Liquid Wall Contact Law

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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_t) \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 Enter the liquid phase material by ID (scripted files only) or by number none none

Note that this contact law uses the viscosity provided by the named liquidPhase property for all contact situations assigned that law. Simulations that use this contact law must therefore insure that it only applies to contact involving that liquid material by setting [or custom contact laws] as needed.