diffusion coefficients for mass component # 2 in all phases (I=1: gas; I=2: aqueous; etc.)

Provide a total of NumCom records with diffusion coefficients for all NumCom mass components.

If the inputs are negative, the constant diffusivity formulation, $\tau_0 \tau_\beta=S_\beta$ will be used. Diffusivities will be taken to be the absolute values of the user inputs. See Section "Flux Terms" for details.

Used in: All EOS modules, except EOS9

Example: (gas, liq.)

DIFFU //diffusivity data for two phases, five mass components

1.e-6; 1.e-10 // use semicolon as separator is also allowed.

0.e-6, 0.e-6

1.e-6, 1.e-10

1.e-6, 1.e-10

1.e-6, 1.e-10