adif

    Air-water vapor diffusion. The air-water diffusion equation is given as Equation (21) of the “Models and Methods Summary” of the FEHM Application (Zyvoloski et al. 1999).

    • Group 1 - TORT
    Input Variable Format Description
    TORT real
    Tortuosity for air-water vapor diffusion.
    If TORT > 0, \(\tau\) of eqn 21, otherwise
    if TORT < 0, \(abs(\tau \phi S_v)\) of the same equation.
    If TORT > 1, water-vapor diffusion coefficient is set equal to the value
    specified for the first vapor species defined in the trac macro.

    The following is an example of adif. In this example the tortuosity (\(\tau\)) for vapor diffusion is specified to be 0.8.

    adif
    0.8

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