If you are using the gas law (as described in Section 8.3), you have the option to define the fluid viscosity using kinetic theory as
where is in units of kg/m-s, is in units of Kelvin, is in units of Angstroms, and where
The Lennard-Jones parameters , and , are inputs to the kinetic theory calculation that you supply by selecting kinetic-theory from the drop-down list to the right of Viscosity in the Materials panel. The solver will use these kinetic theory inputs in Equation 8.4-9 to compute the fluid viscosity. See Section 8.13 for details about these inputs.