
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/ms, is in units of Kelvin, is in units of Angstroms, and where
The LennardJones parameters , and , are inputs to the kinetic theory calculation that you supply by selecting kinetictheory from the dropdown list to the right of Viscosity in the Materials panel. The solver will use these kinetic theory inputs in Equation 8.49 to compute the fluid viscosity. See Section 8.13 for details about these inputs.