Liquid Wall Contact Law

Description

This frictional contact law implements a friction-style contact between liquid and the wall where contact shear is related to shear rate, viscosity, and a scaling factor to vary from stick to slip contact. It is only available in OSParticulas. When the surfaces are in contact, the frictional sliding force is

      [math]\displaystyle{ S_{slide} = k\ \eta(k\Delta v) \Delta v_t }[/math]

where k is a scaling factor (with units 1/length), [math]\displaystyle{ \eta(\dot\gamma) }[/math] is viscosity of a fluid (which may depend on shear rate), and [math]\displaystyle{ \Delta v_t }[/math] is the final difference in tangential velocities between fluid and the other material (usually a wall).

Properties

The properties for this law are:

Property	Description	Units	Default
coeff	The scaling factor k in the contact law	1/length units	2
liquidPhase	The liquid phase	none	-1