The user can control the viscosity information and the asperity contact information.
Figure 1 Additional Options for EHD Piston Lubrication dialog box
•Pressure-Visocity Coefficient [1/Pa]: The user can use the dynamic
viscosity as the function of pressure as shown in a following equation. When the
pressure-viscosity coefficient is not zero, the defined dynamic viscosity work
as the value measured in the atmosphere pressure, 
.
Eq.1 Equation of Pressure-Viscosity Relationship
•Asperity Contact Model: In the case of mixed lubrication region, the asperity contact force is added into the fluid pressure. For more information, click here.